Authors:
Daniel A. Lopez The Frederick J. and Marion A. Schindler Cognitive Neurophysiology Laboratory, The Ernest J. Del Monte Institute for Neuroscience, Department of Neuroscience, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, USA
Division of Epidemiology, Department of Public Health Sciences, University of Rochester Medical Center, Rochester, NY 14642, USA
Department of Psychiatry, Oregon Health & Science University, Portland, OR 97239, USA

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John J. Foxe The Frederick J. and Marion A. Schindler Cognitive Neurophysiology Laboratory, The Ernest J. Del Monte Institute for Neuroscience, Department of Neuroscience, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, USA

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Edwin van Wijngaarden Division of Epidemiology, Department of Public Health Sciences, University of Rochester Medical Center, Rochester, NY 14642, USA

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Wesley K. Thompson Laureate Institute for Brain Research, Tulsa, OK 74136, USA

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Edward G. Freedman The Frederick J. and Marion A. Schindler Cognitive Neurophysiology Laboratory, The Ernest J. Del Monte Institute for Neuroscience, Department of Neuroscience, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, USA

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Open access

Abstract

Background and aims

Video games are a common form of entertainment in adolescents, which may result in gaming habits characterized by impairment to reward-related decision-making. The aim of the current study was to investigate the relationship between reward processing and symptoms of gaming addiction in adolescents.

Methods

Data from three consecutive follow-up years (years 2, 3 and 4) of the Adolescent Brain Cognitive Development (ABCD) Study were analyzed (n = 6,143, total observations = 12,745, mean age at year-2 = 12 years). Participants completed the Video Game Addiction Questionnaire (VGAQ) at each visit. Discrete stages of reward processing were measured at the year-2 visit using the Monetary Incentive Delay task while the participant completed a functional magnetic resonance imaging (fMRI) scan. Bayesian hierarchical linear models were employed to examine the longitudinal association between reward processing in regions of interest at year-2 and VGAQ scores over time.

Results

Lower activation in the bilateral caudate during the anticipation of a large reward (β = −0.87, 95% CI: −1.68, −0.07) was associated with greater VGAQ scores over time. This implies that for each one-unit increase in brain activity in the caudate, there was an associated 0.87-point decrease in symptoms of gaming addiction as measured by the VGAQ. No association was found between reward feedback and VGAQ scores.

Discussion and Conclusions

The findings suggest that abnormal reward processing in the caudate nucleus is associated with symptoms of gaming addiction in adolescents. These results provide a clearer understanding of the brain mechanisms involved in gaming addiction, which could inform future preventive and therapeutic strategies.

Abstract

Background and aims

Video games are a common form of entertainment in adolescents, which may result in gaming habits characterized by impairment to reward-related decision-making. The aim of the current study was to investigate the relationship between reward processing and symptoms of gaming addiction in adolescents.

Methods

Data from three consecutive follow-up years (years 2, 3 and 4) of the Adolescent Brain Cognitive Development (ABCD) Study were analyzed (n = 6,143, total observations = 12,745, mean age at year-2 = 12 years). Participants completed the Video Game Addiction Questionnaire (VGAQ) at each visit. Discrete stages of reward processing were measured at the year-2 visit using the Monetary Incentive Delay task while the participant completed a functional magnetic resonance imaging (fMRI) scan. Bayesian hierarchical linear models were employed to examine the longitudinal association between reward processing in regions of interest at year-2 and VGAQ scores over time.

Results

Lower activation in the bilateral caudate during the anticipation of a large reward (β = −0.87, 95% CI: −1.68, −0.07) was associated with greater VGAQ scores over time. This implies that for each one-unit increase in brain activity in the caudate, there was an associated 0.87-point decrease in symptoms of gaming addiction as measured by the VGAQ. No association was found between reward feedback and VGAQ scores.

Discussion and Conclusions

The findings suggest that abnormal reward processing in the caudate nucleus is associated with symptoms of gaming addiction in adolescents. These results provide a clearer understanding of the brain mechanisms involved in gaming addiction, which could inform future preventive and therapeutic strategies.

Introduction

Background

Video game use is a common form of entertainment that can sometimes develop into a problematic condition. According to recent surveys, an estimated 71% of Americans under 18 play video games, typically about 13 h per week (Entertainment Software Association, 2022). While video games can offer small cognitive performance benefits in adolescents (Bader Chaarani et al., 2022), for some individuals, gaming can become problematic.

Problematic gaming behaviors are characterized by adverse effects on social and functional well-being, often referred to as gaming addiction (Petry & O'Brien, 2013). These negative consequences are particularly pronounced in children and adolescents, and include social isolation, poor academic outcomes, and emotional and behavioral issues (Gentile et al., 2011; Jeong & Kim, 2011; Lemmens, Valkenburg, & Peter, 2011). Notably, studies have found significant correlations between gaming and higher levels of depression and ADHD symptomatology (Bader Chaarani et al., 2022). The condition has garnered increasing attention in recent years. In 2013, the Diagnostic and Statistical Manual of Mental Disorders (DSM-5) included Internet Gaming Disorder as a condition requiring further research (American Psychiatric Association & American Psychiatric Association, 2013). Subsequently, in 2018, the International Classification of Diseases (ICD-11) included Gaming Disorder as a recognized disorder characterized by impaired control over gaming, prioritization of gaming over other activities, and continuation or escalation of gaming despite negative consequences (World Health Organization, 2019/2021). Recent studies estimate that around 3% of the global population has gaming disorder, with higher prevalence rates in males and adolescents (Stevens, Dorstyn, Delfabbro, & King, 2020).

To date, neural research into gaming addiction has focused almost entirely on adult populations (Weinstein & Lejoyeux, 2020). However, adolescents may be particularly vulnerable to addiction due to greater reward-seeking and risk-taking behaviors, which can persist into adulthood (Bava & Tapert, 2010; Nora D Volkow & Wargo, 2022). Whether abnormal reward processing is associated with gaming problems in adolescents is less clear.

Neuroimaging studies implicate several brain regions involved in gaming addiction and different aspects of reward processing. The striatum is at the center of the brain network involved in reward evaluation, and is comprised of the nucleus accumbens (NAcc), the caudate nucleus, and the putamen (Cai et al., 2016; Haber, 2011). The NAcc is essential for the processing of rewards and influences the emotional and motivational aspects of reward processing (Haber & Knutson, 2010). The caudate nucleus is heavily involved in higher cognitive functions related to decision-making, reward-related learning, and neural activity related to reward anticipation (Grahn, Parkinson, & Owen, 2008; Haber & Knutson, 2010; Watanabe & Hikosaka, 2005). The pallidum is involved in reward encoding, motivational signaling, and proper valuation of reward outcomes (Haber, 2011; Ottenheimer, Richard, & Janak, 2018; Richard, Ambroggi, Janak, & Fields, 2016; Smith, Tindell, Aldridge, & Berridge, 2009).

Functional magnetic resonance imaging (fMRI) studies report abnormal brain activity in the striatum of adolescents and young adults with gaming addiction. For example, a study examining the correlates of gaming frequency and brain activity in adolescents reported significant neural differences between frequent and infrequent gamers (Kühn et al., 2011). Frequent gamers showed enhanced striatal activity during loss feedback in the Monetary Incentive Delay (MID) task, paralleling dopamine increases seen in pathological gamblers during losses (Kühn et al., 2011). Another study found that frequent online gamers had significantly less activation in the ventral striatum during the anticipation of large rewards when compared to non-gamers, suggesting a deficiency in the reward network (Hahn et al., 2014).

Information from the NAcc and pallidum travels to the dorsal anterior cingulate cortex (dACC) and parts of the prefrontal cortex like the orbitofrontal cortex (OFC), which are associated with evaluating reward value and outcomes (Haber, 2011). The dACC plays a role in reward monitoring and assessment of gains and losses (Heilbronner & Hayden, 2016). The OFC is important for valuing real and imaginary future rewards, with the medial OFC responding to reward outcomes and the lateral OFC coding for negative reinforcement (Bray, Shimojo, & O'Doherty, 2010; Noonan, Mars, & Rushworth, 2011; Peters & Büchel, 2010). Abnormal prefrontal cortex activity has been linked to gaming addiction risk, indicating greater risk-taking tendencies and reduced loss aversion in adolescents with gaming addiction (Qi et al., 2016).

The amygdala is closely linked to emotional processing and reward evaluation, and recent studies have found that the amygdala is reliably activated by both primary (e.g., food) and secondary (e.g., money) rewards irrespective of loss (Sescousse, Caldú, Segura, & Dreher, 2013; Yacubian et al., 2006). Likewise, the insula appears to be involved in the subjective affective experience of rewards, and may also be strongly activated when an individual is faced with a potential loss (Sescousse et al., 2013). A systematic review of the neurobiology of impulsivity found that abnormalities in the amygdala and insula in individuals with Internet Gaming Disorder may indicate a problematic regulation of negative emotions (Li, Turel, & He, 2023). In addition, a study of young adults reported significantly higher functional connectivity with the left amygdala over the right insula and the right amygdala with the left insula in those with Internet Gaming Disorder (Ko et al., 2015).

Overall, the brain regions involved in the reward network are interrelated and perform overlapping functions, making it crucial to examine multiple brain regions associated with reward processing to identify specific contributions to gaming addiction. By identifying the distinct roles that different brain regions play in reward processing, future studies can better target these areas to develop more precise neurobiological models of gaming addiction and lead to more accurate identification of individuals at risk for developing a gaming problem. Moreover, this understanding might also contribute to public health initiatives aimed at promoting healthy gaming behaviors.

Study aims

The generalizability of current research into gaming addiction is limited by small sample sizes and a relative lack of longitudinal studies, limiting our understanding of how this may manifest into later life addictive behaviors. Most neuroimaging studies on gaming addiction focus on the reaction to gains rather than losses, making it difficult to fully characterize reward processing at different stages of decision-making (Y. W. Yao, Zhang, Fang, Liu, & Potenza, 2022). Furthermore, to comprehensively understand gaming addiction, it is essential to consider various factors that may influence gaming behaviors, such as age, sex, socioeconomic status, and environmental influences. These factors can impact the development and severity of gaming addiction and must be accounted for in research to accurately assess their relationships with gaming behaviors.

Here, we examined the relationship between neural activity during the anticipation and feedback of monetary rewards and monetary losses and longitudinal symptoms of gaming addiction. We used task-fMRI data from the Monetary Incentive Delay (MID) task at the year-2 visit of the Adolescent Brain Cognitive DevelopmentSM (ABCD) Study. Outcome measures included gaming addiction scores collected using the Video Game Addiction Questionnaire (VGAQ) at the year-2 (mean age = 12 years), year-3 (mean age = 12.9 years), and year-4 (mean age = 14 years) study visit. We hypothesize that decreased brain activity in key reward processing regions during the anticipation phase of the MID task will be strongly associated with greater VGAQ scores over time. We further hypothesize that an increase in brain activity in reward processing regions during the feedback phase of the MID task will be strongly associated with greater VGAQ scores. The current study was completed using data from the ABCD Study© 5.1 data release (http://dx.doi.org/10.15154/z563-zd24).

Methods

Participants

The ABCD Study is a prospective cohort study that enrolled 11,878 children aged 9–10 at 21 currently active research sites in the United States (Nora D. Volkow et al., 2018). This ongoing study will follow participants until they are approximately 19–20 years old (Garavan et al., 2018). The study aims to characterize the psychological and neurobiological development of pre-adolescents into young adulthood (Garavan et al., 2018). The ABCD Study protocol includes a biennial magnetic resonance imaging (MRI) scan (Casey et al., 2018; Garavan et al., 2018). Adolescents, along with a participating caregiver, also completed a series of sociodemographic and other questionnaires at each study visit (Barch et al., 2018).

The current longitudinal analysis included adolescents that attended the year-2, year-3, or year-4 visit. Data used in the analysis was collected between approximately July 2018 and January 2022 (age range 10–15). Previous study visits were excluded due to absence of measures related to video game addiction (i.e., the VGAQ was not collected prior to the year-2 visit). Children that failed the task-fMRI quality control or were missing the VGAQ measure were also excluded from these analyses. The final analytic sample included 12,745 observations from 6,143 children.

Measures

The Video Game Addiction Questionnaire

The VGAQ is a 6-item questionnaire on a 6-point Likert scale (0 = Never, 1 = Very Rarely, 2 = Rarely, 3 = Sometimes, 4 = Often, 5 = Very Often) (Fig. S1 in Supplementary Materials) (Bagot et al., 2022). Psychometric findings support the validity of the VGAQ in the measurement of video game addiction in adolescents (Bagot et al., 2022). The VGAQ was completed by participants that reported playing video games (i.e., the VGAQ was skipped if a child reported not playing any single-player or online multiplayer video games during a typical week). There are no current recommendations on what constitutes a cut-off for problematic gaming using the VGAQ. For the current analyses, the VGAQ scores were calculated for participants using the sum of all responses. Creation of a summary score from Likert-type items is recommended when there are five or more categorical levels and there is strong internal consistency reliability (VGAQ McDonald's ω at year-2 = 0.86, year-3 = 0.87, year-4 = 0.87) (Bagot et al., 2022; Johnson & Creech, 1983; Rickards, Magee, & Artino Jr, 2012; Sullivan & Artino, 2013). VGAQ scores ranged from 0 to 30, with higher scores indicating greater symptoms of gaming addiction.

Imaging measures

The Monetary Incentive Delay (MID) task measures neural activity related to the anticipation and receipt (i.e., feedback) of rewards and losses (Casey et al., 2018; Knutson, Westdorp, Kaiser, & Hommer, 2000). The ABCD version of the MID task included 10 possible contrasts (Fig. S2 in Supplementary Materials) intended to characterize general reward processing. As part of the task, participants were presented with an incentive cue consisting of five trial types: win money ($0.20 or $5), lose money (−$0.20 or −$5), or no incentive ($0) (Fig. 1) (Knutson et al., 2000). Task-related activity was localized by subtracting the neutral condition from a positive or negative condition (e.g., winning $5). Participants were shown a cue (pink circle, yellow square, or blue triangle) at the beginning of each trial that indicated the trial type (win, loss, no incentive) and amount at stake (Casey et al., 2018). Participants then had to press a button as soon as the target was shown on screen. The trial was lost if the participant did not press the button within a certain time limit. A feedback message informed the participant of the trial outcome. Importantly, the task motivated participants by providing real monetary incentives related to performance (Casey et al., 2018). Participants were paid an average of $21 for their performance on the MID task (Casey et al., 2018). The MID task was designed to ensure a success rate near 60% for all win money trials (Casey et al., 2018). A total of 2 runs with 50 trials each (10 per trial type) were completed by participants (B Chaarani et al., 2021). In total, there were 40 reward and loss trials and 20 neutral trials included in the anticipation phase. The feedback phase included approximately 24 positive feedback and 16 negative feedback trials per run (Casey et al., 2018). The MID task duration was 5 min and 42 s per run (Casey et al., 2018).

Fig. 1.
Fig. 1.

Each trial of the MID task begins with an incentive cue (2,000 ms) of five possible trial types (Win $.20, Win $5, lose $.20, Lose $5, $0). The incentive cue represents the anticipation phase. This is followed by a jitter anticipation event (1,500–4,000 ms). Next, a variable target (150–500 ms) appears prompting the participant to respond as quickly as possible to either win money or avoid losing money. The target event is followed by a feedback message informing the participant of the trial outcome. Figure recreated from Casey, 2018; Casey et al., 2018). Figure created using Biorender

Citation: Journal of Behavioral Addictions 13, 4; 10.1556/2006.2024.00068

Image processing

Image processing and estimation of activity in regions-of-interest (ROIs) was done by the ABCD Data Analysis, Informatics & Resource Center (DAIRC). Details of the processing and curation of imaging data have been previously published (Hagler et al., 2019). Briefly, cortical and subcortical surface-based values for ROIs were generated using the FreeSurfer brain imaging software package (Hagler et al., 2019). Individual subject level brain activity related to the MID task (e.g., contrast of brain activity in a ROI during a large reward anticipation trial versus a no incentive trial) was calculated using a general linear model (Hagler et al., 2019). The resulting output included contrast beta weights that represent the weighted average across two runs for each participant. In our analyses, consistent with previous ABCD analyses of behavioral outcomes, the contrast beta weights were the exposure of interest used to examine reward processing (Hawes et al., 2021). The current study focused on four separate contrasts: anticipation of a large reward versus anticipation of no loss or reward, anticipation of a large loss versus anticipation of no loss or reward, large and small reward with positive feedback versus large and small reward with negative feedback, and large and small loss with positive feedback versus large and small loss with negative feedback (Fig. S3 in Supplementary Materials).

Neuroimaging data exclusion

The DAIRC excluded imaging data that failed the quality control (QC) process at the year 2 visit (Fig. S4 in Supplementary Materials) (Hagler et al., 2019). In addition, we excluded participant imaging data if they were not recommended for inclusion due to task-specific quality control issues (imgincl_mid_include = 0) (Hagler et al., 2019). The task-specific exclusion criteria included the following recommendations: 1) fewer than 1 MID series that passed QC (iqc_mid_ok_ser = 0), 2) unacceptable performance for feedback analyses (tfmri_mid_beh_performflag = 0), and 3) fewer than 200 degrees of freedom (tfmri_mid_all_b_dof < 200). More information on the variables can be obtained on the ABCD Wiki (https://wiki.abcdstudy.org/) and ABCD Data Dictionary (https://data-dict.abcdstudy.org/).

Covariates

The main effects of the following variables were considered as covariates: age of the child, sex at birth, parent-reported race/ethnicity of the child, household income, youth-reported neighborhood safety, youth-reported parental monitoring scores, parent-reported ADHD Kiddie Schedule for Affective Disorders and Schizophrenia for DSM-5 (KSADS-COMP) diagnosis, and symptoms of anxiety or depression. Sex at birth was included due to the increased risk of problematic gaming habits in males (Chen, Oliffe, & Kelly, 2018). Parent-reported race/ethnicity of the child was included due to greater frequency of media use in minority children (Carson, B, Chen, & Alegria, 2012). Household demographics (e.g., household income, parent educational attainment) were considered potential confounders due to their strong correlation with problematic gaming habits in the gaming literature (Nagata, Singh, et al., 2022). Household income was coded as a categorical variable with the following levels: <$50,000, $50,000 to <$100,000, ≥$100,000, Do Not Know, Refuse to Answer. ADHD diagnosis was considered for adjustment due to the link with excessive and problematic gaming (Weiss, Baer, Allan, Saran, & Schibuk, 2011). Presence of ADHD (1 = Yes, 0 = No) was measured using the parent-report on the KSADS-COMP (Townsend et al., 2020). Parental monitoring and neighborhood safety were included as potential confounders due to their strong correlation with gaming problems (i.e., greater parental monitoring and neighborhood safety is associated with decreased problematic gaming habits) (Ding, Li, Zhou, Dong, & Luo, 2017; Nagata, Singh, et al., 2022). Symptoms of anxiety or depression were not included in the final model due to possibly being on the causal pathway between ROIs and gaming outcomes (Männikkö, Ruotsalainen, Miettunen, Pontes, & Kääriäinen, 2017). Covariates that were plausible confounders and improved the model fit were considered for adjustment. Models were compared using leave-one-out (LOO) cross-validation information criterion. Model comparison using LOO values is considered a robust Bayesian alternative to comparable fit criterion (e.g., Akaike information criterion) (Vehtari, Gelman, & Gabry, 2017).

Statistical analysis

Bayesian hierarchical linear models were used to examine the association between beta-weights extracted from ROIs during the MID task at the year-2 visit and VGAQ scores over time. The primary outcome measure was the child's total VGAQ score at the year-2, year-3, and year-4 visits (i.e., a time-variant measure). The bilateral ROIs included the caudate nucleus, dorsal anterior cingulate cortex (DACC), insula, lateral orbitofrontal cortex (LOFC), medial orbitofrontal cortex (MOFC), nucleus accumbens (NAcc), pallidum, putamen, and amygdala. Results of the Bayesian hierarchical linear models were expressed as beta coefficients and 95% Bayesian posterior credible intervals (CI). Evidence of an association was defined as any CI that did not include the null value (i.e., excluded a beta coefficient = 0). The models included a nested random effects structure that accounted for clustering of participants within family units (Dick et al., 2020). A centered time variable (interview age) was included as a fixed and random slope term to account for correlated and heteroscedastic residuals over time within person (Singer & Willett, 2003). We utilized four separate hierarchical linear models to investigate the relationship between brain activity and symptoms of gaming addiction. Each model represented a different experimental condition: anticipation of a large reward ($5) versus neutral ($0), anticipation of a large loss ($5) versus neutral ($0), reward positive versus negative feedback, and loss positive versus negative feedback. Each model included only the beta weights representing the average ROI activity during that specific condition (e.g., all beta weights related to ROI activity during large reward anticipation). This approach allowed us to isolate the effects of brain activity during each condition on the trajectory of gaming addiction symptoms over time.

Bayesian hierarchical modeling reduces the risk of a false “statistically significant” finding by incorporating partial pooling of information across groups (e.g., family units) and conditions (e.g., large reward anticipation) (Gelman, Hill, & Yajima, 2012). The partial pooling, along with the inclusion of random effects in the model, results in estimates that are more regularized compared to traditional frequentist approaches (Gelman et al., 2012). Additionally, Bayesian hierarchical modeling accounts for multiplicity by integrating prior information and uncertainty into the analysis, providing a robust framework for inference. Weakly informative priors were specified for the fixed and random effects to allow the results to be primarily driven by the data, while still benefiting from the regularizing influence of the priors. All analyses were conducted using Bayesian inference methods with the brms package in R (Bürkner, 2017; R. Team, 2019; R. C. Team, 2013). Tables were created using the tableone package in R (Yoshida, Bohn, & Yoshida, 2020). Data wrangling was conducted using the tidyverse package in R (Wickham et al., 2019). Statistical analyses were performed using R version 4.2.2 and R Studio version 2023.06.1 (R. Team, 2019; R. C. Team, 2013). Code for the replication of current study results can be obtained on GitHub: https://github.com/Daniel-Adan-Lopez/ABCD_Gaming.

Ethics

This work has been conducted in accordance with the tenets of the Declaration of Helsinki and with approval from the ethics review board at the University of Rochester School of Medicine and Dentistry. Parental consent and child assent were obtained at each ABCD Study visit (Garavan et al., 2018). Caregiver consent and child assent were approved by the Institutional Review Board at each ABCD study site.

Results

Demographic characteristics of the sample

The analytic sample included 6,143 adolescents (12,745 observations) that attended the year-2, year-3, or year-4 visit and did not have missing data (Table 1). Missing data was minimal for non-imaging predictor variables (64 observations or 0.5% of the sample). The mean age of children included in the sample ranged from 12 to 14 across the three timepoints. Most children were male, White, and had a parent with a college degree. Around 5–6% of children had a present diagnosis of ADHD at each study visit.

Table 1.

Analytic sample demographics at each ABCD study visit

Year-2 (n = 4,818)Year-3 (n = 5,245)Year-4 (n = 2,682)
Age of child (months(SD))143.6 (7.9)154.5 (7.7)168.4 (8.1)
Child sex at birth
 Male2,959 (61.4)3,213 (61.3)1,664 (62.0)
 Female1,859 (38.6)2,032 (38.7)1,018 (38.0)
Race/ethnicity of child
 Asian78 (1.6)88 (1.7)49 (1.8)
 Black657 (13.6)626 (11.9)296 (11.0)
 Hispanic916 (19.0)990 (18.9)570 (21.3)
 White2,671 (55.4)2,999 (57.2)1,510 (56.3)
 Other496 (10.3)542 (10.3)257 (9.6)
Household Income ($)
 <50,0001,254 (26.0)1,283 (24.5)694 (25.9)
 50,000 to <100,0001,364 (28.3)1,483 (28.3)773 (28.8)
 ≥100,0001,831 (38.0)2,102 (40.1)1,016 (37.9)
 Do not know190 (3.9)189 (3.6)102 (3.8)
 Refuse to answer179 (3.7)188 (3.6)97 (3.6)
Household Educational Attainment
 < HS Diploma294 (6.1)291 (5.5)152 (5.7)
 HS Diploma/GED470 (9.8)456 (8.7)242 (9.0)
 Some College1,467 (30.4)1,562 (29.8)816 (30.4)
 Bachelor1,405 (29.2)1,568 (29.9)799 (29.8)
 Post Graduate Degree1,176 (24.4)1,360 (25.9)668 (24.9)
Neighborhood Safety
 Strongly Disagree115 (2.4)118 (2.2)58 (2.2)
 Disagree239 (5.0)249 (4.7)117 (4.4)
 Neutral915 (19.0)967 (18.4)513 (19.1)
 Agree1,581 (32.8)1,707 (32.5)875 (32.6)
 Strongly Agree1,968 (40.8)2,204 (42.0)1,119 (41.7)
KSADS ADHD Diagnosis (Present)
 Yes284 (5.9)289 (5.5)142 (5.3)
 No4,534 (94.1)4,956 (94.5)2,540 (94.7)
Parental Monitoring (mean(SD))4.46 (0.47)4.36 (0.50)4.39 (0.48)
VGAQ score6.33 (6.19)7.02 (6.39)6.77 (6.24)

Note: Distributions are presented as n (%), except where noted.

SD = Standard Deviation.

KSADS = Kiddie Schedule for Affective Disorders and Schizophrenia.

VGAQ = Video Game Addiction Questionnaire.

Participants excluded due to poor data quality during the MID task at the year-2 visit were more likely to be older, from a minority group, and from a household with less than some college educational attainment (Table S1 in Supplementary Materials). There was no significant difference in the year-2 VGAQ score of included and excluded participants (p = 0.07). Participants excluded due to missing VGAQ data (i.e., reported not playing any video games) were more likely to be female, White, from households with a postgraduate degree, and from households with incomes ≥ $100,000 (Table S2 in Supplementary Materials).

Video Game Addiction Questionnaire

The mean VGAQ score at the three timepoints was 6.3, 7.0, and 6.8, respectively (range = 0–30). Approximately 19.3% of the analytic sample had a VGAQ score of 0. A histogram of the distribution at each study visit is included in the supplementary materials (Fig. S5 in Supplementary Materials). The distribution of responses for individual items found that a substantial portion of participants reported low-frequency gaming behaviors (Table S3 in Supplementary Materials). The most endorsed items were ‘ I spend a lot of time thinking about playing video games’ and ‘I play video games so I can forget about my problems,’ but even these items had a considerable number of ‘never,’ ‘very rarely,’ and ‘rarely’ responses. VGAQ scores were greater in males, non-White children, and children from lower income households (Table 2). Children with and without a present diagnosis of ADHD had a mean VGAQ score of 8.5 and 6.3 at the year-2 visit, respectively. Children that strongly disagreed or disagreed that their neighborhood was safe from crime had a mean VGAQ score of 9.6 and 8.5 at the year-2 visit.

Table 2.

Distribution of covariates and VGAQ score in the ABCD Study

Video Game Addiction Score at year-2 (n = 4,818)Video Game Addiction Score at year-3 (n = 5,245)Video Game Addiction Score at year-4 (n = 2,682)
Child sex at birth
 Male8.2 (6.5)8.8 (6.4)8.2 (6.2)
 Female3.8 (5.1)4.6 (5.6)4.8 (5.8)
Race/ethnicity of child
 Asian6.4 (6.1)7.4 (6.1)8.1 (6.0)
 Black8.0 (7.4)8.3 (7.5)7.1 (7.1)
 Hispanic7.1 (6.6)8.1 (6.8)7.6 (6.7)
 White5.7 (5.7)6.4 (5.9)6.4 (5.8)
 Other6.8 (6.6)7.2 (6.5)7.4 (6.7)
Household Income ($)
 <50,0007.8 (7.2)8.3 (7.2)7.8 (6.9)
 50,000 to <100,0006.4 (6.2)7.1 (6.3)6.7 (6.2)
 ≥100,0005.4 (5.5)6.3 (5.8)6.3 (5.8)
 Do not know7.4 (6.8)8.2 (7.0)7.3 (6.1)
 Refuse to answer6.9 (6.6)7.2 (6.4)7.2 (6.4)
Household Educational Attainment
 < HS Diploma7.8 (7.1)7.9 (7.3)6.8 (6.3)
 HS Diploma/GED7.8 (7.0)8.2 (7.2)7.8 (6.8)
 Some College7.1 (6.8)7.8 (6.8)7.3 (6.5)
 Bachelor5.8 (5.9)6.5 (6.0)6.6 (6.1)
 Post Graduate Degree5.5 (5.6)6.4 (5.8)6.3 (5.8)
Neighborhood Safety
 Strongly Disagree9.6 (8.0)9.3 (7.5)8.8 (7.4)
 Disagree8.5 (7.6)8.1 (7.2)7.4 (6.4)
 Neutral7.4 (6.6)7.9 (6.7)7.6 (6.4)
 Agree6.3 (6.0)7.2 (6.3)6.9 (6.4)
 Strongly Agree5.8 (6.0)6.4 (6.3)6.3 (5.8)
KSADS ADHD Diagnosis (Present)
 Yes8.5 (6.9)9.0 (6.7)9.7 (6.9)
 No6.2 (6.1)6.9 (6.4)6.6 (6.2)

Note: Distributions are represented as mean (SD) unless otherwise noted.

Associations between large reward anticipation and VGAQ scores

The fully adjusted models found an inverse association between large reward anticipation and VGAQ score in the bilateral caudate (Table 3). Holding other variables constant, a one-unit increase in the anticipation of a large reward versus neutral condition in the bilateral caudate was associated with a 0.87-point decrease in VGAQ score (β = −0.87, 95% CI: −1.68, −0.07). There were no other ROIs associated with VGAQ scores in the large reward anticipation condition.

Table 3.

Association between reward anticipation and VGAQ score

Anticipation of Large Reward vs. NeutralAnticipation of Large Loss vs. Neutral
VGAQ Score (n = 6,143)VGAQ Score (n = 6,143)
β (95% CI)β (95% CI)
Bilateral
 Amygdala−0.5 (−1.05, 0.6)−0.49 (−1.08, 0.1)
 Caudate−0.87 (1.68,0.07)−0.64 (−1.47, 0.21)
 Dorsal ACC−0.12 (−1.03, 0.81)0.34 (−0.6, 1.29)
 Insula0.13 (−0.94, 1.19)−0.0 (−1.13, 1.11)
 LOFC0.34 (−0.25, 0.94)0.48 (−0.13, 1.09)
 MOFC0.03 (−0.32, 0.39)−0.03 (−0.38, 0.32)
 NACC0.42 (−0.01, 0.86)0.04 (−0.43, 0.5)
 Pallidum0.1 (−0.69, 0.9)0.06 (−0.77, 0.9)
 Putamen0.09 (−0.98, 1.12)−0.3 (−1.35, 0.73)

Note: ACC = Anterior Cingulate Cortex, LOFC = Lateral Orbitofrontal Cortex, NACC = Nucleus Accumbens, MOFC = Medial Orbitofrontal Cortex, VGAQ = Video Game Addiction Questionnaire.

Note: All models are adjusted for age, sex, race/ethnicity, household education, household income, neighborhood safety, parental monitoring, KSAD ADHD diagnosis, and study site.

Bold = Credible interval excludes the null value of 0.

Associations between large loss anticipation and VGAQ scores

The fully adjusted models did not find an association between ROIs during the large loss anticipation condition and VGAQ scores over time.

Associations between reward feedback and VGAQ scores

The models did not find evidence of an association between reward positive feedback or loss positive feedback and VGAQ scores over time (Table 4).

Table 4.

Association between reward feedback and VGAQ score

Reward Positive vs. Negative FeedbackLoss Positive vs. Negative Feedback
VGAQ Score (n = 6,143)VGAQ Score (n = 6,143)
β (95% CI)β (95% CI)
Bilateral
 Amygdala0.26 (−0.3, 0.8)−0.03 (−0.53, 0.46)
 Caudate−0.04 (−0.85, 0.77)−0.42 (−1.2, 0.39)
 Dorsal ACC0.23 (−0.67, 1.1)−0.03 (−0.91, 0.85)
 Insula0.71 (−0.34, 1.78)−0.01 (−1.03, 1.01)
 LOFC0.02 (−0.54, 0.56)0.2 (−0.35, 0.76)
 MOFC0.06 (−0.28, 0.4)0.24 (−0.09, 0.58)
 NACC0.12 (−0.28, 0.53)0.11 (−0.3, 0.52)
 Pallidum0.26 (−0.5, 1.0)0.33 (−0.45, 1.12)
 Putamen−0.87 (−1.85, 0.14)−0.17 (−1.12, 0.78)

Note: ACC = Anterior Cingulate Cortex, LOFC = Lateral Orbitofrontal Cortex, NACC = Nucleus Accumbens, MOFC = Medial Orbitofrontal Cortex, VGAQ = Video Game Addiction Questionnaire.

Note: All models are adjusted for age, sex, race/ethnicity, household education, household income, neighborhood safety, parental monitoring, KSAD ADHD diagnosis, and study site.

Bold = Credible interval excludes the null value of 0.

Discussion and conclusions

The current study examined the longitudinal association between anticipatory-feedback phase contrasts and symptoms of gaming addiction in a large sample of adolescents. We found that an increased response in the bilateral caudate during the anticipation of a large reward was associated with decreased VGAQ scores over time. The feedback phase of reward processing did not predict VGAQ scores in the analytic sample. These findings highlight the role of the caudate nucleus in gaming addiction.

The caudate and symptoms of gaming addiction

Our results indicate that blunted activity in the caudate nucleus is associated with greater symptoms of gaming addiction over time. This finding is consistent with literature suggesting that abnormal striatal functioning during the anticipation of rewards is linked to addiction risk (Balodis & Potenza, 2015; Y.-W. Yao et al., 2020). For example, a study measuring dopamine receptors in young adults with (n = 5) and without (n = 7) Internet addiction found an inverse association between Internet addiction severity and dopamine receptors in the left dorsal caudate, and significantly fewer dopamine receptors in the bilateral caudate of participants with Internet addiction (Kim et al., 2011). Another study found that the volume of the right caudate and right nucleus accumbens was significantly greater in 27 persons (mean age = 17.9) with Internet Gaming Disorder compared to 30 healthy controls (mean age = 18.3) (Cai et al., 2016). These results support our observation that reduced caudate activation correlates with higher gaming addiction symptoms, suggesting that a blunted reward response in this region may contribute to problematic gaming behaviors.

Conversely, some studies have reported increased caudate activation in addicted gamers during reward processing. For instance, a study with young adults found exaggerated brain activity in the caudate during reward anticipation in individuals with gaming addiction (Wang et al., 2021). Another study found increased activity in the caudate when young adult participants with a gaming addiction viewed gaming-related pictures (Ko et al., 2009). Differences from our findings may be attributed to the specific tasks used in these studies, which could highlight the diminished sensitivity to non-gaming related rewards in participants with symptoms of gaming addiction.

Protective role of caudate activation

Higher activation in the caudate nucleus during the anticipation of a large reward may serve as a protective factor against gaming addiction. The caudate is a fundamental contributor to successful goal-directed action due to its connectivity with higher level cognitive areas, such as the dorsolateral prefrontal cortex (Grahn et al., 2008). Lower activation may indicate that the brain's reward system has become less responsive to standard rewards in certain gamers. A study using the MID task to examine neural responses in addicted (n = 22, mean age = 22.3) and non-addicted gamers (n = 27, mean age = 22) reported blunted caudate activity in the former (Y.-W. Yao et al., 2020). Interestingly, the group differences in reward processing were only noted during the feedback stages of a loss condition, not during the anticipation of a reward. A study comparing World of Warcraft gamers with non-gamers observed blunted striatal activity in response to large monetary rewards in the former group (Hahn et al., 2014). Additionally, a study with a community sample of 1,510 adolescents (mean age = 14.5) reported positive activation of the bilateral caudate during the reward anticipation phase of the MID Task, indicating that greater activation in response to rewards reflects typical functioning in healthy adolescents (Cao et al., 2019). A meta-analysis of neuroimaging studies using adolescent samples similarly found positive activation of the caudate nucleus during reward anticipation (Silverman, Jedd, & Luciana, 2015). Collectively, the inverse relationship between reward anticipation and symptoms of gaming addiction may signal a blunted reward response and a reduced sensitivity to everyday rewards in certain gamers.

Strengths

The strengths of this study include a large, diverse sample of adolescents with measurement of gaming addiction symptoms across multiple timepoints. Multivariable methods reduced the influence of potential confounders (e.g., ADHD diagnosis, parental monitoring) and strengthens the validity of the associations observed. The use of Bayesian hierarchical models further improved the precision of our measures of association by accounting for the shared variance within families in the ABCD Study. Instead of using arbitrary cut points, we opted for a total score for the VGAQ. This approach minimized the risk of misclassification and allowed for a more nuanced understanding of gaming addiction that captures the full spectrum of gaming behaviors, from non-problematic to potentially problematic use. Finally, the study included the feedback phase of the MID task rather than solely focusing on anticipatory processing. By doing so, we characterized the decision-making process in children that play video games and detected differences in discrete stages of reward processing.

Limitations

There were several limitations in this study. First, the analytic sample was substantially reduced by the exclusion of children with MID task data that did not meet QC standards. Previous research using the ABCD Study data has noted that certain groups (e.g., minority children, children from lower income households) were disproportionately excluded due to poor imaging quality (Cosgrove et al., 2022; Gard, Hyde, Heeringa, West, & Mitchell, 2023). The pattern of missing task-fMRI data likely harmed the generalizability of our findings, although we did not find a significant difference in the VGAQ scores of children with and without missing MRI data. Second, exclusion of children that did not complete the VGAQ measure meant that our sample included only children that play video games. Recent national surveys estimate that 71% of Americans under 18 play video games (Entertainment Software Association, 2022). Approximately 73% of children reported playing video games at the year-2 ABCD Study visit. Consequently, we expect that the study findings will have broad applicability to the general population despite exclusion criteria. The study period coincided with the COVID-19 pandemic, which may have influenced VGAQ scores. Although we did not observe a significant difference in mean VGAQ score across the three time points, there is evidence that screen time significantly increased among ABCD participants during the pandemic (Nagata, Cortez, et al., 2022). Additional time points will be necessary to fully understand the pandemic's impact and other factors (e.g., state policies) on trajectories of gaming addiction symptoms. Finally, we only had partial year-4 data, resulting in fewer than three timepoints for some children. Future ABCD Study data releases will provide critical information on the trajectories of gaming addiction and reward-processing.

Directions for future research

The findings of this study open several avenues for future research. First, additional time points will help elucidate the role of the caudate nucleus as adolescents transition into adulthood and provide insight into whether this relationship persists over time or changes with continued exposure to gaming. Second, research should explore modifiable factors that could help prevent the onset of gaming addiction symptoms, such as family dynamics or social support. Third, future studies could explore intervention strategies that target caudate nucleus activity to mitigate gaming addiction. For example, neurofeedback training, a noninvasive technique used to modulate brain activity in the dorsal striatum, could be explored as a potential treatment approach (Zhao et al., 2021).

Implications of the study findings

The findings from our study, conducted with a generally healthy population, provide valuable insights into the early neural markers of gaming addiction. By identifying the relationship between caudate activation and symptoms of gaming addiction in a population that largely falls within the range of typical gaming behavior, our study contributes to understanding the potential boundary between healthy and problematic gaming. This knowledge is critical for developing interventions aimed at promoting healthy gaming habits before gaming behavior escalates into addiction. Future work could build on these findings by exploring how neural activity in reward-related regions could serve as early indicators for potential targeted interventions.

Conclusions

Our findings suggest that the caudate nucleus plays a significant role in gaming addiction, with greater activation potentially serving as a protective factor. These insights contribute to our understanding of the neural mechanisms underlying gaming addiction and highlight the importance of the caudate in reward processing.

Funding sources

Work on the ABCD study at the University of Rochester (UR) site is supported by a grant from the National Institute on Drug Abuse to EGF and JJF (NIDA – U01 DA050988). Neuroimaging at UR is supported by the Translational Neuroimaging and Neurophysiology (TNN) core of the UR Intellectual and Developmental Disabilities Research Center (UR-IDDRC), which is funded by a center grant from the Eunice Kennedy Shriver National Institute of Child Health and Human Development to JJF (NICHD P50 HD103536). Author EGF serves as Director of the TNN core. Adolescent Brain and Cognitive Development study is a service mark of the U.S. Department of Health and Human Services. The ABCD study is a registered trademark of the U.S. Department of Health and Human Services. DAL was funded by a National Institutes of Health (NIH)/National Institute of General Medical Sciences (NIGMS) grant (K12GM150451).

Data used in the preparation of this article were obtained from the Adolescent Brain Cognitive DevelopmentSM (ABCD) Study (https://abcdstudy.org), held in the NIMH Data Archive (NDA). This is a multisite, longitudinal study designed to recruit more than 10,000 children age 9–10 and follow them over 10 years into early adulthood. The ABCD Study® is supported by the National Institutes of Health and additional federal partners under award numbers U01DA041048, U01DA050989, U01DA051016, U01DA041022, U01DA051018, U01DA051037, U01DA050987, U01DA041174, U01DA041106, U01DA041117, U01DA041028, U01DA041134, U01DA050988, U01DA051039, U01DA041156, U01DA041025, U01DA041120, U01DA051038, U01DA041148, U01DA041093, U01DA041089, U24DA041123, U24DA041147. A full list of supporters is available at https://abcdstudy.org/federal-partners.html. A listing of participating sites and a complete listing of the study investigators can be found at https://abcdstudy.org/consortium_members/. ABCD consortium investigators designed and implemented the study and/or provided data but did not necessarily participate in the analysis or writing of this report. This manuscript reflects the views of the authors and may not reflect the opinions or views of the NIH or ABCD consortium investigators. The ABCD data repository grows and changes over time. The ABCD data used in this report came from https://doi.org/10.15154/1523041. DOIs can be found at https://doi.org/10.15154/1526509.

Authors' contribution

DL: Study concept and design, analysis and interpretation of data, statistical analysis, manuscript writing JF: Study concept and design, analysis and interpretation of data, study supervision EF: Study concept and design, analysis and interpretation of data, study supervision EVW: Study concept and design, analysis and interpretation of data, statistical analysis WT: Study concept and design, analysis and interpretation of data, statistical analysis.

All authors had full access to all data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis.

Conflict of interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Supplementary material

Supplementary data to this article can be found online at https://doi.org/10.1556/2006.2024.00068.

Abbreviations

ABCD

Adolescent Brain Cognitive Development

NAcc

Nucleus Accumbens

DACC

Dorsal Anterior Cingulate Cortex

mOFC

Medial Orbitofrontal Cortex

lOFC

Lateral Orbitofrontal Cortex

CI

Credible interval

ROI

Region of interest

CBCL

Child Behavior Checklist

MID

Monetary Incentive Delay

ADHD

Attention-deficit/hyperactivity disorder

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  • Qi, X., Yang, Y., Dai, S., Gao, P., Du, X., Zhang, Y., & Zhang, Q. (2016). Effects of outcome on the covariance between risk level and brain activity in adolescents with internet gaming disorder. NeuroImage: Clinical, 12, 845851. https://doi.org/10.1016/j.nicl.2016.10.024.

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    • Export Citation
  • Richard, J. M., Ambroggi, F., Janak, P. H., & Fields, H. L. (2016). Ventral pallidum neurons encode incentive value and promote cue-elicited instrumental actions. Neuron, 90(6), 11651173. https://doi.org/10.1016/j.neuron.2016.04.037.

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  • Rickards, G., Magee, C., & Artino Jr, A. R. (2012). You can't fix by analysis what you've spoiled by design: Developing survey instruments and collecting validity evidence. Journal of Graduate Medical Education, 4(4), 407410.

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    • Export Citation
  • Sescousse, G., Caldú, X., Segura, B., & Dreher, J.-C. (2013). Processing of primary and secondary rewards: A quantitative meta-analysis and review of human functional neuroimaging studies. Neuroscience and Biobehavioral Reviews, 37(4), 681696. https://doi.org/10.1016/j.neubiorev.2013.02.002.

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  • Stevens, M. W., Dorstyn, D., Delfabbro, P. H., & King, D. L. (2020). Global prevalence of gaming disorder: A systematic review and meta-analysis. Australian & New Zealand Journal of Psychiatry, 000486742096285. https://doi.org/10.1177/0004867420962851.

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    • Export Citation
  • Sullivan, G. M., & Artino, A. R. (2013). Analyzing and interpreting data from likert-type scales. Journal of Graduate Medical Education, 5(4), 541542. https://doi.org/10.4300/jgme-5-4-18.

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    • Export Citation
  • Team, R. (2019). RStudio: Integrated development environment for R. 2015.

  • Team, R. C. (2013). R: A language and environment for statistical computing.

  • Townsend, L., Kobak, K., Kearney, C., Milham, M., Andreotti, C., Escalera, J., & Sylvester, R. (2020). Development of three web-based computerized versions of the kiddie schedule for affective disorders and schizophrenia child psychiatric diagnostic interview: Preliminary validity data. Journal of the American Academy of Child and Adolescent Psychiatry, 59(2), 309325.

    • Search Google Scholar
    • Export Citation
  • Vehtari, A., Gelman, A., & Gabry, J. (2017). Practical Bayesian model evaluation using leave-one-out cross-validation and WAIC. Statistics and Computing, 27(5), 14131432. https://doi.org/10.1007/s11222-016-9696-4.

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    • Export Citation
  • Volkow, N. D., Koob, G. F., Croyle, R. T., Bianchi, D. W., Gordon, J. A., Koroshetz, W. J., & Weiss, S. R. B. (2018). The conception of the ABCD study: From substance use to a broad NIH collaboration. Developmental Cognitive Neuroscience, 32, 47. https://doi.org/10.1016/j.dcn.2017.10.002.

    • Search Google Scholar
    • Export Citation
  • Volkow, N. D., & Wargo, E. M. (2022). Association of severity of adolescent substance use disorders and long-term outcomes. JAMA Network Open, 5(4), e225656–e225656.

    • Search Google Scholar
    • Export Citation
  • Wang, L., Yang, G., Zheng, Y., Li, Z., Qi, Y., Li, Q., & Liu, X. (2021). Enhanced neural responses in specific phases of reward processing in individuals with Internet gaming disorder. Journal of Behavioral Addictions, 10(1), 99111. https://doi.org/10.1556/2006.2021.00003.

    • Search Google Scholar
    • Export Citation
  • Watanabe, K., & Hikosaka, O. (2005). Immediate changes in anticipatory activity of caudate neurons associated with reversal of position-reward contingency. Journal of Neurophysiology, 94(3), 18791887. https://doi.org/10.1152/jn.00012.2005.

    • Search Google Scholar
    • Export Citation
  • Weinstein, A., & Lejoyeux, M. (2020). Neurobiological mechanisms underlying internet gaming disorder. Dialogues in Clinical Neuroscience, 22(2), 113126. https://doi.org/10.31887/DCNS.2020.22.2/aweinstein.

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Dr. Zsolt Demetrovics
Institute of Psychology, ELTE Eötvös Loránd University
Address: Izabella u. 46. H-1064 Budapest, Hungary
Phone: +36-1-461-2681
E-mail: jba@ppk.elte.hu

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2023  
Web of Science  
Journal Impact Factor 6.6
Rank by Impact Factor Q1 (Psychiatry)
Journal Citation Indicator 1.59
Scopus  
CiteScore 12.3
CiteScore rank Q1 (Clinical Psychology)
SNIP 1.604
Scimago  
SJR index 2.188
SJR Q rank Q1

Journal of Behavioral Addictions
Publication Model Gold Open Access
Submission Fee none
Article Processing Charge 990 EUR/article
Effective from  1st Feb 2025:
1400 EUR/article
Regional discounts on country of the funding agency World Bank Lower-middle-income economies: 50%
World Bank Low-income economies: 100%
Further Discounts Corresponding authors, affiliated to an EISZ member institution subscribing to the journal package of Akadémiai Kiadó: 100%.
Subscription Information Gold Open Access

Journal of Behavioral Addictions
Language English
Size A4
Year of
Foundation
2011
Volumes
per Year
1
Issues
per Year
4
Founder Eötvös Loránd Tudományegyetem
Founder's
Address
H-1053 Budapest, Hungary Egyetem tér 1-3.
Publisher Akadémiai Kiadó
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 2062-5871 (Print)
ISSN 2063-5303 (Online)

Senior editors

Editor(s)-in-Chief: Zsolt DEMETROVICS

Assistant Editor(s): 

Csilla ÁGOSTON

Dana KATZ

Associate Editors

  • Stephanie ANTONS (Universitat Duisburg-Essen, Germany)
  • Joel BILLIEUX (University of Lausanne, Switzerland)
  • Beáta BŐTHE (University of Montreal, Canada)
  • Matthias BRAND (University of Duisburg-Essen, Germany)
  • Daniel KING (Flinders University, Australia)
  • Gyöngyi KÖKÖNYEI (ELTE Eötvös Loránd University, Hungary)
  • Ludwig KRAUS (IFT Institute for Therapy Research, Germany)
  • Marc N. POTENZA (Yale University, USA)
  • Hans-Jurgen RUMPF (University of Lübeck, Germany)
  • Ruth J. VAN HOLST (Amsterdam UMC, The Netherlands)

Editorial Board

  • Sophia ACHAB (Faculty of Medicine, University of Geneva, Switzerland)
  • Alex BALDACCHINO (St Andrews University, United Kingdom)
  • Judit BALÁZS (ELTE Eötvös Loránd University, Hungary)
  • Maria BELLRINGER (Auckland University of Technology, Auckland, New Zealand)
  • Henrietta BOWDEN-JONES (Imperial College, United Kingdom)
  • Damien BREVERS (University of Luxembourg, Luxembourg)
  • Julius BURKAUSKAS (Lithuanian University of Health Sciences, Lithuania)
  • Gerhard BÜHRINGER (Technische Universität Dresden, Germany)
  • Silvia CASALE (University of Florence, Florence, Italy)
  • Luke CLARK (University of British Columbia, Vancouver, B.C., Canada)
  • Jeffrey L. DEREVENSKY (McGill University, Canada)
  • Geert DOM (University of Antwerp, Belgium)
  • Nicki DOWLING (Deakin University, Geelong, Australia)
  • Hamed EKHTIARI (University of Minnesota, United States)
  • Jon ELHAI (University of Toledo, Toledo, Ohio, USA)
  • Ana ESTEVEZ (University of Deusto, Spain)
  • Fernando FERNANDEZ-ARANDA (Bellvitge University Hospital, Barcelona, Spain)
  • Naomi FINEBERG (University of Hertfordshire, United Kingdom)
  • Sally GAINSBURY (The University of Sydney, Camperdown, NSW, Australia)
  • Belle GAVRIEL-FRIED (The Bob Shapell School of Social Work, Tel Aviv University, Israel)
  • Biljana GJONESKA (Macedonian Academy of Sciences and Arts, Republic of North Macedonia)
  • Marie GRALL-BRONNEC (University Hospital of Nantes, France)
  • Jon E. GRANT (University of Minnesota, USA)
  • Mark GRIFFITHS (Nottingham Trent University, United Kingdom)
  • Joshua GRUBBS (University of New Mexico, Albuquerque, NM, USA)
  • Anneke GOUDRIAAN (University of Amsterdam, The Netherlands)
  • Susumu HIGUCHI (National Hospital Organization Kurihama Medical and Addiction Center, Japan)
  • David HODGINS (University of Calgary, Canada)
  • Eric HOLLANDER (Albert Einstein College of Medicine, USA)
  • Zsolt HORVÁTH (Eötvös Loránd University, Hungary)
  • Susana JIMÉNEZ-MURCIA (Clinical Psychology Unit, Bellvitge University Hospital, Barcelona, Spain)
  • Yasser KHAZAAL (Geneva University Hospital, Switzerland)
  • Orsolya KIRÁLY (Eötvös Loránd University, Hungary)
  • Chih-Hung KO (Faculty of Medicine, College of Medicine, Kaohsiung Medical University, Taiwan)
  • Shane KRAUS (University of Nevada, Las Vegas, NV, USA)
  • Hae Kook LEE (The Catholic University of Korea, Republic of Korea)
  • Bernadette KUN (Eötvös Loránd University, Hungary)
  • Katerina LUKAVSKA (Charles University, Prague, Czech Republic)
  • Giovanni MARTINOTTI (‘Gabriele d’Annunzio’ University of Chieti-Pescara, Italy)
  • Gemma MESTRE-BACH (Universidad Internacional de la Rioja, La Rioja, Spain)
  • Astrid MÜLLER (Hannover Medical School, Germany)
  • Daniel Thor OLASON (University of Iceland, Iceland)
  • Ståle PALLESEN (University of Bergen, Norway)
  • Afarin RAHIMI-MOVAGHAR (Teheran University of Medical Sciences, Iran)
  • József RÁCZ (Hungarian Academy of Sciences, Hungary)
  • Michael SCHAUB (University of Zurich, Switzerland)
  • Marcantanio M. SPADA (London South Bank University, United Kingdom)
  • Daniel SPRITZER (Study Group on Technological Addictions, Brazil)
  • Dan J. STEIN (University of Cape Town, South Africa)
  • Sherry H. STEWART (Dalhousie University, Canada)
  • Attila SZABÓ (Eötvös Loránd University, Hungary)
  • Hermano TAVARES (Instituto de Psiquiatria do Hospital das Clínicas da Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil)
  • Wim VAN DEN BRINK (University of Amsterdam, The Netherlands)
  • Alexander E. VOISKOUNSKY (Moscow State University, Russia)
  • Aviv M. WEINSTEIN (Ariel University, Israel)
  • Anise WU (University of Macau, Macao, China)
  • Ágnes ZSILA (ELTE Eötvös Loránd University, Hungary)

 

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