- DSM-5 Condition for Further Study status
- IGD appears in DSM-5's Section III (Emerging Measures and Models) rather than as a formal disorder in Section II. This status indicates that the construct has sufficient clinical and research interest to warrant attention and further investigation, but does not yet meet the evidentiary threshold for official disorder recognition. The ICD-11 (2022) went further and included Gaming Disorder as a formal diagnosis, creating a notable divergence between the two major classification systems.
- Two-factor model
- A framework distinguishing disordered gaming from engaged (passionate but non-disordered) gaming. The model proposes that the nine DSM-5 criteria cluster into two dimensions: loss of control and preoccupation (core addiction features) versus other criteria that may reflect high engagement rather than disorder. Empirical support for the two-factor structure has been inconsistent, with some studies finding a unidimensional structure and others supporting a more complex factor model.
- Prevalence and heterogeneity
- Prevalence estimates for IGD vary enormously across studies — from under 1% to over 10% depending on the population, country, measurement instrument, and diagnostic threshold used. This heterogeneity is itself a major methodological concern: without standardised assessment criteria applied consistently, prevalence figures are not comparable across studies and may not reflect a single underlying clinical entity.
- Sensitivity and specificity
- In diagnostic assessment, sensitivity is the ability of a test to correctly identify those who have the disorder (true positive rate); specificity is the ability to correctly identify those who do not (true negative rate). IGD screening instruments face a fundamental trade-off: thresholds sensitive enough to catch all cases tend to misclassify engaged but non-disordered gamers; thresholds specific enough to exclude false positives may miss genuine cases.
- Executive functioning and impulse control
- Multiple neuropsychological studies have found that individuals meeting IGD criteria show impairments in executive functions — particularly inhibitory control, cognitive flexibility, and decision-making under uncertainty. These deficits parallel findings in substance-use disorders and may reflect both a predisposing vulnerability and a consequence of prolonged heavy gaming. The prefrontal cortex, central to executive control, shows structural and functional differences in some IGD samples.
- Emotion regulation
- Heavy gaming frequently serves emotion-regulation functions: escapism from negative affect, anxiety, depression, or boredom. In individuals with IGD, gaming may function as a maladaptive coping mechanism that temporarily reduces distress but reinforces the pattern through negative reinforcement. High rates of comorbid depression, anxiety, ADHD, and social anxiety are consistently reported in IGD samples, raising the question of whether IGD is a primary disorder or a symptom of underlying emotional difficulties.
- Behavioural addiction model
- IGD has been conceptualised within the broader framework of behavioural (non-substance) addictions — a category that includes gambling disorder (the only formally recognised behavioural addiction in DSM-5). The addiction model holds that behavioural and substance addictions share common neurobiological mechanisms involving dopaminergic reward circuits, and that compulsive loss of control over an appetitive behaviour can constitute a disorder regardless of whether a psychoactive substance is involved.