Gaming

Human evidence

Gaming holds an unusual place in dopamine research: it is the subject of one of the field’s genuinely landmark human studies, published in 1998, well before gaming disorder existed as a diagnosis.

Eight healthy volunteers were scanned with PET and [11C]raclopride, a tracer that competes with the brain’s own dopamine for the same D2 receptors, while they played a simple video game involving a goal-directed motor task. Raclopride binding in the striatum dropped significantly during play compared with baseline, showing that real dopamine had been released and was occupying receptors the tracer would otherwise have bound.¹

The size of that drop — and so the amount of dopamine released — correlated positively with how well people performed at the game, and the effect was largest in the ventral striatum. The authors described this as the first demonstration of dopamine release tied to a specific human behaviour, rather than to a drug, which is what makes the study a genuine landmark rather than just an early data point about games specifically.¹

That study is nearly three decades old, used a simple game by modern standards, and studied eight people once. It is strong, direct evidence that goal-directed gameplay can release striatal dopamine in humans; it says nothing on its own about gaming disorder, modern game design, or how large this effect is compared with other rewarding activities, because none of those comparisons were tested.¹

Gaming disorder itself, recognised in ICD-11 as a pattern of persistent gaming causing significant impairment, has since attracted a much larger neuroimaging literature. A review of that literature reports that people with the disorder show activation in reward-related brain regions during cue exposure and craving tasks, reduced activity in brain areas linked to impulse control and decision making, reduced functional connectivity in networks tied to cognitive control and motivation, and structural changes including reduced grey-matter volume — broadly similar to other addictions.²

That review explicitly notes an involvement of dopamine-mediated reward mechanisms in these findings, but most of the underlying studies it describes use fMRI and structural imaging rather than PET or pharmacological challenge, which is a materially weaker way of implicating dopamine specifically than the direct measurement used in the original 1998 study.²

The same review makes a point worth keeping: gaming activates brain regions tied to cognitive, motor and sensory processing that are not directly involved in substance-based addictions, because playing a game is a much richer sensorimotor task than taking a drug. That is one reason gaming disorder cannot simply be assumed to be ‘the same as’ drug addiction on the dopamine system, even where some reward-circuit findings look similar.²

Animal evidence

No animal gaming-specific dopamine studies are reviewed here; gaming is a human behaviour, and the relevant direct evidence is the human PET study above rather than a preclinical model.

Mechanism

The 1998 PET study’s mechanism is straightforward: a goal-directed, effortful, rewarding task engages dopamine neurons and their striatal projections, the same general circuitry implicated in learning from any outcome that is better or worse than expected, not something unique to screens or games.¹

There is also a genre and design question the current evidence cannot answer. Modern games span everything from single-player puzzle apps to persistent online multiplayer titles with variable reward schedules and social features, and no PET study reviewed for this page compared dopamine release across different game types or design features. Claims that a particular game or genre is ‘engineered to maximise dopamine’ are, on the evidence collected here, not something that has been directly tested.¹

For most people, occasional or moderate gaming is simply an enjoyable, effortful, goal-directed activity that engages the same general motivational circuitry as many other rewarding pursuits, which is the more mundane but better-supported reading of the 1998 finding. Gaming disorder, as a diagnosis, describes a much smaller group for whom gaming has become persistently harmful, and the broader reward-circuit and structural brain findings in that group echo patterns seen across other addictions without proving an identical underlying mechanism.²

Evidence strength

• CEvidence grade C · Limited or observational human evidence

One landmark PET study directly measured striatal dopamine release during video game play in eight healthy people ¹, giving genuine, if small and old, human dopamine evidence. Newer work on gaming disorder specifically is a substantial literature, but the review used here is explicit that most of it relies on fMRI and structural imaging rather than direct dopamine measurement ², so grade C rather than B or A.

Key studies

• PET study, 8 healthy volunteers: playing a video game significantly reduced striatal raclopride binding versus baseline, with dopamine release correlating with in-game performance and greatest in the ventral striatum.¹
• Narrative review of internet gaming disorder neuroimaging: describes reward-region activation to gaming cues and craving, with involvement of dopamine-mediated reward mechanisms.²
• Same review: reports reduced activity in impulse-control brain regions and reduced functional connectivity in cognitive-control and motivation networks in people with gaming disorder.²
• Same review: reports structural changes, mainly reduced grey-matter volume and white-matter density, and notes gaming-specific sensorimotor brain involvement not shared with substance addictions.²

References

1. 1. Koepp MJ, et al. Evidence for striatal dopamine release during a video game. Nature. 1998. PMID 9607763. doi:10.1038/30498
2. 2. Weinstein A and Lejoyeux M Neurobiological mechanisms underlying internet gaming disorder
. Dialogues in clinical neuroscience. 2020. PMID 32699511. doi:10.31887/DCNS.2020.22.2/aweinstein