Gambling: here are the brain mechanisms that foster addiction
The disorder is the outcome of an integrated dysfunction of different motivational, affective and cognitive systems, but prevention and early support are possible
by Gianluca Bruti*
Key points
Gambling Disorder (GDD), defined in the Diagnostic and Statistical Manual of Mental Disorders (DSM-5, 2013) as a behavioural addiction, is today an issue of clinical and public health importance. Even in the Italia context, the phenomenon takes on significant dimensions and requires an approach that knows how to combine prevention, early recognition and adequate support tools.
The available data confirm the need for a non-marginal reading of the problem. According to the ISTISAN Report 19/28 of the Istituto Superiore di Sanità, published in 2019 on data collected in 2017, 36.4% of the Italian adult population, or about 18.4 million people, said they had engaged in gambling with cash winnings at least once in the previous 12 months. This figure describes the prevalence of gambling behaviour in the general population, and not the prevalence of the disorder. However, a more limited but clinically relevant share presents problematic characteristics: 3% according to Iss data referring to 2018 and 4% according to the Ipsad study recalled in 2023 on the population aged between 18 and 84. Again, these are estimates referring to problematic or risky behaviour, which do not automatically overlap with an overt diagnosis of ADI.
The dysfunction of motivational systems
From a neurobiological point of view, ADI can be read as the outcome of an integrated dysfunction of different motivational, affective and cognitive systems. In many subjects one observes a hyperactivation of the threat system, associated with states of alertness, anxiety and chronic stress, accompanied by a difficulty in accessing internal safety and regulation systems. Within this framework, gaming behaviour may assume a compensatory function, becoming a dysfunctional attempt to modulate internal tension, emotional emptiness or dysregulation.
At the same time, the dopaminergic reward system may undergo progressive sensitisation to the stimuli typical of gambling, especially in the presence of intermittent and unpredictable reinforcements. It is precisely this dynamic, well known in the addiction clinic, that fosters the transition from initially episodic behaviour to repetitive, increasingly less free and increasingly automated conduct.
A further central element in the psychopathology of ADI is neurocognitive distortions. These include the illusion of control, interpretative biases relating to winnings, minimisation of losses, mnestic selection of favourable episodes and an altered temporal and quantitative perception of gaming behaviour. These processes are not ancillary aspects, but maintenance mechanisms of the disorder: they reduce the subject's ability to realistically represent the economic, relational and psychological consequences of their behaviour and hinder the activation of a timely request for help.


