The Internet has grown considerably in the last twenty years, and as a result, cases of excessive iinterney use have emerged. These cases, which have clinical similarities with substance addiction, involve the various activities related to the Internet (online gambling, discussion forums, online networking, e-mail, pornography, shopping, etc.). However, to date, only the pathological use of Internet gaming (PUIG) is referenced in the 5th edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5, section III).

In PUIG, an individual loses control when gambling online. He/she typically spends 8 to 10 hours on this activity, sometimes without eating or sleeping. Usual obligations, such as school or work, or family obligations are neglected. PUIG can cause great psychological and social suffering. Neurological complications (epilepsy) and deaths (cardiac arrest) related to PUIG have also been reported. These situations are all the more dramatic because they often affect adolescents and young adults. In Asia, PUIG has become a public health problem. To date, no treatment has been validated for this disorder.

Non-invasive brain stimulation (NIBS) techniques can modulate neural activity in the dorsolateral prefrontal cortex (DLPFC). This modulation makes it possible to reduce addictive behaviours through different mechanisms (reduction of craving, impulsivity, and decision-making disorders). These techniques could be effective for PUIG.

Inclusion Criteria:

• Patient aged ≥ 12 years old
• Patient and/or parents who have given oral consent
• Patient with PUIG (DSM-5 criteria)
• Patient that is motivated and willing to reduce or stop internet gaming

Exclusion Criteria:

• a person who is not affiliated to or not a beneficiary of a social security scheme
• Patient with severe chronic psychiatric comorbidity (schizophrenia, paranoia, chronic hallucinatory psychosis) and bipolar disorder types I and II
• Patient with a gambling addiction
• Patient who has had a recent change (< 1 month) in the prescription of psychotropic treatment
• Patient with an addiction to a psychoactive substance other than tobacco
• Patient receiving psychiatric care without consent or legal protection (guardianship, curatorship)
• Minor patient without parental consent for care
• Patient with severe heart, kidney, liver or lung failure
• Patient with a contraindication to the practice of tDCS: metal parts, medical devices implanted in the brain
• Pregnancy or breastfeeding in progress (negative pregnancy test)
• Patient unable to commit to a three-month follow-up