A brain signal during risky choices was associated with later relapse in an early-abstinent methamphetamine cohort. It was a promising research association, not a validated test that can tell whether a particular person will resume use.
Gowin and colleagues scanned 68 methamphetamine-dependent adults enrolled in treatment during early abstinence. Participants completed a risk-taking task during functional MRI. Sixty-three were assessed approximately one year later: 18 reported relapse and 45 reported continued abstinence. This was a prospective human observational study, not a randomized treatment comparison.
Participants who remained abstinent showed greater insula activation during risky than safe choices. Those who relapsed showed less differentiation between those conditions. The reported association concerned that risky-minus-safe activation difference, rather than simply whether the insula was active. Lower differentiation was associated with higher relapse susceptibility.
The investigators did not find significant behavioral differences between the relapse and abstinence groups on the task. Thus, the result was not that future relapsers visibly chose more dangerously in every comparison. Neural processing and overt choices can yield different information, especially when task incentives allow several approaches without a clear advantage.
Relapse status came from telephone or in-person interviews and was not confirmed by urine testing. Underreporting could therefore affect classification. Only a limited number of relapse events supported the analysis, and a model developed in one selected sample needs independent validation before individual use. Association with a later outcome also does not establish that changing this brain signal would prevent relapse. A clinical history, a urine result and an fMRI contrast are different forms of evidence; none can be substituted for another without demonstrating that the substitution is reliable.
See also similar risk-task behavior with different brain responses.