Our study focused on the independent effects of AUD and CUD in a sample of 45 adults reporting current use of both substances. We found that in adults using both cannabis and alcohol, those with AUD had significantly weaker alpha responses during visual-spatial processing within the lateral occipital cortices. Additionally, reduced alpha responses were related to increased AUD symptoms, indicating that reduced alpha power scales with more severe AUD. In contrast, no effects of CUD were identified in this sample. This study is the first to look at oscillatory alterations during visual processing in the context of substance use disorders.
