To the Editor Mollon and colleagues1 present data from a population-based study evaluating neuropsychological functioning in adults with subclinical psychotic experiences. As rightly noted by the authors,1 previous studies did not adjust for key sociodemographic confounders. Therefore, Mollon et al1 evaluated ethnicity, occupation, cannabis use, and common mental disorders, and all were found to correlate significantly with both psychotic experiences and cognitive performance. Adjusting for these factors notably reduced differences in cognitive functioning between individuals with psychotic experiences and those without. Yet, we believe that one important confounder was not corrected for in the Mollon et al1 study.
Begemann MJH, Heringa SM, Sommer IEC. Childhood Trauma as a Neglected Factor in Psychotic Experiences and Cognitive Functioning. JAMA Psychiatry. 2016;73(8):875-876. doi:10.1001/jamapsychiatry.2016.0924