The aim of the present study was to examine verbal internal source monitoring, a memory process which allows to discriminate between internal and external speech, in a sample of 135 community adolescents, and to identify its potential links to regional cortical thickness. For this purpose, we used a self-generated speech monitoring paradigm, and each participant underwent a structural brain scan. Secondly, because source monitoring deficits have been consistently reported in populations on the clinical to nonclinical psychosis continuum, we aimed to examine the relations between source monitoring performance and schizotypal expression. Schizotypy is a personality trait normally distributed in the population, associated with adaptive characteristics such as creativity, and was assessed with the Schizotypal Personality Questionnaire (SPQ)...