Aim 2. Determine the effect of left DLPFC rTMS on core symptoms of ASD: The investigators hypothesize that subjects will experience reduction in core symptoms of ASD after completing all 25 sessions, as compared with their symptom burden prior to initiating treatment. For social and communication deficits, informant and/or self-report evaluations will be made pre- and post-TMS with the Social Responsiveness Scale (SRS), the Ritvo Autism Aspergers Diagnostic Scale-Revised (RAADS-R) and the Aberrant Behavior Checklist (ABC). Repetitive and restricted behavior will be evaluated using the Repetitive Behavior Scale-Revised (RBS-R), the ABC, and RAADS.