Explore the Impacts of One Session and Multiple Session Theta Burst Stimulation Over Cerebellum in Adults With Autism Spectrum Disorder

Inclusion criteria for autistic adults: - Autistic adults (≥18 years old), confirmed by Autism Diagnostic Observation Schedule. - DSM-5 severity level of ASD: level 1 or level 2 Inclusion criteria for typically developing control: - ≥18 years old without autism spectrum disorder Exclusion criteria for all participants: - Previous or current severe neurological disorders, especially epilepsy - Previous or current severe systemic diseases such as cardiovascular disease, diabetes or hypertension - Previous or current severe brain injury - Implementation of metal materials such as a pacemaker or medication pump - Previous or current severe psychiatric disorders such as schizophrenia, bipolar disorder, severe major depressive disorder or substance abuse - Pregnancy - Intracranial space occupied lesions - Previous brain surgery or central nerve system infection - Concurrent use of medications which increased the risk of seizure attack - Participate in another clinical trial within one month - With damaged skin at the stimulated region - With multiple sclerosis - With large ischemic scars - Have experienced sleep disorders during brain stimulation - Severe alcoholism - Concurrent use of antiepileptic drugs - Uncontrollable migraines due to increased intracranial pressure - Unsuitable for MRI (e.g. those with claustrophobia) - Unsuitable for EEG - DSM-5 severity level of ASD: level 3 - Suicidal ideation within one year Withdrawal criteria: - Seizure attack during the study period - Autistic symptoms worsened obviously during the study period (change of DSM-5 severity level) - Extreme agitation or irritability during the study period - Participants request - Clinical symptoms worsened obviously during study period - Start to use antiepileptic drugs during study period - Suicidal ideation or self-harm behaviors during study period Always talk to your doctor about whether this trial is right for you.