Examination of Transcranial Focused Ultrasound on Brain Activity in Adults

The investigators aim to examine the immediate effect of transcranial focused ultrasound (tFUS) on brain activity in healthy adults.

Inclusion Criteria: * No present/lifetime history of major depressive disorder (MDD), psychosis, Bipolar Disorder; Hamilton Depression Rating Scale (HDRS)\>7; Young Mania Rating Scale (YMRS)\>10), borderline personality disorder, and present suicidal ideation * No family history of MDD, psychosis, Bipolar Disorder, or epilepsy Exclusion Criteria: * Present/lifetime history of MDD, psychosis, Bipolar Disorder (HDRS\>7; YMRS\>10), borderline personality disorder, and present suicidal ideation. Childhood history of, but not present, anxiety disorders and Attention-deficit/hyperactivity disorder (ADHD) will be allowed as these are common disorders in childhood * Family history of MDD, psychosis, Bipolar Disorder, or epilepsy * History of head injury, neurological (e.g., epilepsy), pervasive developmental disorder (e.g., autism), systemic medical disease and treatment (medical records, participant report) * Use of substances with seizure risk (e.g., stimulants) in the past month, as for other non-invasive neuromodulation techniques, assessed as screening and before each tFUS session * Mini-Mental State Examination (MMSE) score (cognitive state) \