Psychological disorder A syndrome marked by a clinically significant disturbance in a persons cognitions

ADHD a psychological disorder marked by extreme inattention

epigenetics The study of the molecular ways by which environments can express gene expression

anxiety disorders Characterized by distressing persistent anxiety

phobia An anxiety disorder marked by a persistent irrational fear

OCD Disorder characterized by unwanted repetitive thoughts or actions

PTSD Disorder characterized by haunting memories

Psychoactive drug A chemical substance that alters perception and mood

Alcohol use disorder Alcohol use marked by tolerance, withdrawal, and a drive to continue problematic use