Criminal behavior, lack of guilt, and irritability are typical features of antisocial personality disorder. Evidence suggests that a low-activity variant of the MAO-A gene predisposes to adult antisocial behavior in men, especially in those who faced early adversity1–4. Catechol-O-methyltransferase enzyme metabolizes dopamine and other monoamines. Its gene, the COMT-gene, occurs in two forms: a high-activity form and a low-activity form. They associate these variants with differential abilities of the prefrontal cortex, especially working memory. People with low-activity form may have a more efficient prefrontal cortex, likely because of the greater dopamine level in the synaptic space5,6. We have associated serotonin transporter gene variants with neuroticism and a predisposition to depression. The variants may also influence individual response to SSRIs8. APOE4 gene is a risk factor for Alzheimer’s disease (compared to APOE2 and APOE3).
ICD-11 Criteria for Attention Deficit Hyperactivity Disorder (ADHD) 6A05 Attention deficit hyperactivity disorder is characterised by a persistent pattern (at least 6 months) of inattention and/or hyperactivity-impulsivity that has a direct negative impact on academic, occupational, or social functioning. There is evidence of significant inattention and/or hyperactivity-impulsivity symptoms prior to age 12, typically by early to mid-childhood, though some individuals may first come to clinical attention later. The degree of inattention and hyperactivity-impulsivity is outside the limits of normal variation expected for age and level of intellectual functioning. Inattention refers to significant difficulty in sustaining attention to tasks that do not provide a high level of stimulation or frequent rewards, distractibility and problems with organisation. Hyperactivity refers to excessive motor activity and difficulties with remaining still, most evident in structured situations that re...
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