Existing EEG and PET brain scan technology show that sociopaths do not process emotional information the way other people do. It is believed that in childhood, a born sociopath learns to direct such input through other routes in the cerebral cortex, but as of yet no one knows what blocks the impulses and signals from following their normal route. Cortical underarousal, underactive sympathetic division of the autonomic nervous system, and brain waves while awake (on EEG) that resemble the alpha-waves of light sleep, are all common or universal symptoms of primary psychopaths.
In addition, more and more research shows that psychopaths lack the neurotransmitter Oxytocin (secreted by the pituitary gland) and often have only half as much Vasopressin (antidiuretic hormone) as most people do. Abnormalities are thus not confined to the cerebral cortex; they can be found in the cingulate gyrus and the entire limbic system as well. ANYTHING THAT AFFECTS NEUROLOGICAL DEVELOPMENT OF THE FETUS CAN POSSIBLY CAUSE THESE DEFICIENCIES.
In addition to this, a child's brain develops exponentially after birth, and early development requires physical contact and stimulation in order to form the basis for interpersonal bonding; secondary psychopaths are thought to have lacked this; refers to Reactive Attachment Disorder too.
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