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but the most important seem to be Dopamine, Serotonin, Noradrenaline, So far sixteen different serotonin receptors have been found on brain cells and more are expected to be found however seretonin pathways can be easily detected as depicted in fig.1.0
The wide assortment of receptors --- tiny doors on cell
surfaces through which neurotBrain scan of Serotonin Pathways |
ransmitters enter - explains how serotonin can affect so many drives and emotions. The most profound discovery is that genetic defects also produce abnormal levels of serotonin and noradrenalin, two potent brain chemical that researchers have successfully manipulated to make animals more violent or less violent.?
Moreover Brain scans of psychopaths by Professor Robert Hare at the University of British Columbia suggest aggressive behavior may be partly due to an amygdala malfunction, particularly in the right hemisphere. There are fairly two obvious ways in which emotional control might break down. One is if the signals sent from the cortex to limbic system are too
weak or undirected to override the activity arising from amygdala. The other is if the amygdale is activated in the absence of any outside stimulus that would simultaneously arouse the cortex. 8
Neurotransmitters are
chemical substances released in The brain of murderers (left) show | brain following physical , significant lack of activity compared to chemical, and physiological and normal brains (right)-[from Raine et al
"electrical stimuli. These Selective reductions in pre frontal glucose metabolism in murderers Biological neurotransmitters released in Psychiatry Vol 6, september 1994] brain, modify the behavior of an
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