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Yazar
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A man, Charlson, invited his son to look out of the window at a rat in the river below, whereupon he hit his son on the head with a mallet and threw him out of the window. This may look superficially like a clear-cut case of insanity, but it was decided that he was suffering from automatism when it was revealed that the man had a brain tumour.
Serotonin is structurally similar to other signalling molecules noradrenalin and dopamine. Abnormally high or low concentrations of these compounds can have behavioural consequences, including the suggestion that low concentrations of noradrenalin can contribute to depression whereas excessive concentrations are associated with manic behaviour.