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Low performance in decision-making under ambiguity and abnormal social behavior distinguished PD patients with PG from those without this disorder. Dopamine replacement therapy may induce dysfunction of the ventromedial prefrontal cortex and amygdala-ventral striatum system, thus increasing the risk for developing PG.

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Social cognitive tasks induce a pattern of peripheral autonomic activity different from that seen in generic arousal responses, and this pattern is abnormal in schizophrenia patients. Autonomic abnormalities in unaffected first-degree relatives seem restricted to the parasympathetic division of the ANS.

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