[Sympathetic skin response and emotional changes of visual stimuli].

We studied sympathetic skin response (SSR) to visual emotional stimuli in 11 normal children and 13 normal adults. The arousal and valence levels of original pictures were previously assessed by 20 normal children and adults. SSR appearance ratio tended to be high for pictures with high arousal and those with either high or low valence, and was higher in children than in adults. The response for pictures with high arousal and low valence was different between children and adults. These pictures were classified into 2 groups; one consisted of disgusting creatures such as worms and roaches, and another of violent scenes, symbolizing physiological and social unpleasure, respectively. In children, SSRs were evoked with the same ratio for these two groups of pictures. In adults, however, SSRs for social unpleasure pictures were evoked with a significantly higher ratio compared to those for physiological ones. These results indicate that children are more susceptible to emotional stimuli and that this susceptibility diminishes with development, suggesting the association between emotional signal and moral development.

[Evaluation of sympathetic skin response in patients with attention deficit/hyperactivity disorder presenting with comorbid disorders].

We studied sympathetic skin response (SSR) to visual emotional stimuli in two children with attention deficit/hyperactivity disorder (AD/HD) and nine healthy controls, and correlated them with comorbid disorders. They were diagnosed as having conduct disorder at administration. Two years after interventions of medical care, counseling and education, they were improving in behavior, one with oppositional defiant disorder (ODD) and another without ODD at this study. SSR were evoked in the patient without ODD (a 10-year-old boy), but not in the patient with ODD (a 12-year-old boy). These findings indicate failure of a patient with both AD/HD and ODD to respond autonomically to social stimuli, and suggest association between emotional signal and empathy.

[Ictal SPECT and paired stimulation SEP recovery curve in a patient with paroxysmal kinesigenic choreoathetosis].

Paroxysmal kinesigenic choreoathetosis (PKC) is a rare and benign disorder with its onset in childhood. PKC generally improves with age, and its pathophysiology has not been revealed. We recorded both ictal and interictal SPECT in a 14-year-old girl with PKC. Ictal SPECT showed a significant decrease in blood flow in the caudate nucleus contralateral to the limb showing an involuntary movement. We also examined paired-pulse stimuli somatosensory evoked potential (SEP) of the same patient. Recovery pattern of P25 and N33 components was normal and comparable to 5 healthy volunteers, suggesting the absence of cortical hyperexcitability. These results suggest dysfunction or immaturity of the indirect pathway of basal ganglia in PKC, as well as the hyperexcitability of the descending pathway.