스트레스 유발 처치에 따른 시공간과제 수행력과 뇌 활성화 변화 = Cerebral Cortical Activation and Performance of Visuomotor Task according to the Stress-eliciting Treatment

다국어 초록 (Multilingual Abstract)

The purpose of this study was to investigate the effect of stress elicited by social evaluation, competition, and monetary reward on performance of visuo-motor task and neural efficiency. Participants were fifteen college age students whose mean age is 23. 5 years. Participants were assigned to both non-stress condition(practice alone) and stress-eliciting treatment condition. During performing visuo-motor pointing task on both conditions, heart rate, electroencephalography(EEG), competitiveness and stress were measured. The performance score has been calculated by root mean square error(RMSE). To examine if stress-eliciting treatment significantly increases arousal compared to non-stress condition, paired-t test was employed on heart rate, competitiveness and stress. Separate 2 (conditions) * 2 (hemisphere) * 5 (brain regions) repeated measures ANOVA was conducted to examine the influence of stress-eliciting treatment on brain activity. Dependent measures were delta, theta, alpha, beta, gamma powers. As the result, although heart rate in stress condition was significantly higher than one in non-stress condition, performance was better in stress condition relative to non-stress condition. The result of EEG analysis revealed that activation in right hemisphere that is responsible for visual-spatial processing under stress condition was higher relative to non-stress condition. The difference between non-stress and stress treatment condition was only observed in temporal region. The results imply that stress treatment eliciting moderate level of arousal appears to improve performance by increasing neural efficiency, which is characterized by greater activation in task-relevant brain areas.

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