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스포츠심리학 : 선택적 주의과제에서 시각자극 난이도에 따른 뇌파변화
이정희(JungHeeLee),김진구(JinGuKim),정상택(SangTackChung),김성운(SungWoonKim),이인희(RenXiLi) 한국체육학회 2005 한국체육학회지 Vol.44 No.6
The purpose of this study was to examine the P300 by gradually increasing the visual stimulus and the subject identification degrees to find out the reaction changes inside the information processing part of the brain. Subjects consisted of 14 University students, whose ages ranged from 21 to 26 with an average age of 21.5. The subjects were ordered to divide five circles into 3(task3), 4(task4), 5(task5), 6(task6) and 7(task7) parts. After dividing, subjects were shown an image of one of the previously divided circles and then asked to react the presented images match from one of the five circles laid out before then. Results were analyzed based on the average ranges of Fz, Cz, Pz, O1 and O2. Results showed that correct responses to magnetic pole identification in task3 was higher than task7. P300 latencies of subjects were also higher in task3 than task4, task5 and task6. Comparison of amplitude and latency ranges revealed that Fz, Cz, and Pz had high amplitude but long latencies, while O1 and O2 had low amplitude but short latencies. In addition, standard stimulus showed a higher amplitude and longer latency than target stimulus, which showed low amplitude and short latency. In conclusion, P300 may be associated with task identification and decision making. Higher amplitudes suggest that the brain needed more cognitive effort which may have resulted in the delay of the actual condition. This study may help in understanding the relationship between the degrees of identification and the brain's cognitive process in brain neurophysiology.
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