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KMID : 1003120100020010001
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Journal of Korean Society of Neurocognitive Rehabilitation
2010 Volume.2 No. 1 p.1 ~ p.14
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Effect of Cognitive Task on EEG in Patients with Damaged Basal Ganglia
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Lee Jeong-Weon
Ahn Si-Nae
Kim Young-Sil
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Abstract
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Objective : The purpose of this study was to determine the effects of performance of cognitive task on EEG and attentiveness by comparing alpha wave.
Methods : Regarding 9 subjects who among patients with apparent change in basal ganglia due to stroke. According to the conditions of the research task, the relative power of alpha wave was collected by dividing it into background EEG, passive task EEG, and cognitive task EEG. With A1 and A2 as standard electrodes, comparison was held based on calculating the power spectrum such as delta wave(0~3Hz), theta wave(3~8Hz), alpha wave(8~13Hz), beta
wave(13~30Hz), gamma wave(30~50Hz), and etc. And it was held through Fast Fourier Transform(FFT) regarding the values in the position of Fp1, Fp2, P3, P4, T3, T4, O1, O2.
Results : Alpha wave of all conditions in descriptive statistics amount showed the lowest in left Parietal lobe. And, the total average of alpha wave showed the lowest order of background, passive, and cognitive relative power. Regarding the correlation of the three EEG they all showed high degree of correlation(r=.69~.90). Regarding alpha wave of background and passive brain waves in left Parietal lobe, background wave showed lower average of 3.54 than passive wave(p<.05). Regarding alpha wave of background and cognitive wave in the right Occipital lobe, cognitive wave showed lower average of 25.68 than background wave(p<.05).
Conclusion : Viewing the results above, it showed significantly low alpha wave in left Parietal lobe for background and passive EEG, and in the right Occipital lobe for background and cognitive EEG. Therefore, the fact that it showed low alpha wave led to the fact that more attention is required when performing cognitive task. In future studies, studies on CBF or brain image are necessary.
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KEYWORD
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Alpha wave, Attention, Basal Ganglia, Cognition, EEG
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