中文摘要：

利用行为学和EEG频谱能量分析方法，考察大脑对视、听和体感单通道靶刺激探测的频段和空间半球分布。采集14位健康受试者的64导联脑电数据，实验材料分为视觉、听觉和体感觉的靶刺激和非靶刺激。分析了3个感觉通道下所有受试者靶刺激EEG Power显著强于非靶刺激的频谱和脑区分布，还比较了3个感觉通道靶刺激的行为学数据。结果表明，体感觉靶刺激探测的难度显著大于听觉和视觉靶刺激探测。delta和theta频段在三感觉通道靶刺激探测过程中都发挥主要作用，印证ERPs成份中的P300在三感觉通道靶刺激探测过程中发挥主要作用。大脑对近点靶刺激的探测具有明显的左半球优势。三感觉通道靶刺激探测的行为学结果（错误率）与EEG Power结果（显著性差异电极统计）趋于一致，表明EEG Power分析可作为视、听、体三通道认知任务难度分类的潜在电生理学参数。

英文摘要：

In present study, both behavioral and EEG power analysis were engaged to verify the electrophysiological characteristic of brain hemisphere in a frequency and spatial-distribution view during the processing of target detection in visual, auditory and somatosensory modalities. EEG of 64-channels was recorded in healthy subjects during current experiment. The experimental stimuli materials included target and non-target stimuli from visual, auditory and somatosensory respectively. By analyzing those frequencies and brain regions which presented a significantly difference when compared the EEG power of target with non-target across three modalities, at the same time a behavioral data analysis was performed for all target conditions. Results showed the difficulty of detection for somatosensory target stimulus is significantly larger than that of visual and auditory one. Both delta and theta bands made a key role while the target stimuli were detected across visual, auditory and somatosensory modalities, as a ERP component the P300 was confirmed to take a mainly effect during above processing. There was a clear left hemisphere dominant activation when auditory target was detected. By comparing behavioral results with EEG power results, the distribution of behavioral data error rates） EEG power in three modalities analysis, therefore recogniting task difficulty during were consistent with the distribution of significantly difference electrodes in the EEG power can be a potential electrophysiological （EEG） parameter target detection across vision, audition and somatosensory.