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| EEG Power and SpaceSpecific Analysis on Target Detection of Vision, Audition and Somatosensory |
1 College of Precision Instruments and Optoelectronics Engineering, Tianjin University, Tianjin, 300072, China
2 College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen 518060, China
3 Institute of Biomedical Engineering，Chinese Academy of Medical Sciences，Tianjin 300192, China |
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Abstract In present study, both behavioral and EEG power analysis were engaged to verify the electrophysiological characteristic of brain hemisphere in a frequency and spatialdistribution view during the processing of target detection in visual, auditory and somatosensory modalities. EEG of 64channels was recorded in healthy subjects during current experiment. The experimental stimuli materials included target and nontarget 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 nontarget 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) in three modalities were consistent with the distribution of significantly difference electrodes in EEG power analysis, therefore the EEG power can be a potential electrophysiological (EEG) parameter recogniting task difficulty during target detection across vision, audition and somatosensory.
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