Studies for the face perception in humans using the scalp current density analysis of electroencephalograms
To examine the spatial-temporal pattern of neuronal activity during the face perception in human brains,the scalp current density (SCD) analysis was applied to the visual evoked potentials (VEPs).Electroencephalograms (EEG) were recorded from 19 electrodes on the subjects scalp while the image of a human face or the tessellated image of the same one was presented 500 times each at frequency of 50％ in a random sequence.The SCD signals were computed from the EEG signals recorded for each of the image stimuli.And the SCD signals for the tessellated image were subtracted from those for the face image to extract components reflecting the processing/perception of the face image (referred to as the face component ).A similar experiment using the image of letter A,instead of human face,was also performed and the letter component was extracted by means of SCD signals.In the face component,the superior scalp current appeared in the right temporal region at 130-180 ms,and then moved alternately between the medial region and the occipital region at 220-300 ms after the onset of stimulation.On the other hand,in the letter component,a current source appeared at the bilateral temporal region at 180-220 ms after the stimulation onset,but disappeared afterwards.It was suggested that the method of SCD analysis we used here was effective to visualize the image processing/perception in human brains.
face perception scalp current density
T.Igasaki M.Hara N.Murayama Y.Hayashida
Kumamoto University,2-39-1 Kurokami Kumamoto 860-8555,Japan
国际会议
哈尔滨
英文
35-39
2008-01-13（万方平台首次上网日期，不代表论文的发表时间）