Spatiotemporal Brain Activities on Recognizing Ambiguous Picture -In Case of Saxophone Player and Girl’s Face-

Abstract

The authors have measured electroencephalograms (EEGs) from subjects observing four images of ambiguous pictures. The equivalent current dipole source localization (ECDL) method has been applied to those event related potentials (ERPs): averaged EEGs. The paper reports the comparison results of “Saxophone player and Girl’s face.” In case of Girl’s face, reaction time on each part is earlier and process duration is shorter than that of Saxophone player. Especially in case of Girl’s face, ECDs were localized to the right and the left angular gyrus (AnG) around 370ms, and to the right post central gyrus (PstCG) around 415ms, then by way of language areas, ECDs were localized again to the right and the left AnG around 520ms. By our precedent researches, activities on the angular gyrus (AnG) are important to discriminate of the presented images.