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Spatiotemporal Activities in Human Brain During Recognizing Ambiguous Figure

Authors:
Takahiro Yamanoi
Tomoko Yonemura
Hisashi Toyoshima
Yahachiro Tsukamoto
Shin-ich Ohnishi

Keywords: Electro-encephalogram; Electro-encephalogram; Equivalent Current Dipole Localization Method; Ambiguous Pictures; Brain Activity.

Abstract:
To treat higher order brain dysfunction, it is neces- sary to identify the location of each function. In Japan, a super- aging society is progressing, and many dysfunctions such as cer- ebral infarction has been occurred. The fMRI analysis is not enough to identify the position of dysfunction in detail. The au- thors had tried to elucidate higher order brain functions. In the paper, the authors have measured electroencephalograms (EEGs) from subjects (M.K and R. E.) who were observing four images of ambiguous monochrome line pictures. The equivalent current dipole source Localization (ECDL) method has been ap- plied to those Event Related Potentials (ERPs): averaged EEGs. The paper reports the comparison results of “Saxophone player and Girl’s face.” In the case of the Saxophone player, the pro- cess was done over a latency from 400ms to 1000ms, however for the Girl’s face image, the corresponding process was com- pleted relatively quickly and ended the latency around 800ms. Especially in the 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. It has been clarified in our previous study that activities on the angular gyrus (AnG) are important to discriminate the unusual shape of presented images. This fact is confirmed also in this work.

Pages: 43 to 46

Copyright: Copyright (c) IARIA, 2019

Publication date: November 24, 2019

Published in: conference

ISSN: 2519-8491

ISBN: 978-1-61208-759-7

Location: Valencia, Spain

Dates: from November 24, 2019 to November 28, 2019