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A Nonlinear Analysis of Event-Related Brain Potentials of the Thatcher Illusion

Author: LiYang
Tutor: ZhuZuoSheng
School: Shanghai Jiaotong University
Course: Biomedical Engineering
Keywords: Face perception Event-related potentials Thatcher optical illusion Structural information processing Wavelet Entropy
CLC: R318
Type: Master's thesis
Year: 2007
Downloads: 63
Quote: 0
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Abstract


Thatcher optical illusion , one of the eyes and mouth partially inverted faces look very strange , but then the whole face upside down after no longer feels so strange . Behavioral studies have shown that the anteroposterior rendered Thatcher faces destroyed perceptual process of the partial structure of information , while the inverted rendering normal face is the destruction process of the global structure information . The recorded normal subjects during face perception processes EEG analysis of the wavelet entropy change , and related components of the event-related potentials to judge faces flip Thatcher of whether affect the same neural mechanism. The subjects in the observation under eight different conditions ( anteroposterior and inverted , with Thatcher , male and female ) faces , also requires judgment task faces the direction . The experimental results show that the Thatcher of the anteroposterior stimulate prolonged incubation period of the N170 wave and inverted stimulation of the opposite , which prove that the global structure of information processing and the local structure information processing is separate . Thatcher of the inverted stimulus also reduces the P1 wave , indicating that the local structure of information processing is more active in the face flip . This paper further Thatcher of inversion stimulation reduced wavelet entropy shows the change of the local structure information frequency modulation of event-related potentials . Finally , windowed wavelet entropy studies have shown that the local structure information processing started earlier , and the global structure of the information processing is mainly active in the N170 wave within . More detailed description of the face structure information processing mechanism , wavelet entropy is the appropriate method of analysis of event-related potentials , and be able to bring a new direction for the cognitive process research .

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CLC: > Medicine, health > Basic Medical > Medical science in general > Biomedical Engineering
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