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ISSN : 1226-9654

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Vol.16 No.3

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Selective activation of human brain areas to global contour-local feature information in face reconition: an fMRI study

The Korean Journal of Cognitive and Biological Psychology / The Korean Journal of Cognitive and Biological Psychology, (P)1226-9654; (E)2733-466X
2004, v.16 no.3, pp.337-352
(KAIST)

F. Wilkinson
H. R. Wilson
F., W. , & H., R. W. (2004). Selective activation of human brain areas to global contour-local feature information in face reconition: an fMRI study. The Korean Journal of Cognitive and Biological Psychology, 16(3), 337-352.

Abstract

One of the controversial issues on face recognition is whether faces are recognized as undifferentiated wholes or in terms of their constituent parts, namely, global vs local information processing for face recognition. However, it has been recently proposed that global coding and local processing constitute dual routes to face recognition. To investigate this dual routs processing hypothesis, we directly examined the selective activation of human brain areas with fMRI measurements to the synthetic face stimuli composed of radial frequency components, which had an advantage to easily separate the global contour and local basic feature information of face. In experiment 1, we found that FFA was activated to face contour and feature information. More importantly, it was observed that the strength of activation to contour information was higher than to feature information in FFA. In experiment 2, we also found that the global processing of face contour information was involved mainly in encoding processing, not in retrieval processing. Strong activations of the prefrontal region (BA10) and the cingulate gyrus (BA 32) were observed during encoding processing of face feature information. These results altogether add to our understanding of the characteristics of dual routes processing in face recognition. In addition, these results suggest that the contour information of face stimulus is processed through a bottom-up processing whereas the feature information is processed through a top-down processing.

keywords
face recognition, global-local information, synthetic face, fMRI, FFA, dual routes processing, 얼굴인식, 전체-국소정보, 합성얼굴, fMRI, FFA, 이중경로처리, face recognition, global-local information, synthetic face, fMRI, FFA, dual routes processing

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