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ISSN : 1226-9654

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Vol.18 No.4

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Similarity of Spatial Frequency Selectivity between First- and Second-order Texture Mechanisms

The Korean Journal of Cognitive and Biological Psychology / The Korean Journal of Cognitive and Biological Psychology, (P)1226-9654; (E)2733-466X
2006, v.18 no.4, pp.325-338

(2006). Similarity of Spatial Frequency Selectivity between First- and Second-order Texture Mechanisms. The Korean Journal of Cognitive and Biological Psychology, 18(4), 325-338.

Abstract

It has been well known that there are two kinds of texture segregation mechanisms; first-order texture detecting mechanism of linear processing, and second-order mechanism of nonlinear processing. The importance of spatial frequency selectivity has been demonstrated in constructing higher level of pattern perception from local texture segregated area. This study using a probability distribution space consisted of independent mean and variance dimensions measured segregation thresholds of various directions of texture pairs in space. Five spatial frequencies were applied to each direction respectively. In this space, two mechanisms were confirmed as previous studies identified; one was luminance-sensing, the other was negatively rectifying, luminance-and-contrast-sensing. Their thresholds varied similarly across the spatial frequencies, were peak at the same spatial frequencies, 1.16 cycles/degree. When an identical stimulus pattern was prepared to measure first- and second-order texture properties, similar selectivity of spatial frequency between two mechanisms was observed. It was discussed that two stage model could be used for the observed similarity of spatial frequencies between two texture detection mechanisms and general notion of second-order filter's tuning to lower spatial frequency than first-order.

keywords
결, 일차 결 분리, 이차 결 분리, 대비민감도함수, 공간주파수, texture segregation, first-order texture, second-order texture, contrast sensitivity function, spatial frequency

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