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Role of low and high spatial frequencies in the face-selective responses of neurons Representation

By E. T. Rolls, C. C. Baylis and Cl M. Leonard

Abstract

Abstract-There are neurons in the cortex in the anterior part of the superior temporal sulcus of the macaque monkey with visual responses selective for faces. One aim of the present study was to analyze further the information which leads them to respond, by measuring their responses to parametrically filtered stimuli. The responses of 32 such single neurons were measured to faces which were digitized, lowpass filtered at spatial frequencies of 2, 4, 8,... 128 cycles/face, highpass filtered at frequencies of 4, 8,..64 cycles/face, and presented in random sequence using a video framestore. It was found that many of the neurons could respond to blurred images of faces, with a mean frequency at half-maximum amplitude of the neuronal response to the series of lowpass filtered images of faces of 3.3 cycles/face. Almost all the neurons had lowpass cutoff frequencies defined in this way below 8 cycles/face. Many of the neurons could also respond to images of faces in which the only information remaining was a limited amount of high spatial frequency edge info~ation. The mean frequency at half-maximum amplitude of the neuronal response to the series of highpass filtered images of faces was 29.7cycIes/face. Almost all the neurons had highpass cutoff frequencies above 8 cycles/face. Thus, many of the neurons could respond to a towpass and a highpass filtered image ofa face even when these had no spatial frequencies in common. The mean separation between the lowpass and highpass cutoff frequencies was 3.2 octaves. Fo

Year: 1985
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