[Structural differences of spatial-frequency filters in the cat visual cortex]

Sensitivity profiles of receptive fields (RF) of the cat's visual cortex along the width and length of the field were determined. They served as criteria for determining structural differences of the earlier discovered types of spatial-frequency filters. It has been shown that RF with spatial-frequency selectivity in a narrow range of orientations close to the preferable one, have the "one-dimensional" sensitivity profiles in the same range. For RF showing spatial-frequency selectivity along the RF length and width two-dimensional sensitivity profiles along these RF dimensions were revealed. A group of fields was found whose pattern of sensitivity profiles depended on the geometrical properties of images which stipulated the functional changes o RF filtering properties. Possible role of different types of spatial-frequency filters in image processing is discussed.