Responses of complex cells in cat area 17 to apparent motion of random pixel arrays

The characteristics of directionally selective cells in area 17 of the cat are studied using moving random pixel arrays (RPAs) with 50% white and 50% black pixels. The apparent motion stimulus is similar to that used in human psychophysics [Fredericksen et al. (1993). Vision Research, 33, pp. 1193-1...

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Bibliographic Details
Published in:Vision research (Oxford) 1997-04, Vol.37 (7), p.839-852
Main Authors: VAN WEZEL, R. J. A, LANKHEET, M. J. M, FREDERICKSEN, R. E, VERSTRATEN, F. A. J, VAN DE GRIND, W. A
Format: Article
Language:English
Subjects:
Animals
Behavioral psychophysiology
Biological and medical sciences
Brain Mapping
Cats
Electrophysiology
Evoked Potentials, Visual
Female
Fundamental and applied biological sciences. Psychology
Male
Motion Perception - physiology
Optical Illusions - physiology
Pattern Recognition, Visual - physiology
Psychology. Psychoanalysis. Psychiatry
Psychology. Psychophysiology
Space life sciences
Time Factors
Visual Cortex - physiology
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Summary:The characteristics of directionally selective cells in area 17 of the cat are studied using moving random pixel arrays (RPAs) with 50% white and 50% black pixels. The apparent motion stimulus is similar to that used in human psychophysics [Fredericksen et al. (1993). Vision Research, 33, pp. 1193-1205]. We compare motion sensitivity measured with single-step pixel lifetimes and unlimited pixel lifetimes. A motion stimulus with a single-step pixel lifetime contains directional motion energy primarily at one combination of spatial displacement and temporal delay. We recorded the responses of complex cells to different combinations of displacement and delay to describe their spatio-temporal correlation characteristics. The response to motion of RPAs with unlimited lifetime is strongest along the preferred speed line in a delay vs displacement size diagram. When using an RPA with a single-step pixel lifetime, the cells are responsive to a much smaller range of spatial displacements and temporal delays of the stimulus. The maximum displacement that still gives a directionally selective response is larger when the preferred speed of the cell is higher. It is on average about three times smaller than the receptive field size.
ISSN:0042-6989
1878-5646
DOI:10.1016/S0042-6989(96)00248-9