Optimal spatial frequencies for discrimination of motion direction in optic flow patterns

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Spatial frequency tuning functions were measured for direction discrimination of optic flow patterns. Three subjects discriminated the direction of a curved motion path using computer generated optic flow patterns composed of randomly positioned dots. Performance was measured with unfiltered patterns and with patterns that were spatially filtered across a range of spatial frequencies (center spatial frequencies of 0.4, 0.8, 1.6, 3.2, 6.4, and 9.6 c/deg). The same; subjects discriminated the direction of uniform, translational motion on the fronto-parallel plane. The uniform motion patterns were also composed of randomly positioned dots, that were either unfiltered or filtered with the same spatial filters used for the optic flow patterns. The peak spatial frequency was the same for-both the optic flow and uniform motion patterns. For both types of motion, a narrow band (1.5 octaves) of optimal spatial frequencies was sufficient to support the same level of performance as found with unfiltered, broadband patterns. Additional experiments demonstrated that the peak spatial frequency for the optic flow patterns varies with mean image speed in the same manner as has been reported for moving sinusoidal gratings. These findings confirm the hypothesis that the outputs of the local motion mechanisms thought to underlie the perception of uniform motion provide the inputs to, and constrain the operation of, the mechanism that processes self motion from optic flow patterns. (C) 1999 Elsevier Science Ltd. All rights reserved.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
1999-09
Language
English
Article Type
Article
Keywords

SUPERIOR TEMPORAL AREA; SELF-MOTION; MACAQUE MONKEY; EYE-MOVEMENTS; EXPANSION CONTRACTION; ROTATION CELLS; MST NEURONS; DORSAL PART; PERCEPTION; SELECTIVITY

Citation

VISION RESEARCH, v.39, no.19, pp.3175 - 3185

ISSN
0042-6989
DOI
10.1016/S0042-6989(99)00024-3
URI
http://hdl.handle.net/10203/74877
Appears in Collection
HSS-Journal Papers(저널논문)
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