Neuroscience 2005 Abstract
| Presentation Number: | 46.18 |
|---|---|
| Abstract Title: | Cue invariance in V4 for static and moving shapes. |
| Authors: |
Mysore Gopalrao, S.*1
; Raiguel, S.1
; Vogels, R.1
; Orban, G. A.1
1Lab.Neuro & Psychofysiol, K.U. Leuven Med. School, Leuven, Belgium |
| Primary Theme and Topics |
Sensory and Motor Systems - Vision -- Processing of contrast, orientation, form, and color |
| Session: |
46. Objects and Faces I Poster |
| Presentation Time: | Saturday, November 12, 2005 2:00 PM-3:00 PM |
| Location: | Washington Convention Center - Hall A-C, Board # K11 |
| Keywords: | RELATIVE MOTION, KINETIC BOUNDARY, SINGLE NEURONS |
Previous reports have shown cue-invariant shape selectivity in infero-temporal neurons of macaques (Sary et al. Science, 1993; Vogels R and Orban GA Prog Br Res, 1996) including static shapes defined by relative motion. We have previously shown that even dorsal V4 neurons reflect this kind of cue-invariant form processing (Mysore SG et al. SFN abstr, 2003). Since moving kinetic boundaries are a more natural stimulus, the current study explored selectivity for luminance or motion-defined shapes when the shape boundary was either static or moving. We used a factorial design where the cues defining the 5 test shapes consisted of luminance, or pixel motion inside the shape boundary (factor 1). Shapes themselves were either static or moving (factor 2). Additionally, we included a 5th set of static shapes as in our previous experiment (Mysore SG et al . SFN abstr, 2003) defined by pixel motion in opposite directions on either side of the boundary, to compare shape selectivity across cues. We recorded from 96 single neurons in dorsal V4 of an awake, behaving rhesus monkey. Shape had an effect in a sizable proportion of the population (30/96). Our results show that the vast majority of shape selective neurons (25/30) had similar shape preferences whether the shape was defined by luminance or by motion cues. These shape selective neurons retained their shape preference whether the shape boundary itself was static or moving. Further, shape preferences for 15/17 cells which were selective for the 5th set of static kinetic figures were similar to those for luminance and pixel motion defined shapes. The present study shows that shape selective neurons in dorsal V4 retain their shape preference whether the cue is luminance or motion contrast, whether the boundary defining the shape is moving or static, and when the boundary is defined by opposite directions of motion.
Supported by GOA/2005/18 & GSKE
Sample Citation:
[Authors]. [Abstract Title]. Program No. XXX.XX. 2005 Neuroscience Meeting Planner. Washington, DC: Society for Neuroscience, 2005. Online.
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