Neuroscience 2000 Abstract
| Presentation Number: | 593.8 |
|---|---|
| Abstract Title: | Differential activity to surfaces defined by visual motion in human cortical areas. |
| Authors: |
Jiang, Y.*1
; Parasuraman, R.2
; Kastner, S.1
; Haxby, J. V.1
1Laboratory of Brain & Cognition, Natl Inst of Mental Health, Bethesda, MD 2Cognitive Science Laboratory, Catholic University of America, District of Columbia, DC |
| Primary Theme and Topics |
F. Sensory Systems - 80. Visual cortex: extrastriate |
| Secondary Theme and Topics | I. Neural Basis of Behavior<br />- 108. Learning and memory: physiology |
| Session: |
593. Visual cortex: extrastriate--motion and depth Slide |
| Presentation Time: | Wednesday, November 8, 2000 9:45 AM-10:00 AM |
| Location: | Room 288 |
| Keywords: |
Visual motion provides a powerful cue for identifying the surfaces of three-dimensional visual objects. Using functional magnetic resonance imaging (MRI) of the human brain, we found that occipital cortex, the motion processing area MT/MST, and intraparietal cortex are involved in the representation of motion-defined curved and flat surfaces. Additionally, neural responses associated with the perception of motion-defined curved and flat surfaces differed more in early visual cortex than in the MT/MST complex (Jiang et al, 1999). To investigate whether the differential responses to curved and flat motion-defined surfaces are restricted to a subset of early visual cortical areas, we examined activations in occipital cortex partitioned by retinotopically-defined visual areas. We found strong differential activations to motion-defined curved and flat surfaces in V1 and V2 in all three subjects examined (P < .05), but not in areas V3 and V4 (P > .4), even though neurons in these areas have much larger receptive fields (P < .05 for interaction between surface type and visual area). Moreover, the mean enhanced MR responses to motion-defined curved surfaces in intraparietal cortex were found to be stronger than those to flat surfaces (P < .05 for left and right intraparietal cortex). These results indicate that the cortical representation of curved and flat surfaces defined by motion occurs as early as V1/V2, and that top-down feedback from MT/MST and intraparietal cortex affects responses in V1/V2 more than subsequent visual areas in the visual processing hierarchy.
Sample Citation:
[Authors]. [Abstract Title]. Program No. XXX.XX. 2000 Neuroscience Meeting Planner. New Orleans, LA: Society for Neuroscience, 2000. Online.
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