Neuroscience 2004 Abstract
| Presentation Number: | 648.7 |
|---|---|
| Abstract Title: | Separable cortical maps underlie population responses to complex visual stimuli. |
| Authors: |
Baker, T. I.*1
; Issa, N. P.1
1Dept Physics, Univ Chicago, Chicago, IL |
| Primary Theme and Topics |
Sensory Systems - Vision -- Visual cortex: Functional organization and circuitry |
| Session: |
648. Visual Cortex: Population Dynamics and Synchrony Poster |
| Presentation Time: | Tuesday, October 26, 2004 10:00 AM-11:00 AM |
| Location: | San Diego Convention Center - Hall A-H, Board # AA9 |
| Keywords: | MOTION PERCEPTION, VISUAL CORTEX, MAPPING, ORIENTATION |
In the earliest cortical stages of visual processing, a scene is represented in different functional domains selective for specific image features. Maps of orientation and spatial frequency preference have been described in the primary visual cortex using simple sinusoidal grating stimuli. However, recent imaging experiments suggest that the maps of these two spatial parameters are not sufficient to describe patterns of activity generated in response to complex moving stimuli (Basole, et al. 2003). A model of cortical organization is presented in which temporal frequency tuning is superimposed on the maps of orientation and spatial frequency tuning previously measured in cat and ferret Area 17. The organization of temporal frequency tuning used in this model is based on measurements made in cat Area 17 that suggest temporal frequency preference and bandwidth vary in a subtle but systematic way across different spatial frequency domains (Zhang and Issa, SFN 2004).
The combined map of these three filtering properties is sufficient to quantitatively describe activity patterns in different orientation and spatial frequency domains measured in response to drifting complex images. The model correctly characterizes shifts in the orientation domains that are activated by drifting texture stimuli when the drift speed or drift angle changes. In addition, it predicts shifts in the activity of orientation domains consistent with the psychophysical perception of motion streaks. The model also predicts how activity in different spatial frequency domains shifts as the speed of a drifting image changes.
The agreement between model predictions and measurements suggests that the tangential organization of carnivore V1 can be described as a set of separable maps of orientation, spatial frequency and temporal frequency tuning properties.
The combined map of these three filtering properties is sufficient to quantitatively describe activity patterns in different orientation and spatial frequency domains measured in response to drifting complex images. The model correctly characterizes shifts in the orientation domains that are activated by drifting texture stimuli when the drift speed or drift angle changes. In addition, it predicts shifts in the activity of orientation domains consistent with the psychophysical perception of motion streaks. The model also predicts how activity in different spatial frequency domains shifts as the speed of a drifting image changes.
The agreement between model predictions and measurements suggests that the tangential organization of carnivore V1 can be described as a set of separable maps of orientation, spatial frequency and temporal frequency tuning properties.
Supported by Burroughs Wellcome Fund Interfaces Fellowship #1001774, Brain Research Foundation, Mallinckrodt Foundation
Sample Citation:
[Authors]. [Abstract Title]. Program No. XXX.XX. 2004 Neuroscience Meeting Planner. San Diego, CA: Society for Neuroscience, 2004. Online.
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