Neuroscience 2002 Abstract
| Presentation Number: | 265.6 |
|---|---|
| Abstract Title: | Source separation in natural time-varying images near center of the gaze and near the periphery. |
| Authors: |
Dastjerdi, M.*1
; DONG, D. W.1
1Center for Complex Systems and Brain Sciences, Florida Atlantic University, Boca Raton, FL |
| Primary Theme and Topics |
Sensory Systems - Vision -- Striate visual cortex: Orientation, form and color |
| Secondary Theme and Topics | Motor Systems<br />- Oculomotor<br />-- Saccadic eye movement |
| Session: |
265. Oculomotor: saccades Poster |
| Presentation Time: | Monday, November 4, 2002 9:00 AM-10:00 AM |
| Location: | Hall A2-B3 F-72 |
| Keywords: | INFORMATION THEORY, EYE MOVEMENT, SACCADE, OCULOMOTOR |
Purpose: We want understand the relationship between the response properties of visual neurons and the statistical structure of natural time-varying images. Beyond the second order statistics (Stringer and Dong 2002 SNF, Dong 2002 SFN), it is interesting to learn the higher order ones. In the previous studies, movies or images form camera or camcorders were used, which at most simulating the periphery inputs. However, it is likely that the statistical structures of time-varying images viewed by real human subjects especially at the center of the gaze are very different from those.
Method: Saccadic eye movements provide huge variations in spatio-temporal inputs and the tracking of moving objects keeps the image near the center of the gaze stabilized during fixations and smooth pursuits. These properties make the time-varying images near the center of the gaze different from the periphery. In this study, higher order of statistics of time-varying natural images near the center of the gaze and near the periphery are studied by decomposing into their independent components.
Results: The statistical structure of these two inputs are different. Higher velocity components are observed more frequently in the periphery than in the center of the gaze. Moreover, the higher velocity structures have larger spatial scales than the low velocity ones. On the other hand the stationary patterns are observed more often in the center of the gaze than in the periphery.
Conclusion: Our studies suggest that different velocity and spatial resolution components on the center of the gaze and the periphery are consistent with physiology of vision.
.
Method: Saccadic eye movements provide huge variations in spatio-temporal inputs and the tracking of moving objects keeps the image near the center of the gaze stabilized during fixations and smooth pursuits. These properties make the time-varying images near the center of the gaze different from the periphery. In this study, higher order of statistics of time-varying natural images near the center of the gaze and near the periphery are studied by decomposing into their independent components.
Results: The statistical structure of these two inputs are different. Higher velocity components are observed more frequently in the periphery than in the center of the gaze. Moreover, the higher velocity structures have larger spatial scales than the low velocity ones. On the other hand the stationary patterns are observed more often in the center of the gaze than in the periphery.
Conclusion: Our studies suggest that different velocity and spatial resolution components on the center of the gaze and the periphery are consistent with physiology of vision.
.
Supported by NIMH 1151-019-42, FAU RIA-25
Sample Citation:
[Authors]. [Abstract Title]. Program No. XXX.XX. 2002 Neuroscience Meeting Planner. Orlando, FL: Society for Neuroscience, 2002. Online.
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