Neuroscience 2002 Abstract
| Presentation Number: | 556.20 |
|---|---|
| Abstract Title: | Dynamic Decorrelation: A Theory of Saccadic Effects on the visual Responses. |
| Authors: |
Dong, D. W.*1
1Center for Complex Systems and Brain Sciences, Florida Atlantic University, Boca Raton, FL |
| Primary Theme and Topics |
Sensory Systems - Vision -- Retina and photoreceptors |
| Secondary Theme and Topics | Motor Systems<br />- Oculomotor<br />-- Saccadic eye movement |
| Session: |
556. Vision: retina III Poster |
| Presentation Time: | Tuesday, November 5, 2002 4:00 PM-5:00 PM |
| Location: | Hall A2-B3 E-122 |
| Keywords: | EYE MOVEMENT, INFORMATION THEORY, OCULOMOTOR, SACCADE |
Purpose: Natural time-varying images possess significant temporal correlations which persist even after retinal processing. It has been shown that the LGN improves efficiency of visual representation through temporal decorrelation of the retinal signal (Dong and Atick 1995). But under natural viewing conditions, the temporal correlations are changed significantly by the saccadic eye movements and hence the visual signal sent to the LGN has quite different characteristics for the correlations during, across, and between saccadic eye movements.
Methods: Maintaining temporal decorrelation requires that the LGN response also changes according to saccade timing and duration. Based on the recently measured statistical properties of visual input during free viewing of natural time-varying images (Stringer and Dong 2002 SFN), we derive the dynamic temporal receptive-fields that achieve this decorrelation.
Results: During and right after a saccade, the predicted receptive-field behaves as a temporal low-pass filter; whereas between two saccades, the predicted receptive-field behaves as a temporal difference filter. The predicted filter between saccades agrees quantitatively with that measured in experiments. The predicted filter during saccades has a smaller response to a stimulus at certain midrange temporal frequencies.
Conclusion: The theory of efficient coding gives a quantitative account for why visual responses are different during and between saccades and are different at the center of the gaze and the periphery. It is further demonstrated on the cortical coding of higher order statistics (Dastjerdi and Do ng 2002 SFN).
.
Methods: Maintaining temporal decorrelation requires that the LGN response also changes according to saccade timing and duration. Based on the recently measured statistical properties of visual input during free viewing of natural time-varying images (Stringer and Dong 2002 SFN), we derive the dynamic temporal receptive-fields that achieve this decorrelation.
Results: During and right after a saccade, the predicted receptive-field behaves as a temporal low-pass filter; whereas between two saccades, the predicted receptive-field behaves as a temporal difference filter. The predicted filter between saccades agrees quantitatively with that measured in experiments. The predicted filter during saccades has a smaller response to a stimulus at certain midrange temporal frequencies.
Conclusion: The theory of efficient coding gives a quantitative account for why visual responses are different during and between saccades and are different at the center of the gaze and the periphery. It is further demonstrated on the cortical coding of higher order statistics (Dastjerdi and Do ng 2002 SFN).
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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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