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Author Spotlight: Assessment of Visual Acuity in Central Vision Loss Through Motion-Based Peripheral Vision Testing

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Published on: February 23, 2024

Non-retinotopic adaptive center-surround modulation in motion processing.

Boris Peñaloza¹, Michael H Herzog², Haluk Öğmen¹

¹Perceptual and Cognitive Dynamics Laboratory, Department of Electrical & Computer Engineering, University of Denver, Denver, CO 80208, USA.

Vision Research

|June 8, 2020

Summary

Motion perception uses non-retinotopic coordinates. This study shows that non-retinotopic motion processing relies on an adaptive center-surround mechanism, similar to retinotopic processing.

Keywords:

Adaptive center-surround mechanisms Ecological vision Motion detection Motion perception Non-retinotopic processes Reference-frames

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Area of Science:

Neuroscience
Visual Perception
Computational Neuroscience

Background:

The early visual system is retinotopically organized, mapping visual input based on retinal location.
Ecological viewing conditions reveal that motion perception operates in non-retinotopic coordinates, independent of retinal position.
While non-retinotopic motion processing is crucial, its underlying mechanisms and neural correlates remain largely unknown.

Purpose of the Study:

To investigate whether the non-retinotopic system processing motion information utilizes an adaptive center-surround mechanism.
To test the hypothesis that non-retinotopic motion perception is mediated by adaptive center-surround interactions.

Main Methods:

Utilized the Ternus-Pikler display, a paradigm capable of establishing either retinotopic or non-retinotopic reference frames.
Manipulated stimulus properties (contrast and spatial size) to probe motion-direction discrimination under different reference frames.
Compared behavioral responses to assess the influence of stimulus characteristics on motion perception.

Main Results:

Findings suggest that non-retinotopic motion perception is influenced by stimulus size and contrast in a manner consistent with center-surround interactions.
The observed effects align with an adaptive center-surround antagonism model, where stimulus contrast modulates the balance between excitatory and suppressive surround mechanisms.
Behavioral data supports the hypothesis that non-retinotopic motion processing employs a similar adaptive mechanism to retinotopic processing.

Conclusions:

Non-retinotopic motion perception is mediated by an adaptive center-surround mechanism.
This mechanism appears analogous to the one proposed for retinotopic motion processing, suggesting a shared computational principle.
Understanding these non-retinotopic mechanisms is vital for comprehending visual perception in naturalistic environments.