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Related Experiment Video

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Perceptual and Category Processing of the Uncanny Valley Hypothesis' Dimension of Human Likeness: Some Methodological Issues

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Published on: June 3, 2013

Texture-surround suppression of contour-shape coding in human vision.

Frederick A A Kingdom¹, Nicolaas Prins

¹epartment of Ophthalmology, McGill University, McGill Vision Research, Quebec, Canada. fred.kingdom@mcgill.ca

|October 15, 2008

Summary

Nearby parallel textures inhibit the visual cortex

Area of Science:

Neuroscience
Visual Perception
Computational Neuroscience

Background:

Contextual influences on visual cortex neurons are poorly understood.
Previous studies used simple visual stimuli.

Purpose of the Study:

Investigate how texture orientation affects contour shape coding.
Understand the functional role of contextual influences in the visual cortex.

Main Methods:

Utilized a novel visual after-effect paradigm.
Employed psychophysical methods to assess shape perception.
Tested the impact of parallel and orthogonal texture orientations.

Main Results:

Perceived shape coding is inhibited by nearby parallel texture orientations.

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Orthogonal texture orientations did not show an inhibitory effect.

Demonstrated psychophysically that contour shape processing is orientation-dependent.

Conclusions:

Neurons in the primary visual cortex are suppressed by parallel orientations.
These suppressed neurons likely influence higher visual areas involved in shape and object recognition.
Contextual modulation by texture orientation plays a role in visual processing.