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Comparing the effect of the interaction between fine and coarse scales and surround suppression on motion discrimination

Lookup NU author(s): Dr Ignacio Serrano-Pedraza, Professor Andrew Derrington

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Abstract

Our ability to discriminate motion direction in a Gabor patch diminishes with increasing size and contrast, indicating surround suppression. Discrimination is also impaired by a static low-spatial-frequency patch added to the moving stimulus, suggesting an antagonism between sensors tuned to fine and coarse features. Using Bayesian staircases, we measured duration thresholds in motion-direction discrimination tasks using vertically oriented Gabor patches moving at 2 degrees/s. In two experiments, we tested two contrasts (2.8% and 46%), five window sizes (from 0.7 degrees to 5 degrees), and two spatial frequencies (1 c/deg and 3 c/deg), either presented alone or added to a static pattern. When the moving pattern was presented alone, duration thresholds increased with size at high contrast and decreased with size at low contrast. At low contrast, when a static pattern of 3 c/deg was added to a moving pattern of 1 c/deg, duration thresholds were similar to the case when the moving pattern was presented alone; however, at high contrast, duration thresholds were facilitated, eliminating the effect of surround suppression. When a static pattern of 1 c/deg was added to a moving pattern of 3 c/deg, duration thresholds increased about 4 times for high contrast and 2 times for low contrast. These results show that the antagonism between sensors tuned to fine and coarse scales is more complex than surround suppression, suggesting that it reflects the operation of a different mechanism.


Publication metadata

Author(s): Serrano-Pedraza I; Derrington AM; Gamonoso-Cruz MJ; Sierra-Vazquez V

Publication type: Article

Publication status: Published

Journal: Journal of Vision

Year: 2013

Volume: 13

Issue: 11

Print publication date: 10/09/2013

Acceptance date: 01/08/2013

ISSN (electronic): 1534-7362

Publisher: Association for Research in Vision and Ophthalmology

URL: http://dx.doi.org/10.1167/13.11.5

DOI: 10.1167/13.11.5


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