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Visualizing Visual Adaptation
Published on: April 24, 2017
Cross-orientation masking in human color vision
José M Medina1, Kathy T Mullen
1McGill Vision Research, Department of Ophthalmology, McGill University, Montreal, Quebec, Canada. jmanuel@fisica.uminho.pt
Journal of Vision
|September 18, 2009
Summary
Color significantly enhances cross-orientation masking (XOM), a visual phenomenon where detecting one pattern is harder with a similar orthogonal pattern present. This chromatic masking is distinct from achromatic masking, suggesting different visual processing pathways.
Area of Science:
- Visual perception
- Neuroscience
- Color vision
Background:
- Cross-orientation masking (XOM) impairs Gabor pattern detection when a similar orthogonal pattern is present.
- Previous research suggests XOM involves orientationally selective mechanisms, particularly in cortical pathways.
- The role of color in XOM and its underlying physiological mechanisms remain less understood.
Purpose of the Study:
- To investigate the influence of color on cross-orientation masking.
- To compare chromatic masking with achromatic masking across various visual parameters.
- To elucidate the distinct physiological origins of chromatic and achromatic XOM.
Main Methods:
- Measured contrast detection thresholds for horizontally oriented Gabor patterns.
- Compared red-green chromatic masking against achromatic masking.
- Varied spatial frequencies, temporal frequencies, orientations, and mask contrasts.
Main Results:
- Chromatic cross-orientation masking was significantly stronger than achromatic masking.
- Chromatic masking proved invariant to spatio-temporal conditions, unlike achromatic masking.
- Chromatic masking was isotropic, while achromatic masking showed orientation tuning.
Conclusions:
- The P cell pathway can support cross-orientation masking.
- Chromatic and achromatic masking likely originate from distinct physiological pathways.
- Chromatic masking may involve predominantly cortical sites, contrasting with subcortical M cell influences on achromatic masking.
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