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The effect of disrupting the human magnocellular pathway on global motion perception Hoag, Ryan Alexander
Abstract
Purpose: To determine the effect of human magnocellular (M) pathway disruption on global motion perception. Method: Thirty adults completed a global motion task under four conditions. The task was completed after adaptation to full-field sinusoidal flicker (experimental condition #1), after adaptation to a gray field (control condition #1), in the presence of a red background (experimental condition #2) and in the presence of a gray background (control condition #2). Based on lesion studies and the physiological properties of single cells in the subcortical M pathway, it was predicted that the psychophysical techniques use in both experimental conditions would disrupt normal functioning of this pathway and result in elevated motion coherence thresholds. Results: Adaptation to flicker and the presence of a red background increased motion coherence thresholds. The threshold elevation was greater when participants were adapted to flicker. Conclusion: Flicker adaptation and the presence of a red background are assumed to temporarily disrupt the M pathway at a subcortical level. The fact that these techniques elevate motion coherence thresholds suggests that the subcortical M pathway is needed for normal human motion perception.
Item Metadata
Title |
The effect of disrupting the human magnocellular pathway on global motion perception
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
2003
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Description |
Purpose: To determine the effect of human magnocellular (M) pathway disruption on global motion perception. Method: Thirty adults completed a global motion task under four conditions. The task was completed after adaptation to full-field sinusoidal flicker (experimental condition #1), after adaptation to a gray field (control condition #1), in the presence of a red background (experimental condition #2) and in the presence of a gray background (control condition #2). Based on lesion studies and the physiological properties of single cells in the subcortical M pathway, it was predicted that the psychophysical techniques use in both experimental conditions would disrupt normal functioning of this pathway and result in elevated motion coherence thresholds. Results: Adaptation to flicker and the presence of a red background increased motion coherence thresholds. The threshold elevation was greater when participants were adapted to flicker. Conclusion: Flicker adaptation and the presence of a red background are assumed to temporarily disrupt the M pathway at a subcortical level. The fact that these techniques elevate motion coherence thresholds suggests that the subcortical M pathway is needed for normal human motion perception.
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2393679 bytes
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File Format |
application/pdf
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Language |
eng
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Date Available |
2009-10-21
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0091040
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Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
2003-05
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.