Visual motion sensitivity during eye movement: Investigating the interaction between retinal and extra-retinal noise. (360G-Wellcome-081581_Z_06_Z)
Detecting and discriminating motion are primary tasks for the visual system. Success relies on the precision of neural estimates of visual motion. Precision is limited by variability in stimulation (external noise) and fluctuation in neuronal firing (internal noise). Traditional motion psychophysics concentrates on internal noise, emphasising the contribution made by image-motion sensors. This is largely because traditional psychophysical experiments prevent eye (and head) movement. Yet in norma l viewing we continually track objects by moving our eyes, which potentially increases noise in two additional ways: 1) externally, via the image motion generated by motor activity; 2) internally, via the extra-retinal motion signals estimating eye velocity. Extra-retinal motion signals originate in the motor system (motor commands, proprioception) and are used to transform image-motion information from an eye-centred to a head-centred coordinate frame. Extra-retinal signals converge on key moti on-processing centres in the cortex. The goal of the current proposal is to determine when combinations of motion-sensor and extra-retinal noise limit motion sensitivity during normal viewing behaviour. The work aims to establish fundamental principles in active motion psychophysics.
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Grant Details
Amount Awarded | 135799 |
Applicant Surname | Freeman |
Approval Committee | Cognitive and Higher Systems Funding Committee |
Award Date | 2007-02-06T00:00:00+00:00 |
Financial Year | 2006/07 |
Grant Programme: Title | Project Grant |
Internal ID | 081581/Z/06/Z |
Lead Applicant | Prof Tom Freeman |
Partnership Value | 135799 |
Planned Dates: End Date | 2012-09-30T00:00:00+00:00 |
Planned Dates: Start Date | 2007-11-01T00:00:00+00:00 |
Recipient Org: Country | United Kingdom |
Region | Wales |