Visual motion sensitivity during eye movement: Investigating the interaction between retinal and extra-retinal noise. (360G-Wellcome-081581_Z_06_Z)

£135,799

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