Contextual influences on orientation perception (360G-Wellcome-081114_Z_06_Z)

£58,939

We propose to investigate contextual influences on visual perception, using orientation as a key example. Orientation perception has a long and distinguished experimental history, but most previous investigations of visual context have used either a psychophysical or a computational perspective. Support from the Foresight Project will help forge a link between these two disciplines. When an oriented line segment appears in an array of other oriented line segments, three well-known phenomena typically occur. One is the tilt illusion: an exaggeration of the difference between the orientations of adjacent line segments. The second is acuity loss: it becomes more difficult to identify the orientation of any individual line segment. The third is facilitation: a low-contrast target becomes easier to see when aligned with high-contrast flanks. (NB: Certain viewing conditions produce the opposite effects.) Various mathematical and computational models have been suggested to account for each of these contextual effects, but no model has yet to account for all of them. The initial focus of our research will be to collect experimental results against which the predictions of these models can be tested. Existing models can then be refined or replaced in the light of our results.

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Grant Details

Amount Awarded 58939
Applicant Surname Kerley
Approval Committee Cognitive and Higher Systems Funding Committee
Award Date 2006-07-04T00:00:00+00:00
Financial Year 2005/06
Grant Programme: Title Project Grant
Internal ID 081114/Z/06/Z
Lead Applicant Dr Simon Kerley
Other Applicant(s) Dr Zhaoping Li, Prof Michael Morgan, Prof Peter Dayan
Partnership Name Cognitive Systems
Partnership Value 58939
Planned Dates: End Date 2009-12-31T00:00:00+00:00
Planned Dates: Start Date 2007-01-01T00:00:00+00:00
Recipient Org: Country United Kingdom
Region East of England