Award details

Putting it back together: combining edges into features in mid-level visual processing

Reference	BB/C50289X/1
Principal Investigator / Supervisor	Dr Jonathan Peirce
Co-Investigators / Co-Supervisors
Institution	University of Nottingham
Department	Sch of Psychology
Funding type	Research
Value (£)	231,245
Status	Completed
Type	Research Grant
Start date	01/01/2005
End date	31/12/2007
Duration	36 months

Abstract

We know that signals from the retinal photoreceptors are combined to form the antagonistic centre-surround receptive fields of ganglion cells. We know that these, in turn, are combined after the lateral Geniculate Nucleus to form oriented, spatial-frequency selective receptive fields in primary visual cortex. To progress in our understanding of visual processing we need to know how those signals are subsequently combined. This project will draw on psychophysical studies, single-unit recordings and computational modelling in order to achieve its goals. The psychophysics will inform us of the presence and broad nature of the mechanisms of combination. It will show us whether there are visual processing mechanisms selective to particular compounds of Fourier energy. Single-unit studies will determine the precise combination rules by which the signals are processed, that is how those mechanisms achieve their selectivity. All of the experiments will be driven by, and then compared with, computer simulations. Furthermore, by analysing the frequency of occurrence of particular compounds of Fourier energy in natural scenes and measuring experimentally the strength of selective coding for more common and less common pairings, we will also determine the extend to which mid-level vision is optimised for the real visual world.

Summary

unavailable

Committee	Closed Committee - Animal Sciences (AS)
Research Topics	X – not assigned to a current Research Topic
Research Priority	X – Research Priority information not available
Research Initiative	X - not in an Initiative
Funding Scheme	X – not Funded via a specific Funding Scheme

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