| EPSRC Reference: |
GR/S74515/01 |
| Title: |
Suppression & Summation in Contrast Gain Control for Human Vision |
| Principal Investigator: |
Meese, Professor T |
| Other Investigators: |
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| Researcher Co-Investigators: |
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| Project Partners: |
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| Department: |
Sch of Life and Health Sciences |
| Organisation: |
Aston University |
| Scheme: |
Standard Research (Pre-FEC) |
| Starts: |
02 September 2004 |
Ends: |
01 February 2008 |
Value (£): |
236,060
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| EPSRC Research Topic Classifications: |
| Vision & Senses - ICT appl. |
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Summary on Grant Application Form |
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One of the most important aspects of the visual signal received by the human visual system is contrast - the spatial variation of luminance across the retina. In primate vision, contrast gain controls shift the operating characteristic of contrast sensitive neural mechanisms. There is abundant evidence for this from both single-unit physiology and psychophysical experiments in humans. Contrast suppression refers to the reduction in signal level produced by one stimulus on another. It could arise from several sources including static contrast nonlinearities and inhibition. Masking and adaptation refer to the psychophysical interference produced by one stimulus on another. They are characterised by a worsening of the signal to noise ratio, perhaps due to suppression or multiplicative noise. Contrast summation refers to the sensory integration of stimulus contrast. This can occur in the signal pathway and the suppression pathway(s). In principle, both suppression and summation could occur within the pathway of an individual eye (monocular), between the two eyes (interocular/dichoptic) or after the combination of the pathways from the two eyes (binocular). This project will develop an integrative systems model of adaptation, suppression and summation, and test it quantitatively in computer-controlled psychophysical experiments.
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Key Findings |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Potential use in non-academic contexts |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Impacts |
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| Description |
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk |
| Summary |
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| Date Materialised |
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Sectors submitted by the Researcher |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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| Project URL: |
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| Further Information: |
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| Organisation Website: |
http://www.aston.ac.uk |