On the decline of 1st and 2nd order sensitivity with eccentricity
On the decline of 1st and 2nd order sensitivity with eccentricity
We studied the relationship between the decline in sensitivity that occurs with eccentricity for stimuli of different spatial scale defined by either luminance (LM) or contrast (CM) modulation. We show that the detectability of CM stimuli declines with eccentricity in a spatial frequency-dependent manner, and that the rate of sensitivity decline for CM stimuli is roughly that expected from their 1st order carriers, except, possibly, at finer scales. Using an equivalent noise paradigm, we investigated the possible reasons for why the foveal sensitivity for detecting LM and CM stimuli differs as well as the reason why the detectability of 1st order stimuli declines with eccentricity. We show the former can be modeled by an increase in internal noise whereas the latter involves both an increase in internal noise and a loss of efficiency. To encompass both the threshold and suprathreshold transfer properties of peripheral vision, we propose a model in terms of the contrast gain of the underlying mechanisms.
periphery, first order, second order, internal equivalent noise, contrast gain control
1-12
Hess, Robert F.
e68cedd8-a5a6-4ece-aade-c017b1fb1d21
Baker, Daniel H.
92545fbf-bb42-4155-a530-91b917648047
May, Keith A.
284351d6-e200-4c96-a239-9e117806c82d
Wang, Jian
010afd88-adf6-442d-8329-64912c031eed
28 January 2008
Hess, Robert F.
e68cedd8-a5a6-4ece-aade-c017b1fb1d21
Baker, Daniel H.
92545fbf-bb42-4155-a530-91b917648047
May, Keith A.
284351d6-e200-4c96-a239-9e117806c82d
Wang, Jian
010afd88-adf6-442d-8329-64912c031eed
Hess, Robert F., Baker, Daniel H., May, Keith A. and Wang, Jian
(2008)
On the decline of 1st and 2nd order sensitivity with eccentricity.
Journal of Vision, 8 (1, article 19), .
(doi:10.1167/8.1.19).
Abstract
We studied the relationship between the decline in sensitivity that occurs with eccentricity for stimuli of different spatial scale defined by either luminance (LM) or contrast (CM) modulation. We show that the detectability of CM stimuli declines with eccentricity in a spatial frequency-dependent manner, and that the rate of sensitivity decline for CM stimuli is roughly that expected from their 1st order carriers, except, possibly, at finer scales. Using an equivalent noise paradigm, we investigated the possible reasons for why the foveal sensitivity for detecting LM and CM stimuli differs as well as the reason why the detectability of 1st order stimuli declines with eccentricity. We show the former can be modeled by an increase in internal noise whereas the latter involves both an increase in internal noise and a loss of efficiency. To encompass both the threshold and suprathreshold transfer properties of peripheral vision, we propose a model in terms of the contrast gain of the underlying mechanisms.
Text
Hess-2008-jov-8-1-19.pdf
- Accepted Manuscript
More information
Submitted date: 23 May 2007
Published date: 28 January 2008
Keywords:
periphery, first order, second order, internal equivalent noise, contrast gain control
Identifiers
Local EPrints ID: 50126
URI: http://eprints.soton.ac.uk/id/eprint/50126
ISSN: 1534-7362
PURE UUID: 7f4d9cb3-5e9a-4f25-a344-d2ca0652c0bb
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Date deposited: 29 Jan 2008
Last modified: 15 Mar 2024 10:03
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Contributors
Author:
Robert F. Hess
Author:
Daniel H. Baker
Author:
Keith A. May
Author:
Jian Wang
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