Linking impulse response functions to reaction time: rod and cone reaction time data and a computational model.

Linking impulse response functions to reaction time: rod and cone reaction time data and a computational model. Research Abstract Details 

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Linking impulse response functions to reaction time: rod and cone reaction time data and a computational model. Abstract Text:

Dingcai Cao,Andrew J Zele,Joel Pokorny,Dingcai Cao,Andrew J Zele,Joel Pokorny,

Reaction times for incremental and decremental stimuli were measured at five suprathreshold contrasts for six retinal illuminance levels where rods alone (0.002-0.2 Trolands), rods and cones (2-20 Trolands) or cones alone (200 Trolands) mediated detection. A 4-primary photostimulator allowed independent control of rod or cone excitations. This is the first report of reaction times to isolated rod or cone stimuli at mesopic light levels under the same adaptation conditions. The main findings are: (1) For rods, responses to decrements were faster than increments, but cone reaction times were closely similar. (2) At light levels where both systems were functional, rod reaction times were approximately 20 ms longer. The data were fitted with a computational model that incorporates rod and cone impulse response functions and a stimulus-dependent neural sensory component that triggers a motor response. Rod and cone impulse response functions were derived from published psychophysical two-pulse threshold data and temporal modulation transfer functions. The model fits were accomplished with a limited number of free parameters: two global parameters to estimate the irreducible minimum reaction time for each receptor type, and one local parameter for each reaction time versus contrast function. This is the first model to provide a neural basis for the variation in reaction time with retinal illuminance, stimulus contrast, stimulus polarity, and receptor class modulated.

Linking impulse response functions to reaction time: rod and cone reaction time data and a computational model. Publishing Authors By Initials

D Cao,AJ Zele,J Pokorny,D Cao,AJ Zele,J Pokorny,

For similar psychological phenomena and processes: mental processes: perception: visual perception research abstracts see: psychological phenomena and processes: mental processes: perception: visual perception research

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Linking impulse response functions to reaction time: rod and cone reaction time data and a computational model. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Vision research

VOLUME: 47

Page Numbers: 1060-74

Journal Abbreviation: Vision Res.

ISSN: 0042-6989

DAY: 7

MONTH: 03

YEAR: 2007

Linking impulse response functions to reaction time: rod and cone reaction time data and a computational model. Information

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LANGUAGE: eng

NlmUniqueID: 417402

Linking impulse response functions to reaction time: rod and cone reaction time data and a computational model. Keywords Mesh Terms:

KEYWORDS: Visual Perception

MESH TERMS: physiology

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Grant and Affiliation Information for Linking impulse response functions to reaction time: rod and cone reaction time data and a computational model.

AFFILIATION: Department of Ophthalmology and Visual Science, The University of Chicago, 940 East 57th Street, Chicago, IL 60637, USA.

Country: England

AGENCY: United States NEI

GRANT: EY00901

ACRONYM: EY

MEDLINETA: Vision Res

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