Discrimination and identification of luminance contrast stimuli.

Discrimination and identification of luminance contrast stimuli. Research Abstract Details 

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Discrimination and identification of luminance contrast stimuli. Abstract Text:

The goal of this study was to compare luminance contrast discrimination and polarity identification in the inferred Parvocellular (PC-) and Magnocellular (MC-) pathways. The position identification task tested ability to locate a contrast change within a stimulus. The polarity identification task tested ability to classify the contrast change as either brighter or darker. Three paradigms were employed to find these thresholds for the inferred MC- and PC-pathways: Pulsed-Pedestal, Steady-Pedestal and Pedestal-Delta-Pedestal. Position and polarity identification thresholds were the same for the Pulsed-Pedestal stimuli (inferred PC-pathway). The position identification thresholds were lower than the polarity identification thresholds for Steady-Pedestal stimuli (inferred MC-pathway). The position identification thresholds were lower than the polarity identification thresholds for Pedestal-Delta-Pedestal stimuli when the Delta-Pedestal contrast steps were sub-threshold or close to threshold. When the contrast steps were larger, position identification and polarity identification thresholds were similar for the Pedestal-Delta-Pedestal stimuli. Comparisons were also made between position identification and polarity identification thresholds for a short and a long stimulus presentation. There were no systematic differences dependent on presentation duration.

Discrimination and identification of luminance contrast stimuli. Publishing Authors By Initials

For similar nervous system: neural pathways: afferent pathways: visual pathways research abstracts see: nervous system: neural pathways: afferent pathways: visual pathways research

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Discrimination and identification of luminance contrast stimuli. Journal Published:

PUBLICATION TYPE: Research Support, U.S. Gov't,

Journal: Journal of vision

VOLUME: 3

Page Numbers: 599-609

Journal Abbreviation: J Vis

ISSN: 1534-7362

DAY: 28

MONTH: 10

YEAR: 2003

Discrimination and identification of luminance contrast stimuli. Information

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LANGUAGE: eng

NlmUniqueID: 101147197

Discrimination and identification of luminance contrast stimuli. Keywords Mesh Terms:

KEYWORDS: Visual Pathways

MESH TERMS: physiology

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Grant and Affiliation Information for Discrimination and identification of luminance contrast stimuli.

AFFILIATION: Visual Science Laboratories, University of Chicago, Chicago, IL, USA. estefank@yahoo.com

Country: United States

AGENCY: United States NIMH

GRANT: T32 MH20029

ACRONYM: MH

MEDLINETA: J Vis

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