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Color discrimination of small targets.

Highnote, Susan Marie.

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Color discrimination of small targets.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Color discrimination of small targets./
Author:	Highnote, Susan Marie.
Description:	389 p.
Notes:	Source: Dissertation Abstracts International, Volume: 64-05, Section: B, page: 2422.
Contained By:	Dissertation Abstracts International64-05B.
Subject:	Psychology, Experimental. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3089477
ISBN:	9780496372096

Color discrimination of small targets.
Highnote, Susan Marie.

Color discrimination of small targets. - 389 p.

Source: Dissertation Abstracts International, Volume: 64-05, Section: B, page: 2422.

Thesis (Ph.D.)--University of California, San Diego, 2003.

Electronic displays typically are required to present symbols which must be distinguished by shape and color in various ambient and surround illumination conditions. Effective implementation of color coding on CRT displays is presently limited by the inability of the current color difference formulae in predicting distinguishable colors for small symbols. In this dissertation, psychophysical experiments examined the degree to which the ability to discriminate color depends upon field size for targets which are smaller than 2 degrees. In the experiments, the just noticeable difference thresholds for small targets presented on a mid-level white surround were measured. In pilot studies it was found that just noticeable difference thresholds became larger as field size decreased with the most significant deviations occurring along the violet-chartreuse axis. The experiments in this dissertation yield data providing the possible weightings for discrimination thresholds for a color difference metric applicable to field sizes below 2 degrees. The field-size-dependent discrimination thresholds for a large group of observers were measured. The experiments also test the conjecture that colors indiscriminable from a standard color define a "cardinal axis ellipsoid" with scaling factors that are field-size-dependent. The color discriminability of rectangular targets which subtend angles below 2 degrees also were investigated in this study. The experimental results suggest that cortical cells selective for orientation may provide an elongation benefit for the discrimination of achromatic increments and the forced-choice detection of both achromatic increments and decrement targets. An elongation cost was observed for the discrimination of chromatic targets. The effect of surround color and separation on contrast thresholds for small targets also was investigated.

ISBN: 9780496372096Subjects--Topical Terms:

517106
Psychology, Experimental.

Color discrimination of small targets.
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500 $a Source: Dissertation Abstracts International, Volume: 64-05, Section: B, page: 2422.
500 $a Chairs: Donald I. A. MacLeod; Kimberly A. Jameson.
502 $a Thesis (Ph.D.)--University of California, San Diego, 2003.
520 $a Electronic displays typically are required to present symbols which must be distinguished by shape and color in various ambient and surround illumination conditions. Effective implementation of color coding on CRT displays is presently limited by the inability of the current color difference formulae in predicting distinguishable colors for small symbols. In this dissertation, psychophysical experiments examined the degree to which the ability to discriminate color depends upon field size for targets which are smaller than 2 degrees. In the experiments, the just noticeable difference thresholds for small targets presented on a mid-level white surround were measured. In pilot studies it was found that just noticeable difference thresholds became larger as field size decreased with the most significant deviations occurring along the violet-chartreuse axis. The experiments in this dissertation yield data providing the possible weightings for discrimination thresholds for a color difference metric applicable to field sizes below 2 degrees. The field-size-dependent discrimination thresholds for a large group of observers were measured. The experiments also test the conjecture that colors indiscriminable from a standard color define a "cardinal axis ellipsoid" with scaling factors that are field-size-dependent. The color discriminability of rectangular targets which subtend angles below 2 degrees also were investigated in this study. The experimental results suggest that cortical cells selective for orientation may provide an elongation benefit for the discrimination of achromatic increments and the forced-choice detection of both achromatic increments and decrement targets. An elongation cost was observed for the discrimination of chromatic targets. The effect of surround color and separation on contrast thresholds for small targets also was investigated.
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790 1 0 $a Jameson, Kimberly A., $e advisor
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