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Absence of binocular summation, eye dominance, and learning effects in color discrimination

Published online by Cambridge University Press:  06 September 2006

MARCELO FERNANDES COSTA ,
DORA FIX VENTURA ,
FELIPE PERAZZOLO ,
MARCIO MURAKOSHI  and
LUIZ CARLOS DE LIMA SILVEIRA
MARCELO FERNANDES COSTA
Affiliation:
Dep. Psicologia Experimental, Instituto de Psicologia, Universidade de São Paulo, São Paulo, Brasil Núcleo de Neurociências e Comportamento, Universidade de São Paulo, São Paulo, Brasil
DORA FIX VENTURA
Affiliation:
Dep. Psicologia Experimental, Instituto de Psicologia, Universidade de São Paulo, São Paulo, Brasil Núcleo de Neurociências e Comportamento, Universidade de São Paulo, São Paulo, Brasil
FELIPE PERAZZOLO
Affiliation:
Dep. Psicologia Experimental, Instituto de Psicologia, Universidade de São Paulo, São Paulo, Brasil Núcleo de Neurociências e Comportamento, Universidade de São Paulo, São Paulo, Brasil
MARCIO MURAKOSHI
Affiliation:
Dep. Psicologia Experimental, Instituto de Psicologia, Universidade de São Paulo, São Paulo, Brasil Núcleo de Neurociências e Comportamento, Universidade de São Paulo, São Paulo, Brasil
LUIZ CARLOS DE LIMA SILVEIRA
Affiliation:
Dep. Fisiologia Universidade Federal do Pará, Belém, Brasil Núcleo de Medicina Tropical, Universidade Federal do Pará, Belém, Brasil.
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Abstract

We evaluated binocular summation, eye dominance, and learning in the Trivector and Ellipses procedures of the Cambridge Colour Test (CCT). Subjects (n = 36, 18–30 years old) were recruited among students and staff from the University of São Paulo. Inclusion criteria were absence of ophthalmological complaints and best-corrected Snellen VA 20/20 or better. The subjects were tested in three randomly selected eye conditions: binocular, monocular dominant eye, and nondominant eye. Results obtained in the binocular and monocular conditions did not differ statistically for thresholds measured along the protan, deutan, and tritan confusion axes (ANOVA, P > 0.05). No statistical difference was detected among discrimination ellipses obtained in binocular or monocular conditions (ANOVA, P > 0.05), suggesting absence of binocular summation or of an effect of eye dominance. Possible effects of learning were examined by comparing successive thresholds obtained in the three testing conditions. There was no evidence of improvement as a function of testing order (ANCOVA, P > 0.05). We conclude that CCT thresholds are not affected by binocularity, eye dominance, or learning. Our results differ from those found by Verriest et al. (1982) using the Farnsworth-Munsell 100 Hue test and Hovis et al. (2004) using the Farnsworth-Munsell panel D-15 test.

Keywords

Binocular summationEye dominanceChromatic discriminationColor visionPsychophysical detection threshold
Type
CHROMATIC CODING
Information
Visual Neuroscience , Volume 23 , Issue 3-4 , May 2006 , pp. 461 - 469
Copyright
© 2006 Cambridge University Press

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