Small field motion detection in goldfish is red-green color blind and mediated by the M-cone type.

Small field motion detection in goldfish is red-green color blind and mediated by the M-cone type.

MedLine Citation:	PMID: 17822579 Owner: NLM Status: MEDLINE
Abstract/OtherAbstract:	Large field motion detection in goldfish, measured in the optomotor response, is based on the L-cone type, and is therefore color-blind (Schaerer & Neumeyer, 1996). In experiments using a two-choice training procedure, we investigated now whether the same holds for the detection of a small moving object (size: 8 mm diameter; velocity: 7 cm/s). In initial experiments, we found that goldfish did not discriminate between a moving and a stationary stimulus, obviously not taking attention to the cue "moving." Therefore, random dot patterns were used in which the stimulus was visible only when moving. Using black and white random dot patterns with variable contrast between 0.2 and 1, we found that the fish could see motion only with high (0.8) contrast. In the decisive experiment, a red-green random dot pattern was used. By keeping the intensity of the red dots constant and reducing the intensity of the green dots, a narrow intensity range was found in which goldfish could no longer discriminate between the moving random dot stimulus in random dot surround and the stationary random dot pattern. The same was the case when a red moving disk was presented in green surround. This is the evidence that object motion is red-green color blind, i.e., color information cannot be used to detect the moving object. Calculations of the cone excitation values revealed that the M-cone type is decisive, as this cone type (and not the L-cone type) is not modulated by that particular red-green pattern in which the moving stimulus was invisible.

Authors:	Martin Gehres; Christa Neumeyer
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Publication Detail:	Type: Journal Article
Journal Detail:	Title: Visual neuroscience Volume: 24 ISSN: 0952-5238 ISO Abbreviation: Vis. Neurosci. Publication Date: 2007 May-Jun
Date Detail:	Created Date: 2007-09-07 Completed Date: 2007-11-28 Revised Date: 2008-11-21
Medline Journal Info:	Nlm Unique ID: 8809466 Medline TA: Vis Neurosci Country: England
Other Details:	Languages: eng Pagination: 399-407 Citation Subset: IM
Affiliation:	Institut für Zoologie III (Neurobiologie), Johannes Gutenberg-Universität, Mainz, Germany.
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MeSH Terms
Descriptor/Qualifier:	Adaptation, Ocular / physiology Animals Behavior, Animal Choice Behavior / physiology Color Perception / physiology* Goldfish / physiology* Motion Perception / physiology* Photic Stimulation Retinal Cone Photoreceptor Cells / physiology*

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