Colour vision of domestic chicks

The colour vision of domestic chicks (Gallus gallus) was investigated by training them to small food containers decorated with tilings of grey and coloured rectangles. Chicks learn to recognise the colour quickly and accurately. Chicks have four types of single-cone photoreceptor sensitive to ultrav...

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Veröffentlicht in:Journal of experimental biology Jg. 202; H. Pt 21; S. 2951
Hauptverfasser: Osorio, D, Vorobyev, M, Jones, C D
Format: Journal Article
Sprache:Englisch
Veröffentlicht: England 01.11.1999
Schlagworte:
Animals
Chickens - physiology
Color Perception - physiology
Humans
Photoreceptor Cells - physiology
Retinal Cone Photoreceptor Cells - physiology
Ultraviolet Rays
ISSN:0022-0949
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Zusammenfassung:The colour vision of domestic chicks (Gallus gallus) was investigated by training them to small food containers decorated with tilings of grey and coloured rectangles. Chicks learn to recognise the colour quickly and accurately. Chicks have four types of single-cone photoreceptor sensitive to ultraviolet, short-, medium- or long-wavelength light. To establish how these receptors are used for colour vision, stimuli were designed to be distinguished only by specific combinations of receptors. We infer (1) that all four single cones are used, and (2) that their outputs are encoded by at least three opponency mechanisms: one comparing the outputs of ultraviolet- and short-wavelength-sensitive receptors, one comparing the outputs of medium- and long-wavelength receptors and a third comparing of the outputs of short- and long- and/or medium-wavelength receptors. Thus, the chicks have tetrachromatic colour vision. These experiments do not exclude a role for the fifth cone type, double cones, but other evidence suggests that these cones serve luminance-based tasks, such as motion detection, and not colour recognition.
Bibliographie:ObjectType-Article-2
SourceType-Scholarly Journals-1
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ISSN:0022-0949
DOI:10.1242/jeb.202.21.2951