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Wavelength dependence of visual acuity in goldfish

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Abstract

Visual acuity was measured in a two-choice training experiment with food reward. Four goldfish were trained to select a homogeneously illuminated testfield when a high-contrast grating (transparancy) was shown for comparison at the second testfield. Measurements were performed for white and monochromatic testfield illuminations in the light adapted state. Fourteen wavelengths between 404 nm and 683 nm were tested. For each wavelength (and white light) the testfield intensity was determined for which spatial resolution was highest. Between 446 nm and 683 nm maximal values of 2.0 cycles/deg (corresponding to a visual acuity of 15' of arc) were found. At 404 nm and in the ultraviolet resolution was lower (0.6 and ~0.25–0.35 cycles/deg, respectively). Cone and small ganglion cell densities may equally account for visual acuity. The action spectrum of maximal visual acuity is very similar to the spectral sensitivity function representing recognition of "colour". Measurements under reduced room illumination and after treatment with Ethambutol further indicate that the detection of high contrast gratings is processed by the same "channel" as colour vision. A similar separate and parallel processing of "colour" and "form" on the one hand, and "brightness" and "motion" on the other hand was found in humans.

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Acknowledgements

For technical assistance I would like to thank M. Grosz, J. Altmayer, W. Hoch, H. Huber, and the workshop of the Institute. Mark von Campenhausen improved the setup at a very early stage of the study; Ludmila Belovsky and Carlos Mora-Ferrer performed part of the training experiments. For helpful discussions I am very grateful to Tom Reuter and Christoph von Campenhausen.

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  1. Institut für Zoologie III (Neurobiologie), Johannes Gutenberg-Universität, 55099, Mainz, Germany

    C. Neumeyer

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Neumeyer, C. Wavelength dependence of visual acuity in goldfish. J Comp Physiol A 189, 811–821 (2003). https://doi.org/10.1007/s00359-003-0457-4

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  • DOI: https://doi.org/10.1007/s00359-003-0457-4

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