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The detection of real and apparent motion by the crabLeptograpsus variegatus

I. Behaviour

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Summary

Optokinetic eye movements can be evoked in rock crabs either by real or apparent motion of the visual field. For wide-field striped stimuli, the apparent motion stimulus is less effective than the real motion but for narrow field light-spot stimuli, intensity is an important factor: at low light intensities real motion is still a more effective stimulus but at high light intensities the opposite is true. The crab's complex response to apparent motion appears to be dominated by the combination of two central mechanisms, one of which decays exponentially during the Dark period, and one which becomes resensitized, after a short delay, in the dark.

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Author notes

  1. J. Erber

    Present address: Institut für Tierphysiologie, Freie Universität Berlin, Grunewaldstraße 34, D-1000, Berlin 41, Federal Republic of Germany

Authors and Affiliations

  1. Department of Neurobiology, Research School of Biological Sciences, Australian National University, 2601, Canberra City, A.C.T., Australia

    D. C. Sandeman & J. Erber

Authors
  1. D. C. Sandeman
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  2. J. Erber
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Supported by the Deutsche Forschungsgemeinschaft ER 79/1

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Sandeman, D.C., Erber, J. The detection of real and apparent motion by the crabLeptograpsus variegatus . J. Comp. Physiol. 112, 181–188 (1976). https://doi.org/10.1007/BF00606537

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  • DOI: https://doi.org/10.1007/BF00606537

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