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  Visual control of eye-stalk orientation in crabs: vertical optokinetics, visual fixation of the horizon, and eye design

Nalbach, H.-O., Nalbach, G., & Forzin, L. (1989). Visual control of eye-stalk orientation in crabs: vertical optokinetics, visual fixation of the horizon, and eye design. Journal of Comparative Physiology A, 165(5), 577-587. doi:10.1007/BF00610990.

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Nalbach, H-O1, 2, Author              
Nalbach, G1, 2, Author              
Forzin, L, Author
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1Former Department Neurophysiology of Insect Behavior, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497802              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794              

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 Abstract: 1. Pitch and roll eye movements of three species of crabs (Heloecius cordiformis, Mictyris longicarpus, Pachygrapsus marmoratus) were recorded in response to visual stimuli. 2. The ‘flat world’ species (Heloecius, Mictyris) with a zone of high vertical acuity around the equator of the eye (Zeil et al. 1986) turn the eye stalks towards a horizontal contrast line presented close to their specialized zone and pursue it for some degrees when it rotates away (Figs. 5a, b, 6a, b, 8, 10a). We interpret this as fixation of the horizon and discuss its relevance for the proposed mechanisms for ‘vision in a flat world’ (Zeil et al. 1986; Nalbach and Nalbach 1987). 3. Both types of crabs, the ‘flat world’ and the ‘complex world’ species, stabilize their eyes against dynamic perturbations not only via mechanosensory systems (Fig. 7, Nalbach et al. 1989) but also via an optokinetic system (Figs. 1, 2). In roll even nystagmic saccades can be elicited which, however, occur more unreliably and are about four times slower than in yaw. They are missing completely in pitch. 4. Regional distribution of optokinetic sensitivity over the eye in pitch and roll (Figs. 3, 4) is discussed as adaptation to image flow occurring under natural conditions. 5. The results obtained with the rock crab,Pachygrapsus (Fig. 4), suggest that movement detectors looking into opposite directions in the visual field might interact specifically to extract global rotational image flow.

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 Dates: 1989-09
 Publication Status: Published in print
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 Identifiers: DOI: 10.1007/BF00610990
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Title: Journal of Comparative Physiology A
  Other : J. Comp. Physiol. A -Neuroethol. Sens. Neural Behav. Physiol.
Source Genre: Journal
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Publ. Info: Heidelberg : Springer Verlag
Pages: - Volume / Issue: 165 (5) Sequence Number: - Start / End Page: 577 - 587 Identifier: ISSN: 0340-7594
CoNE: https://pure.mpg.de/cone/journals/resource/954925519626