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Vertical disparity and binocular vision in the praying mantis

Published online by Cambridge University Press:  02 June 2009

Samuel Rossel ,
Ute Mathis  and
Thomas Collett
Samuel Rossel
Affiliation:
Institut für Biologie I, Albert-Ludwigs-Universität, Albertstrasse 21a, 7800-Freiburg, Germany
Ute Mathis
Affiliation:
Institut für Biologie I, Albert-Ludwigs-Universität, Albertstrasse 21a, 7800-Freiburg, Germany
Thomas Collett
Affiliation:
School of Biological Sciences, University of Sussex, Falmer, Brighton, Sussex BN19QG, UK
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Abstract

We have investigated how the binocular control of prey capture in the praying mantis is affected by abnormally large vertical disparities, which were introduced by prisms placed in front of the eyes. The position of a target on the two retinae determines both the magnitude of head saccades made to fixate a target and its perceived distance. Over the wholerange of vertical disparities tested (up to at least 30 deg), the frequency of fixating saccades is normal while the amplitude of their vertical component is a compromise between the saccades specified by each eye individually. Distance measurements are not affected by imposed vertical disparities. But the larger the vertical disparity, the more reluctant the mantid is to strike at the target until disparities exceed 15 deg when no strikes are elicited at all.

Keywords

Binocular visionPraying mantisVertical disparitySpatial localization
Type
Research Articles
Information
Visual Neuroscience , Volume 8 , Issue 2 , February 1992 , pp. 165 - 170
Copyright
Copyright © Cambridge University Press 1992

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