QUICK SEARCH:   [advanced] Author: Keyword(s):
Home     Help     Feedback     Subscriptions     Archive     Search     Table of Contents

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by HORRIDGE, G. A. Search for Related Content PubMed PubMed Citation Articles by HORRIDGE, G. A.

Journal of Experimental Biology 44,285-295 (1966)
Published by Company of Biologists 1966

Adaptation and other Phenomena in the Optokinetic Response of the Crab, Carcinus

G. A. HORRIDGE ¹

¹ Gatty Marine Laboratory and Department of Natural History, St Andrews

1. Adaptation to oscillatory stimuli is significant in the range 1-10/sec., for angular amplitudes of about 1°. The mechanism for perception of slow components remains unchanged when that to fast components is eliminated by adaptation.

2. Spontaneous leg movements are accompanied by a temporary increase in gain, showing a central control of the gain.

3. All eye movements are in two dimensions and components in the vertical plane appear similar to those in the horizontal plane, except that in the vertical plane the maximum range is over about 5° and there is no fast return phase.

4. The eye position is less stable in the dark. A single small light giving 0.0003 lux is sufficient to remove low-frequency components from the spontaneous eye movements

5. An imposed tremor of amplitude 0.2-2.0° and period 1-10 sec. is sufficient to make stationary stripes, which would otherwise be ineffective, have an inhibitory effect on movements of the other eye.

6. A new form of arthropod eye movement, saccadic flicks, can be a sign of arousal and attention.

7. Optokinetic responses are a consequence of the visual stabilization of the eye.