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 Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by CHAPPLE, W. D. Search for Related Content PubMed Articles by CHAPPLE, W. D.

Journal of Experimental Biology 45,401-410 (1966)
Published by Company of Biologists 1966

Motoneuron Responses to Visual Stimuli in Oncopeltus Fasciatus Dallas

WILLIAM D. CHAPPLE ¹

¹ Control Systems Laboratory, Stanford Research Institute, Menlo Park, California, U.S.A.; Department of Zoology and Entomology, University of Connecticut, Storrs, Connecticut 06268

1. Tonic discharges of homologous units in the left and right metathoracic leg nerves in response to increases and decreases in light intensity were observed.

2. Periodic variations in the frequencies of these units was shown to be related to leg movement and at a frequency appropriate for walking.

3. The intensity and duration of discharge of these units was related to the change in light intensity and the frequency of stimulation.

4. The unit of one side normally fired at a higher frequency than that of the other.

5. This was separate from the asymmetry produced by placing the animal in a rotating drum with a single 55° stripe. In this case, clockwise movement of the stripe produced a higher frequency discharge on the left side, while a counterclockwise movement reversed the frequency ratio.

6. Units in the connectives appeared to trigger this discharge.