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Journal of Experimental Biology 102,175-185 (1983)
Published by Company of Biologists 1983

The Control System of the Femur-Tibia Joint in the Standing Leg of a Walking Stick Insect Carausius Morosus

H. CRUSE ¹ and J. SCHMITZ ¹

¹ Fakultät für Biologie, Universität Bielefeld, Postfach 8640, D-4800 Bielefeld, Federal Republic of Germany

The control system of the femur-tibia joint of the stick insect (Carausius tnorosus) shows different properties depending on whether the animal is standing or walking. The properties of the system were examined when the animal was walking on a treadwheel and when the examined leg rested on a platform fixed beside the wheel. The results show that the properties of the system in the standing leg of a walking animal are similar to those of a walking animal rather than those of the standing animal. This indicates that the state of the leg (standing or walking) does not seem to be controlled by the neural subsystem of the leg itself but by a more generalized system, which differs in its properties depending upon whether the whole animal is standing or walking. Furthermore the results show how the behaviour of the system changes for the two alternative states.

Key words: Walking, reflex control, stick insect

Submitted on May 5, 1982
Accepted on July 26, 1982

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