The neural basis of catalepsy in the stick insect cuniculina impigra
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Abstract
Catalepsy in the femur-tibia joint can be characterized as follows: When the joint is passively bent and then released, the joint first extends rapidly by 10°–30° and then returns to its starting position with extremely low speed.
Catalepsy is a characteristic of the femur-tibia control system. This system is quantitatively described in the open-loop configuration (input: stimulation of the femoral chordotonal organ; output: movement of the tibia). The output shows a predominant dynamic portion which only responds to movement and a weak static portion which responds to position. The dynamic portion can be described by a high-pass and a low-pass filter in series. The time constant of the high-pass filter in series. The time constant of the high-pass filter depends on input slope. The system possesses a large phase reserve and is therefore very stable in the closed loop configuration.
The results confirm the hypothesis that the high gain of the phasmid control system evolved only under a selection pressure towards catalepsy.
Keywords
Control System Time Constant Selection Pressure Closed Loop High GainPreview
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References
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