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Journal of Experimental Biology 129,25-40 (1987)
Published by Company of Biologists 1987

Effects of Wing Campaniform Sensilla Lesions on Stridulation in Crickets

KARL-HEINZ SCHÄFFNER 1 and UWE T. KOCHf 2

1 Max-Planck-Institut für Verhaltensphysiologie, Abteilung Huber, D-8131 Seewiesen, Federal Republic of Germany; Abteilung Vergleichende Neurobiologie, Universität Ulm, Postfach 4066, D-7900 Ulm, FRG.
2 Max-Planck-Institut für Verhaltensphysiologie, Abteilung Huber, D-8131 Seewiesen, Federal Republic of Germany; Fachbereich Biologie, Universität Kaiserslautern, D-6750 Kaiserslautern, FRG

The degradations in the cricket's calling song after lesions of the cubital campaniform sensilla (CCS) are investigated using extracellular recording and angular movement recording techniques. In the intact male, nerve potentials from the CCS during the closing stroke are demonstrated. In the lesioned male, syllable shortenings and missing syllables can be traced to abnormalities in the wing motion: irregular stops (‘sticking’), anomalously high closing speeds with sound emission (‘overspeed’), or high closing speeds without sound emission (‘slipping’) are observed. Despite these defects, the activation pattern of the main opener and closer muscles remains completely unaffected. The defects are interpreted as disturbance of a regulatory system normally maintaining proper engaging forces of the wings.

Key words: motion defects, movement control, sensory feedback, extracellular recording

Accepted on December 12, 1986






© The Company of Biologists Ltd 1987