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Journal of Experimental Biology 54,497-505 (1971)
Published by Company of Biologists 1971

Factors Regulating the Discharge Frequency in Optomotor Fibres Of Carcinus Maenas

C. A. G. WIERSMA ¹ and L. FIORE ²

¹ Department of Physiology, Medical Faculty, Rotterdam; Division of Biology, California Institute of Technology, Pasadena, California 91109, U.S.A.
² Department of Physiology, Medical Faculty, Rotterdam; Istituto di Biologia Generale, Università di Pisa, Italy

1. The influence of the excited state of the animal on various motor neurone discharges and accompanying muscle action potentials was studied in the eyestalk of the crab, Carcinus maenas.

2. In most cases large increases in firing frequency could be obtained during such states. An exception is the tonic eye-withdrawal system in which an inhibitory effect is caused.

3. A pronounced difference in habituation to constant stimuli between spring and summer was found for the position fibres; in spring it was slow and in summer much quicker.