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Journal of Experimental Biology 42,307-322 (1965)
Published by Company of Biologists 1965

Escape from Recurring Tactile Stimulation in Branchiomma Vesiculosum

FRANKLIN B. KRASNE ¹

¹ Department of Zoology, University of Cambridge; Department of Psychology, University of California, Los Angeles, U.S.A.

1. Branchiomma's rapid escape from tactile stimuli is mediated by the pair of giant nerve axons which run the length of the body above the ventral nerve cord.

2. The giant neurons are connected by very stable, polarized junctions to giant motor axons.

3. The giant-fibre escape reflex fails if tactile stimuli are repeated; a non-giant system which continues to cause slower escape eventually fails also.

4. Recovery from reflex failure is slow.

5. The failure of the rapid escape reflex occurs prior to the giant fibre. It is not primarily due to sensory ending accommodation. It cannot be caused by direct stimulation of the giant fibres.

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