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Journal of Experimental Biology, Vol 203, Issue 3 559-565, Copyright © 2000 by Company of Biologists

JOURNAL ARTICLES

Role of prey-capture experience in the development of the escape response in the squid Loligo opalescens: a physiological correlate in an identified neuron

T Preuss and WF Gilly
Hopkins Marine Station of Stanford University, Department of Biological Sciences, Pacific Grove, CA 93950, USA. tpreuss@aecom.yu. edu

Although extensively used for biophysical studies, the squid giant axon system remains largely unexplored in regard to in vivo function and modulation in any biologically relevant context. Here we show that successful establishment of the recruitment pattern for the giant axon in the escape response elicited by a brief electrical stimulus depends on prey-capture experience early in life. Juvenile squid fed only slow-moving, easy-to-capture prey items (Artemia salina) develop deficits in coordinating activity in the giant axon system with that of a parallel set of non-giant motor axons during escape responses. These deficits are absent in cohorts fed fast-moving, challenging prey items (copepods). These results suggest that the acquisition of inhibitory control over the giant axon system is experience-dependent and that both prey-capture and escape behavior depend on this control.
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