J. Moll. Stud. (1996), 62, 483-494
© The Malacological Society of London 1996
research-article |
FOOD-RELATED CONDITIONING AND NEURONAL CORRELATES IN THE FRESHWATER SNAIL LYMNAEA STAGNALIS
School of Biological Sciences, University of Manchester Manchester M13 9PT, U K
*Address for correspondence: Dr CR. McCrohan, School of Biological Sciences, University of Manchester, I 124 Stopford Building. Oxford Road. Manchester M13 9PT. U K. email: Cathy_McCrohan{at}man.ac.uk
The feeding response of Lymnaea stagnalis shows robust appetitive conditioning to a novel chemostim-ulus (amyl acetate), which is retained for more than 4 days. In scrru-isolated central nervous system (CNS)-hp preparations taken from conditioned snails, application of amyl acetate to lip tissue led to the onset of fictive feeding in 5/17 individuals, and excitation of an identified cerebral-buccal feeding intemeuron, CV1a. in a further 8. Control group snails showed no response to amyl acetate.
Attempts were made to aversively condition L. stagnalis using a food stimulus (sucrose) as the conditioned stimulus and either an electric shock or mechanical stimulus as the unconditioned stimulus. No conditioned response to sucrose (i.e. withdrawal) was seen following training. However, trained snails exhibited a reduction in responsiveness which was manifest as inhibition of the feeding response to sucrose and an increase in the time taken to emerge from the shell following handling. This reduced responsiveness was seen at 1 hr but was lost by 24 hr after training, and was not observed in control group snails. Semi-isolated CNS-hp preparations from experimental snails recorded 1-3 hr after training exhibited either inhibition of fictive feeding or no response following application of sucrose. Control group snails showed the normal excitatory response to sucrose including induction of feeding motor output
Differences in food-related learning between Lymnaea and other gastropod species are discussed in relation to lifestyle and feeding strategies
(Received 14 January 1996; accepted 3 May 1996)
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