Identification of stimuli and input pathways mediating food-attraction conditioning in the snail, Helix |
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Authors: | A Friedrich T Teyke |
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Institution: | Institut für Zoologie (III) Biophysik, Johannes Gutenberg-Universit?t, D-55099, Mainz, Germany Tel.: +49-6131 39-4483; Fax: +49-6131 39-5443 e-mail: Teyke@mzdmza.zdv.uni-mainz.de, DE
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Abstract: | Snails become conditioned by a single feeding episode to locate foods which they were unable to locate prior to feeding. To
identify which of the different stimulus parameters of the food mediate learning, snails were presented with isolated stimulus
components during feeding and re-tested the next day for their ability to locate the food. None of the individual components
was sufficient to promote conditioning. Odor combined with a bulk stimulus conditioned the animals, as indicated by their
subsequently locating the food. Elimination of the olfactory sensory inputs from the anterior and/or posterior tentacles prior
to conditioning revealed that the acquisition of the olfactory memory requires olfactory stimulation of the sensory epithelia
on the anterior tentacles. Recall of memory during olfactory orientation requires functional epithelia on the posterior tentacles,
which suggests that the same odor is processed by different input pathways under different situations. Animals with the olfactory
epithelia functional on the same side during conditioning and food searching were able to locate the conditioned food. Animals
with different epithelia functional during conditioning and food searching failed, which suggests that olfactory memory is
stored within one side of the nervous system and cannot be accessed from the contralateral side.
Accepted: 28 November 1997 |
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Keywords: | Olfactory learning Olfactory orientation Memory transfer Sensory input Mollusc |
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