Lateralized memory storage and crossed inhibition during odor processing by Limax |
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Authors: | T Teyke J W Wang A Gelperin |
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Institution: | Institut für Zoologie (III) Biophysik, Johannes Gutenberg-Universit?t, D-55099 Mainz, Germany, DE Biological Computation Research Department, Bell Laboratories, Lucent Technologies, Murray Hill, NJ 07974, USA e-mail: CNSAG@Bell-Labs.com Fax: +1-908-582-4702, US
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Abstract: | After odor conditioning intact Limax maximus and injecting LY into their haemocoel, labeled groups of neurons are found in either the right or left procerebral lobe but
never in both procerebral lobes. This suggests that a competitive interaction occurs between right and left odor processing
pathways of which the procerebral lobe is a part. We use the nerve discharge in the external peritentacular nerve evoked by
applying a puff of conditioned odor to the nose to document crossed inhibition between left and right odor processing pathways.
Responses in the external peritentacular nerve evoked by stimulating one superior nose with a conditioned odor are strongly
lateralized as responses occur only on the stimulated side. Stimulating both superior noses simultaneously with the same conditioned
odor yields responses in both external peritentacular nerves that resemble the sum of responses to unilateral stimulation.
Simultaneously stimulating both superior noses, each with a different conditioned odor, leads to strong inhibition of both
external peritentacular nerve responses. The crossed inhibition is also evident if both superior and inferior noses on the
same side are stimulated simultaneously. A lateral inhibitory mechanism, situated postsynaptic to odor recognition, appears
to inhibit external peritentacular nerve responses if the two noses receive conflicting sensory inputs.
Accepted: 14 December 1999 |
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Keywords: | Learning Procerebrum Oscillations Nitric oxide Inhibition |
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