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Classical Conditioning of Feeding in Aplysia: II. Neurophysiological Correlates
- Publication Year :
- 2000
- Publisher :
- Society for Neuroscience, 2000.
-
Abstract
- Feeding behavior inAplysia californicacan be classically conditioned using tactile stimulation of the lips as conditional stimulus (CS) and food as unconditional stimulus (US) [Lechner et al., 2000 (companion paper)]. Conditioning resulted in an increase in the number of CS-evoked bites that persisted for at least 24 hr after training. In this study, neurophysiological correlates of classical conditioning training were identified and characterized in anin vitropreparation of the cerebral and buccal ganglia. Stimulation of a lip nerve (AT4), which mediates mechanosensory information, resulted in a greater number of buccal motor patterns (BMPs) in ganglia isolated from animals that had received paired training than in ganglia from control animals. The majority of the evoked BMPs were classified as ingestion-like patterns. Intracellular recordings from pattern-initiating neuron B31/32 revealed that stimulation of AT4evoked greater excitatory input in B31/32 in preparations from animals that had received paired training than from control animals. In contrast, excitatory input to buccal neuron B4/5 in response to stimulation of AT4was not significantly increased by paired training. Moreover, correlates of classical conditioning were specific to stimulation of AT4. The number of spontaneously occurring BMPs and the intrinsic properties of two buccal neurons (B4/5 and B31/32) did not differ between groups. These results suggest that appetitive classical conditioning of feeding resulted in the pairing-specific strengthening of the polysynaptic pathway between afferent fibers and pattern-initiating neurons of the buccal central pattern generator.
- Subjects :
- Conditioning, Classical
Models, Neurological
Action Potentials
Stimulation
Stimulus (physiology)
Ganglia, Sensory
Memory
Aplysia
medicine
Animals
ARTICLE
Sensory stimulation therapy
biology
General Neuroscience
Mouth Mucosa
Central pattern generator
Classical conditioning
Feeding Behavior
biology.organism_classification
Lip
medicine.anatomical_structure
Excitatory postsynaptic potential
Neuron
Nerve Net
Psychology
Neuroscience
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....3b79dac3afbbcddbc665b5c7dfff2e8c