Document Detail


Correlates of Habituation of a Polysynaptic Reflex in Crayfish In Vivo and In Vitro.
MedLine Citation:
PMID:  12106338     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Reflex leg levation habituates during repeated electrical stimulation of mechanosensory afferents in the dactyl of the fifth walking leg of the crayfish, Procambarus clarkii. This was investigated in decerebrate crayfish, and reproduced in an isolated thoracic ganglion preparation. In vivo, trains of stimuli delivered every 2.5 s produced a gradual decrease in the amplitude of the mechanical response, and a concomitant decrease in the number of impulses per burst in the levator muscle myogram. Near complete recovery occurred after 10 min rest, and transient dishabituation was observed after electrical stimulation of the telson. Less frequent or stronger stimuli led to less rapid habituation. In vitro, the same parametric characteristics of habituation were observed in the levator nerve responses, while the intrinsic variability of the reflex was reduced. The response decrement was shown to be unrelated to changes in the afferent excitation. Evoked polysynaptic excitatory postsynaptic potentials (EPSPs) in levator motorneurons decreased in parallel with the levator neurogram. This decrease was unrelated to any change in the resting membrane potential of the levator motorneurons. Interneurons with habituating EPSPs, antagonistic depressor motorneurons with habituating inhibitory postsynaptic potentials and non-habituating responses in other motorneuronal groups were also found. These findings point to a central locus of habituation upstream from the motorneurons, and offer prospects for a detailed investigation of the mechanisms of habituation in a polysynaptic system.
Authors:
A. R. Marchand; W. J. P. Barnes
Related Documents :
1552278 - Abdominal postural motor responses initiated by the muscle receptor organ in lobster de...
18428548 - Measurement of startle response, prepulse inhibition, and habituation.
10426528 - Electrically-evoked inhibitory effects of the nucleus submedius on the jaw-opening refl...
4316678 - Excitatory postsynaptic potential and monosynaptic reflex discharge of spinal motoneuro...
7688038 - Cultured hippocampal neurons show responses to bdnf, nt-3, and nt-4, but not ngf.
20861428 - Microstimulation of posterior parietal cortex biases the selection of eye movement goal...
Publication Detail:
Type:  JOURNAL ARTICLE    
Journal Detail:
Title:  The European journal of neuroscience     Volume:  4     ISSN:  1460-9568     ISO Abbreviation:  Eur. J. Neurosci.     Publication Date:  1992  
Date Detail:
Created Date:  2002-Jul-10     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8918110     Medline TA:  Eur J Neurosci     Country:  -    
Other Details:
Languages:  ENG     Pagination:  521-532     Citation Subset:  -    
Affiliation:
CNRS, Laboratoire de Neurobiologie et Mouvements, 31 Chemin J. Aiguier, B.P. 71, 13402 Marseille Cedex 9, France.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Parallel Circuits from Cones to the On-Beta Ganglion Cell.
Next Document:  Memory Formation in Day-old Chicks Requires NMDA but not Non-NMDA Glutamate Receptors.