Document Detail

The onset of response habituation during the growth of the lateral giant neuron of crayfish.
MedLine Citation:
PMID:  7983544     Owner:  NLM     Status:  MEDLINE    
1. The postembryonic development of the crayfish LG tailflip command neuron's response to mechanosensory input was studied with standard electrophysiological techniques in animals between 1 and 12 cm long. 2. LG neurons are present in each abdominal hemisegment where they receive direct and indirect excitatory input from mechanosensory afferents. In both small and large crayfish, electrical stimulation of an abdominal ganglionic nerve containing those afferents evoked a compound excitatory postsynaptic potential (EPSP) with an early, reliable alpha component and a later, depression-prone beta wave. It is known that the alpha and beta components are produced by inputs from primary mechanosensory afferents and interneurons, respectively. 3. In crayfish < 2 cm long, LG was excited by the alpha component. When superthreshold, the alpha component triggered a single spike; additional excitation provided by the later beta wave presumably was preempted by refractoriness following the alpha spike and by recurrent inhibition of LG excited by the spike. LG was excited reliably by the alpha component in response to repeated superthreshold stimulation. 4. In crayfish between 2 and 3 cm, LG was excited more readily by the beta wave than by the alpha component. LG's beta spike response habituated to repeated stimulation at 1 Hz, and the beta EPSP depressed whereas the alpha component was largely unchanged. The appearance of the cellular substrates of habituation correlates with the reported onset of behavioral habituation of the tailflip response. Higher stimulus levels brought the alpha EPSP to threshold. Repetitive stimulation at these levels reliably evoked LG spikes from the alpha EPSP.(ABSTRACT TRUNCATED AT 250 WORDS)
D H Edwards; R A Fricke; L D Barnett; S R Yeh; E M Leise
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of neurophysiology     Volume:  72     ISSN:  0022-3077     ISO Abbreviation:  J. Neurophysiol.     Publication Date:  1994 Aug 
Date Detail:
Created Date:  1994-12-30     Completed Date:  1994-12-30     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0375404     Medline TA:  J Neurophysiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  890-8     Citation Subset:  IM; S    
Department of Biology, Georgia State University, Atlanta 30302-4010.
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MeSH Terms
Afferent Pathways / physiology
Arousal / physiology
Astacoidea / growth & development*
Axons / physiology
Cholinergic Fibers / physiology
Dendrites / physiology
Evoked Potentials / physiology
Ganglia, Invertebrate / physiology
Habituation, Psychophysiologic / physiology*
Interneurons / physiology*
Mechanoreceptors / physiology*
Nerve Net / physiology*
Reaction Time / physiology
Sensory Thresholds / physiology
Synaptic Transmission / physiology*
Tail / innervation
Grant Support

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

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