Document Detail

Behavioral and electromyographic characterization of the local frequency of tacrine-induced tremulous jaw movements.
MedLine Citation:
PMID:  9662079     Owner:  NLM     Status:  MEDLINE    
Rats were implanted with fine-wire electromyograph (EMG) electrodes and were videotaped to identify the local frequency characteristics and muscle activity associated with tacrine-induced tremulous jaw movements. All rats received intraperitoneal injections of 2.5 mg/kg tacrine. The videotape sessions were played back in slow motion (i.e., one-sixth normal speed), and an observer entered each jaw movement into a computer program that recalculated the interresponse time and the local frequency (in hertz) for each movement within a burst. Analyses of the distribution of frequencies showed that the peak frequency of jaw movements was in the 3- to 5-Hz frequency range, with an average frequency of 4.0 Hz. EMG electrodes were implanted into three jaw muscles: temporalis, anterior belly of digastricus, and masseter. Tremulous jaw movements were not accompanied by consistent changes in masseter activity. The anterior belly of digastricus showed bursts of EMG activity during some jaw movements, although the temporal relation between jaw movements and EMG activity was somewhat inconsistent. The muscle that showed activity most closely related to tremulous jaw movements was the temporalis. During bursts of jaw movements, temporalis muscles across several different rats showed bursts of EMG activity. Sections of videotape corresponding to bursts of EMG activity were reanalyzed by freeze-frame examination of the tape; typically, the temporalis showed a burst for each jaw movement, with the burst of activity occurring during the jaw-closing phase and the transition between jaw closing and opening. These results indicate that the local frequency of tremulous jaw movements is within the 3- to 7-Hz frequency that is typically associated with parkinsonian tremor. Moreover, the EMG data suggest that temporalis is a major contributor to the muscle activity that underlies tremulous jaw movements.
M S Cousins; A Atherton; J D Salamone
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Physiology & behavior     Volume:  64     ISSN:  0031-9384     ISO Abbreviation:  Physiol. Behav.     Publication Date:  1998 May 
Date Detail:
Created Date:  1998-09-16     Completed Date:  1998-09-16     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0151504     Medline TA:  Physiol Behav     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  153-8     Citation Subset:  IM    
Department of Psychology, University of Connecticut, Storrs 06269-1020, USA.
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MeSH Terms
Behavior, Animal / drug effects*
Cholinesterase Inhibitors / adverse effects*
Dyskinesia, Drug-Induced / physiopathology*,  psychology*
Electrodes, Implanted
Electromyography / drug effects*
Jaw / physiology*
Rats, Sprague-Dawley
Tacrine / adverse effects*
Videotape Recording
Reg. No./Substance:
0/Cholinesterase Inhibitors; 321-64-2/Tacrine

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

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