Document Detail


Variability in velocity profiles during free-air whisking behavior of unrestrained rats.
MedLine Citation:
PMID:  18436634     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
During exploratory behaviors, the velocity of an organism's sensory surfaces can have a pronounced effect on the incoming flow of sensory information. In this study, we quantified variability in the velocity profiles of rat whisking during natural exploratory behavior that included head rotations. A wide continuum of profiles was observed, including monotonic, delayed, and reversing velocities during protractions and retractions. Three alternative hypotheses for the function of the variable velocity profiles were tested: 1) that they produce bilateral asymmetry specifically correlated with rotational head velocity, 2) that they serve to generate bilaterally asymmetric and/or asynchronous whisker movements independent of head velocity, and 3) that the different profiles--despite increasing variability in instantaneous velocity--reduce variability in the average whisking velocity. Our results favor the third hypothesis and do not support the first two. Specifically, the velocity variability within a whisk can be observed as a shift in the phase of the maximum velocity. We discuss the implications of these results for the control of whisker motion, horizontal object localization, and processing in the thalamus and cortex of the rat vibrissal system.
Authors:
R Blythe Towal; Mitra J Z Hartmann
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2008-04-24
Journal Detail:
Title:  Journal of neurophysiology     Volume:  100     ISSN:  0022-3077     ISO Abbreviation:  J. Neurophysiol.     Publication Date:  2008 Aug 
Date Detail:
Created Date:  2008-08-13     Completed Date:  2008-11-05     Revised Date:  2009-05-15    
Medline Journal Info:
Nlm Unique ID:  0375404     Medline TA:  J Neurophysiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  740-52     Citation Subset:  IM    
Affiliation:
Department of Biomedical Engineering, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208-3107, USA.
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MeSH Terms
Descriptor/Qualifier:
Air*
Animals
Behavior, Animal
Exploratory Behavior / physiology*
Female
Functional Laterality
Head Movements / physiology*
Models, Biological
Physical Stimulation / methods
Probability
Rats
Rats, Long-Evans
Rotation
Time Factors
Vibrissae / innervation*
Videodisc Recording
Wakefulness / physiology*
Grant Support
ID/Acronym/Agency:
F31 NS061488-01A1/NS/NINDS NIH HHS
Comments/Corrections
Comment In:
J Neurophysiol. 2008 Aug;100(2):551-3   [PMID:  18562552 ]

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


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