Document Detail


Head perturbations during walking while viewing a head-fixed target.
MedLine Citation:
PMID:  7487804     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: Inexpensive, head-fixed computer displays are now available that subjects can wear during locomotion.
HYPOTHESIS: Viewing a head-fixed visual display will change the characteristics of rotational head perturbations during natural walking.
METHODS: Using a 3-axis angular rate sensor, we measured head rotations during natural or treadmill walking, in 10 normal subjects and 2 patients with deficient vestibular function, as they attempted to view (A) a stationary target at optical infinity; and (B) a target at a distance of 20 cm rigidly attached to the head.
RESULTS: Normal subjects and patients showed no significant change in the predominant frequency of head rotations in any plane (ranging 0.7-5.7 Hz) during the two different viewing tasks (p > 0.1). Mean peak head velocities (ranging 6-36 degrees.s-1) also showed no difference during the two viewing conditions except in the yaw plane, in which values were greater while viewing the near target (p < 0.005). Predominant frequencies of head rotations were similar in the pitch plane during natural or treadmill walking; however, peak velocities of pitch head rotations were substantially greater during natural walking (p < 0.05). One vestibular patient showed modest increases of head velocity during natural walking compared with normal subjects.
CONCLUSIONS: Rotational head perturbations that occur during natural walking are largely unaffected when subjects view a head-fixed target. There is need to study how such perturbations, which induce vestibular eye movements, affect vision of head-fixed displays.
Authors:
V E Das; A Z Zivotofsky; A O DiScenna; R J Leigh
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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:  Aviation, space, and environmental medicine     Volume:  66     ISSN:  0095-6562     ISO Abbreviation:  Aviat Space Environ Med     Publication Date:  1995 Aug 
Date Detail:
Created Date:  1995-12-04     Completed Date:  1995-12-04     Revised Date:  2014-07-29    
Medline Journal Info:
Nlm Unique ID:  7501714     Medline TA:  Aviat Space Environ Med     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  728-32     Citation Subset:  IM; S    
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MeSH Terms
Descriptor/Qualifier:
Adult
Aged
Female
Fixation, Ocular*
Head / physiology*
Humans
Locomotion*
Male
Middle Aged
Movement / physiology*
Vision Disorders / physiopathology
Grant Support
ID/Acronym/Agency:
EYO6717/EY/NEI NIH HHS
Investigator
Investigator/Affiliation:
R J Leigh / Case Western Reserve U, Cleveland, OH

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


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