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  • 1
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    Frequency and velocity of rotational head perturbations during locomotion (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The magnetic searth coil technique was used to record horizontal (yaw) and vertical (pitch) head rotations of 20 normal subjects during walking in place, running in place, vigorous voluntary horizontal head rotation, and vigorous voluntary vertical head rotation. Data are presented to show that (1) during locomotion, the head is stabilized in space incompletely but adequately so that the vestibuloocular reflex (VOR) is not saturated; (2) durign vigorous, voluntary head rotations, the maximum head velocity exceeds the range where the VOR can stabilize gaze; and (3) the frequencies of head rotations that occur during locomotion greatly exceed frequencies conventionally used in the laboratory for testing the VOR.
    Keywords: AEROSPACE MEDICINE
    Type: Experimental Brain Research (ISSN 0014-4819); 70; 470-476
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Comparison of smooth pursuit and combined eye-head tracking in human subjects with deficient labyrinthine function (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The effects of deficient labyrinthine function on smooth visual tracking with the eyes and head were investigated, using ten patients with bilateral peripheral vestibular disease and ten normal controls. Active, combined eye-head tracking (EHT) was significantly better in patients than smooth pursuit with the eyes alone, whereas normal subjects pursued equally well in both cases. Compensatory eye movements during active head rotation in darkness were always less in patients than in normal subjects. These data were used to examine current hypotheses that postulate central cancellation of the vestibulo-ocular reflex (VOR) during EHT. A model that proposes summation of an integral smooth pursuit command and VOR/compensatory eye movements is consistent with the findings. Observation of passive EHT (visual fixation of a head-fixed target during en bloc rotation) appears to indicate that in this mode parametric gain changes contribute to modulation of the VOR.
    Keywords: AEROSPACE MEDICINE
    Type: Experimental Brain Research (ISSN 0014-4819); 66; 458-464
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
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