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Publication AbstractsOcular Fixation During Eye and Head Tracking With and Without a Visual Cue to Head PositionNick Fogt and Nicholas LuthmanAviat Space Environ Med 2002; 73:1031-7 AbstractPurpose: This experiment had two purposes. The first purpose was to compare ocular fixation during eye tracking, head tracking, and head tracking with a visual cue to head position. The second purpose was to compare head tracking with and without a visual cue to head position. Methods: Eleven subjects tracked a pseudo-random laser target in three conditions. In one condition (Condition 1), subjects tracked the target primarily with the eyes. In a second condition (Condition HT), subjects tracked the target with the head but no visual cue to head position was provided. In the final condition, subjects tracked the target with the head and were given a visual cue to head position (Condition HR). Results: On average, ocular fixation was worst in Condition HR and similar in Condition 1 and Condition HT. Mismatches in target and head velocity greater than 60° · sec-1 occurred more frequently in Condition HR than in Condition HT. Conclusions: Ocular tracking of a pseudo-random target is adversely affected in a minor way by head movement, but tracking declines significantly when head tracking is performed with a visual cue to head position. In terms of velocity matching, head tracking is also adversely affected by a head position cue.Keywords: eye movements, vestibulo-ocular reflex, pursuit eye movements, saccades, head tracking, head-aiming cue. Information on subscribing, and on obtaining copies of an article or of an entire issue. Table of Contents for Volume 73, Number 10 of the ASME journal.
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