Coordinated Action in 3-D Space II.
Final rept. 1 Jun 94-31 May 97,
MARYLAND UNIV COLLEGE PARK OFFICE OF RESEARCH ADMINISTRATION AND ADVANCEMENT
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Accurate measurements of coordinated human headeyehand actions Were made as subjects manipulated or fixated objects within arms reach. Both tasks were performed under natural conditions in that 1 binocular gaze was recorded with the upper body free from restraints, and 2 the objects serving as stimuli for the visually-guided motor responses were near the subjects head 1 m. Accurate gaze under these conditions required that even the smallest movements of the head were compensated by carefully coordinated conjunctivedisjunctive versionvergence eye movements. Conditions like these are particularly important for human beings, whose ability to design, fabricate and use tools have given them unmatched mastery of their environment Making accurate measurements under these conditions was novel. It required unique instrumentation developed and only available at the University of Maryland, College Park. Research completed on this grant showed that the large literature on human oculomotor performance, based mainly on recordings made under unnatural conditions monocular input, a restrained head and targets beyond arms reach, tends 1 to underestimate both the flexibility and capacity of the oculomotor system, and 2 to obscure its preferred mode of operation under the conditions that made it possible for humans to evolve their exceptional manipulative skills.
- Anatomy and Physiology
- Human Factors Engineering and Man Machine Systems