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Tracking performance under time sharing conditions with a digit processing task: A feedback control theory analysisA one dimensional compensatory tracking task and a digit processing reaction time task were combined in a three phase experiment designed to investigate tracking performance in time sharing. Adaptive techniques, elaborate feedback devices, and on line standardization procedures were used to adjust task difficulty to the ability of each individual subject and manipulate time sharing demands. Feedback control analysis techniques were employed in the description of tracking performance. The experimental results show that when the dynamics of a system are constrained, in such a manner that man machine system stability is no longer a major concern of the operator, he tends to adopt a first order control describing function, even with tracking systems of higher order. Attention diversion to a concurrent task leads to an increase in remnant level, or nonlinear power. This decrease in linearity is reflected both in the output magnitude spectra of the subjects, and in the linear fit of the amplitude ratio functions.
Document ID
Document Type
Conference Paper
Gopher, D.
(Illinois Univ. Urbana, IL, United States)
Wickens, C. D.
(Illinois Univ. Urbana, IL, United States)
Date Acquired
August 8, 2013
Publication Date
May 1, 1975
Publication Information
Publication: NASA. Ames Res. Center 11th Ann. Conf. on Manual Control
Subject Category
Man/System Technology And Life Support
Accession Number
Funding Number(s)
CONTRACT_GRANT: F44620-70-C-0105
Distribution Limits
Work of the US Gov. Public Use Permitted.
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