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Time Estimation as A Secondary Task to Measure WorkloadVariation in the length of time productions and verbal estimates of duration was investigated to determine the influence of concurrent activity on operator time perception. The length of 10-, 20-, and 30-sec intervals produced while performing six different compensatory tracking tasks was significantly longer, 23% on the average, than those produced while performing no other task. Verbal estimates of session duration, taken at the end of each of 27 experimental sessions, reflected a parallel increase in subjective underestimation of the passage of time as the difficulty of the task performed increased. These data suggest that estimates of duration made while performing a manual control task provide stable and sensitive measures of the workload imposed by the primary task, with minimal interference.
Document ID
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Sandra G. Hart
(University of California, Berkeley Berkeley, 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
Meeting Information
Meeting: Eleventh Annual Conference on Manual Control
Location: Moffett Field, CA
Country: US
Start Date: May 21, 1975
End Date: May 23, 1975
Sponsors: National Aeronautics and Space Administration
Accession Number
Funding Number(s)
Distribution Limits
Work of the US Gov. Public Use Permitted.
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