Accession Number : AD0624830

Title :   TIME, UNCERTAINTY, AND INCENTIVE VARIABLES IN COMPOSITE TASK PERFORMANCE.

Descriptive Note : Final rept., 30 Jun 64-30 Sep 65,

Corporate Author : NORTH AMERICAN AVIATION INC COLUMBUS OHIO

Personal Author(s) : Feallock,John B. ; Bahrick,Harry P. ; Ornstein,George N.

Report Date : 30 SEP 1965

Pagination or Media Count : 42

Abstract : Within complex man-machine systems, individual operators are commonly required to perform two or more functions concurrently. This report describes two empirical evaluations of the effects of variables common to complex systems upon the performance of a composite task comprised of two serial tasks. The first study investigated the effects of signal rate, signal duration and signal onset predictability upon performance accuracy and latency. Accuracy scores were reliably decreased by increased signal rate and increased onset predictability, although signal duration produced no reliable differences. Latency scores were insensitive to all three independent variables. In the second study, two variables were evaluated for their effects upon the accuracy of performance on the individual channels. One variable was the redundancy of signals on the second channel; the other was the ratio of incentive pay for the first and second channels. Performance improved reliably with signal redundancy for only the channel whose signal redundancy was increased. Different ratios of incentive pay did not produce reliable differences in performance for either channel, although certain trends were noted. (Author)

Descriptors :   (*MAN MACHINE SYSTEMS, PERFORMANCE(HUMAN)), SIGNALS, PERFORMANCE(HUMAN), MOTIVATION, STIMULATION(PHYSIOLOGY), PERCEPTION(PSYCHOLOGY), MOTOR REACTIONS, STRESS(PSYCHOLOGY), ANALYSIS OF VARIANCE

Subject Categories : Psychology
      Human Factors Engineering & Man Machine System

Distribution Statement : APPROVED FOR PUBLIC RELEASE