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The International Journal of Aviation Psychology Volume 10, 2000 - Issue 4
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Original Articles

A Closed-Loop System for Examining Psychophysiological Measures for Adaptive Task Allocation

Lawrence J. Prinzel
,
Frederick G. Freeman
,
Mark W. Scerbo
,
Peter J. Mikulka
&
Alan T. Pope
Pages 393-410 | Published online: 13 Nov 2009
 
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Abstract

A closed-loop system was evaluated for its efficacy in using psychophysiological indexes to moderate workload. Participants were asked to perform either 1 or 3 tasks from the Multiattribute Task Battery and complete the NASA Task Load Index after each trial. An electroencephalogram (EEG) was sampled continuously while they performed the tasks, and an EEG index (beta/alpha plus theta) was derived. The system made allocation decisions as a function of the level of operator engagement based on the value of the EEG index. The results of the study demonstrated that it was possible to moderate an operator's level of engagement through a closed-loop system driven by the operator's own EEG. In addition, the system had a significant impact on behavioral, subjective, and psychophysiological correlates of workload as task load increased. The theoretical and practical implications of these results for adaptive automation are discussed.

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