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Integrated Models of Cognitive Systems$
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Wayne D. Gray

Print publication date: 2007

Print ISBN-13: 9780195189193

Published to Oxford Scholarship Online: March 2012

DOI: 10.1093/acprof:oso/9780195189193.001.0001

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Decreased Arousal as a Result of Sleep Deprivation

Decreased Arousal as a Result of Sleep Deprivation

The Unraveling of Cognitive Control

(p.243) 17 Decreased Arousal as a Result of Sleep Deprivation
Integrated Models of Cognitive Systems

Glenn Gunzelmann

Kevin A. Gluck

Scott Price

Hans P. A. Van Dongen

David F. Dinges

Oxford University Press

This chapter discusses recent efforts at developing mechanisms for capturing the effects of fatigue on human performance. It describes a computational cognitive model, developed in ACT-R (adaptive control of thought-rational), that performs a sustained attentional task called the psychomotor vigilance task. It uses neurobehavioral evidence from research on sleep deprivation, in addition to previous research from within the ACT-R community, to select and to evaluate a mechanism for producing fatigue effects in the model. Fatigue is represented by decrementing a parameter associated with arousal in ACT-R, while also reducing a threshold value in the architecture to capture attempts at compensating for the negative effects of decreased arousal. These parameters are associated with the production utility computation in ACT-R, which controls the selection/execution cycle to determine which production (if any) to execute on each cognitive cycle. In ACT-R, this mechanism is linked to the basal ganglia and the thalamus. In turn, portions of the thalamus show heightened activation in attentional tasks under conditions of sleep deprivation.

Keywords:   adaptive control of thought-rational, fatigue, human performance, cognitive model, attentional tasks, psychomotor vigilance task, sleep deprivation, arousal, basal ganglia, thalamus

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