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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

Chapter:
(p.243) 17 Decreased Arousal as a Result of Sleep Deprivation
Source:
Integrated Models of Cognitive Systems
Author(s):

Glenn Gunzelmann

Kevin A. Gluck

Scott Price

Hans P. A. Van Dongen

David F. Dinges

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780195189193.003.0017

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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