The simulation of action disorganisation in complex activities of daily livingReport as inadecuate






Author: Richard P. Cooper, M.F. Schwartz, P. Yule and T. Shallice

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Action selection in everyday goal-directed tasks of moderate complexity is known to be subject to breakdown following extensive frontal brain injury. A model of action selection in such tasks is presented and used to explore three hypotheses concerning the origins of action disorganisation: that it is a consequence of reduced top-down excitation within a hierarchical action schema network coupled with increased bottom-up triggering of schemas from environmental sources, that it is a more general disturbance of schema activation modelled by excessive noise in the schema network, and that it results from a general disturbance of the triggering of schemas by object representations. Results suggest that the action disorganisation syndrome is best accounted for by a general disturbance to schema activation, while altering the balance between top-down and bottom-up activation provides an account of a related disorder - utilisation be...


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Birkbeck ePrints: an open access repository of the research output of Birkbeck College http:--eprints.bbk.ac.uk Cooper, R.
P.; Schwartz, M.; Yule, P.
and Shallice, T.
(2005).
The simulation of action disorganisation in complex activities of daily living.
Cognitive Neuropsychology 22 (8) 959-1004. This is an author-produced version of a paper published in Cognitive Neuropsychology (ISSN 0264-3294).
This version has been peer-reviewed but does not include the final publisher proof corrections, published layout or pagination. All articles available through Birkbeck ePrints are protected by intellectual property law, including copyright law.
Any use made of the contents should comply with the relevant law.
Copyright © 2005 Psychology Press, Taylor & Francis.
This is an electronic version of an article published in Cognitive Neuropsychology.
Cognitive Neuropsychology is available online at: http:--www.informaworld.com- The final version of this paper can be viewed online at: http:--www.informaworld.com-openurl?genre=article&issn=02643294&volume=22&issue=8&spage=959 Citation for this version: Cooper, R.
P.; Schwartz, M.; Yule, P.
and Shallice, T.
(2005).
The simulation of action disorganisation in complex activities of daily living. London: Birkbeck ePrints.
Available at: http:--eprints.bbk.ac.uk-archive-00000544 Citation for the publisher’s version: Cooper, R.
P.; Schwartz, M.; Yule, P.
and Shallice, T.
(2005).
The simulation of action disorganisation in complex activities of daily living.
Cognitive Neuropsychology 22 (8) 959-1004. http:--eprints.bbk.ac.uk Contact Birkbeck ePrints at lib-eprints@bbk.ac.uk The Simulation of Action Disorganisation in Complex Activities of Daily Living Richard P.
Cooper, Myrna F.
Schwartz, Peter Yule & Tim Shallice Action selection in everyday goal-directed tasks of moderate complexity is known to be subject to breakdown following extensive frontal brain injury.
A model of action selection in such tasks is presented and used to explore three hypotheses concerning the origins of action disorganisation: that it is a consequence of reduced top-down excitation within a hierarchical action schema network coupled with increased bottom-up triggering of schemas from environmental sources, that it is a more general disturbance of schema activation modelled by excessive noise in the schema network, and that it results from a general disturbance of the triggering of schemas by object representations.
Results suggest that the action ....



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