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ERIC Number: EJ778701
Record Type: Journal
Publication Date: 2002-May
Pages: 41
Abstractor: Author
Reference Count: 0
ISSN: ISSN-0010-0285
Task Switching: A PDP Model
Gilbert, Sam J.; Shallice, Tim
Cognitive Psychology, v44 n3 p297-337 May 2002
When subjects switch between a pair of stimulus-response tasks, reaction time is slower on trial N if a different task was performed on trial N--1. We present a parallel distributed processing (PDP) model that simulates this effect when subjects switch between word reading and color naming in response to Stroop stimuli. Reaction time on "switch trials" can be slowed by an extended response selection process which results from (a) persisting, inappropriate states of activation and inhibition of task-controlling representations; and (b) associative learning, which allows stimuli to evoke tasks sets with which they have recently been associated (as proposed by Allport & Wylie, 2000). The model provides a good fit to a large body of empirical data, including findings which have been seen as problematic for this explanation of switch costs, and shows similar behavior when the parameters are set to random values, supporting Allport and Wylie's proposal. [This research was supported by the UK Medical Research Council.]
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A