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Title:Is comprehension necessary for error detection? A conflict-based account of monitoring in speech production
Author(s):Nozari, Nazbanou
Director of Research:Dell, Gary S.
Doctoral Committee Chair(s):Dell, Gary S.
Doctoral Committee Member(s):Garnsey, Susan M.; Simons, Daniel J.; Coles, Michael G.H.; Bock, J. Kathryn
Department / Program:Psychology
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Speech errors
Speech monitoring
Domain-general mechanisms
Error detection
Abstract:Although speech is error-prone, verbal communication is successful because speakers can detect (and correct) their errors. The standard theory of speech-error detection, the perceptual-loop account, posits that the comprehension system monitors production output for errors. Such a comprehension-based monitor, however, cannot explain the double dissociation between comprehension and error-detection ability observed in the aphasic patients. We propose a new theory of speech-error detection which is, instead, based on the production process itself. The theory borrows from studies of forced-choiceresponse tasks the notion that error detection is accomplished by monitoring response conflict via a frontal brain structure, such as the anterior cingulate cortex. We implement this idea in the two-step model of word production, and test the model-derived predictions on a sample of aphasic patients. Our results show a strong correlation between patients’ error detection ability and the model’s characterization of their production skills, and no significant correlation between error detection and comprehension measures, thus supporting a production-based monitor, generally, and the implemented conflict-based monitor in particular. The successful application of the conflict-based theory to error detection in linguistic, as well as non-linguistic domains points to a domain-general monitoring system.
Issue Date:2011-05-25
Rights Information:Copyright 2011 Nazbanou Nozari
Date Available in IDEALS:2011-05-25
Date Deposited:2011-05

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