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Title: Capacity Demands of Word Production
Author: Elizabeth, Cook
ISNI:       0000 0001 3444 1785
Awarding Body: University of Birmingham
Current Institution: University of Birmingham
Date of Award: 2007
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In the speech production literatUre, it is often assumed that only conceptualisation and selfmonitoring, but not lexical retrieval require cognitive capacity (e.g., Levelt, 1989, Speaking). However, using a dual-task paradigm (picture-word interference task and a tone discrimination task) Ferreira and Pashler (2002, JEP:LMC) showed that lexical selection but not phonological encoding required capacity. This thesis reports a series of related experiments. The time required for lexical selection and phonological encoding was varied by combining the pictures with semantically or phonologically related or unrelated distractors. The distractors were words or pictures, and they were clearly visible or masked. The results did not support Ferreira and Pashler's conclusion that lexical selection and phonological encoding differed in capacity demands, but instead suggested that either both of these processes require capacity or that they are both equally automatic. In addition, they confirmed that self-monitoring requires capacity. Finally, they demonstrated that the relatedness between a target word and a distractor can have opposing effects on phonological encoding and self-monitoring, and, in a dual task paradigm, on the latencies to perform a primary and secondary task. This complicates the interpretation of the results of dual-task studies, which is an important conclusion for methodological reasons.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available