An investigation of verbal idea generation: The effects of prompts on discourse

Bonnie Lok Yan Law (2011). An investigation of verbal idea generation: The effects of prompts on discourse Honours Thesis, School of Psychology, The University of Queensland.

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Author Bonnie Lok Yan Law
Thesis Title An investigation of verbal idea generation: The effects of prompts on discourse
School, Centre or Institute School of Psychology
Institution The University of Queensland
Publication date 2011-10-12
Thesis type Honours Thesis
Supervisor Dr Gail Robinson
Total pages 57
Language eng
Subjects 1701 Psychology
Abstract/Summary The left inferior frontal gyrus (LIFG) has been identified as important for propositional language generation through its role in selecting one response from amongst competing responses. Subcortical areas have also been implicated in fluent verbal generation, but its role is less clear. To investigate the roles of LIFG and subcortical areas in propositional language in the context of discourse, a topic discussion task was designed. The topic discussion task comprised 7 trials where the number of prompts, word frequency and semantic distance were manipulated to vary the number of competing conceptual propositions and, hence, the selection demands (high or low). The quantity and novelty of the speech generated were measured and analysed. Participants were 10 patients diagnosed with stroke and 12 healthy controls matched on age, education, sex and cognitive baseline measures. Results showed that Stroke patients produced fewer words and novel ideas than controls. Patients with LIFG and subcortical lesions did not demonstrate poorer performance on high competition trials. Only the patients with lesions to the LIFG generated fewer novel ideas than controls. Possible explanations for the findings were discussed. It was suggested that selection may not be centrally important in discourse production, which involves non-language processes also, and that the thalamus may be important in expressing novel ideas via discourse.
Keyword Verbal idea generation
Effects of prompts on discourse

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Created: Wed, 20 Jun 2012, 10:02:21 EST by Mrs Ann Lee on behalf of School of Psychology