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1
Semantic activation in Parkinson's disease patients on and off levodopa
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2
Hemispheric contributions to semantic activation: A divided visual field and event-related potential investigation of time-course.
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3
Dopaminergic neuromodulation of semantic processing: A 4-T fMRI study with levodopa
Copland, David A.; McMahon, Katie L.; Silburn, Peter A.. - : Oxford University Press., 2009
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4
Verbal fluency, semantics, context and symptom complexes in schizophrenia
Abstract: Lexical-semantic access and retrieval was examined in 15 adults diagnosed with schizophrenia and matched controls. This study extends the literature through the inclusion of multiple examinations of lexical-semantic production within the same patient group and through correlating performance on these tasks with various positive and negative clinical symptoms. On tasks of verbal fluency, meaning generation, sentence production using contextual information and confrontation naming, participants with schizophrenia made significantly more semantic errors on naming tasks; produced fewer meanings for homophones; produced fewer items on semantic, phonological, cued and switching fluency tasks; and produced more errors on sentence production tasks when compared to healthy controls. Significant correlations were also observed between ratings of psychomotor poverty and measures of semantic production and mental inflexibility. This study has provided additional evidence for deficits in lexical-semantic retrieval which are not due to underlying semantic store degradation, do not involve phonological based retrieval, and at the level of sentence generation appear to vary as a function of the contextual constraints provided.
Keyword: 170101 Biological Psychology (Neuropsychology; 170204 Linguistic Processes (incl. Speech Production and Comprehension); C1; Language; Lexical-semantic; Physiological Psychology); Psychomotor poverty; Psychopharmacology; schizophrenia; Thought disorder
URL: https://espace.library.uq.edu.au/view/UQ:185849
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5
Impaired semantic inhibition during lexical ambiguity repetition in parkinson's disease
Copland, David A.; Sefe, Gameli; Ashley, Jane. - : Elsevier Masson, 2009
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6
The basal ganglia circuits, dopamine, and ambiguous word processing: A neurobiological account of priming studies in Parkinson's disease
Chenery, Helen J.; Angwin, Anthony J.; Copland, David A.. - : Cambridge University Press, 2008
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7
Transdermal nicotine modulates strategy-based attentional semantic processing in non-smokers
Holmes, Anna D.; Chenery, Helen J.; Copland, David A.. - : Cambridge University Press, 2008
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8
Neural correlates of semantic priming for ambiguous words: An event-related fMRI study
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9
The speed of lexical activation is altered in Parkinson's disease
Angwin, Anthony J.; Chenery, Helen J.; Copland, David A.. - : Taylor & Francis Inc, 2007
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10
Self-paced reading and sentence comprehension in Parkinson's disease
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11
Summation of semantic priming and complex sentence comprehension in Parkinson's disease
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12
Hemispheric contributions to lexical ambiguity resolution: Evidence from individuals with complex language impairment following left-hemisphere lesions
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13
Discourse priming of homophones in individuals with dominant subcortical lesions, cortical lesions, and Parkinson’s disease
Copland, David A.; Chenery, Helen J.; Murdoch, Bruce E.. - : Psychology Press, 2001
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