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All fields Title Creator / Publisher Keyword Year AND OR AND NOT All fields Title Creator / Publisher Keyword Year AND OR AND NOT All fields Title Creator / Publisher Keyword Year AND OR AND NOT All fields Title Creator / Publisher Keyword Year AND OR AND NOT All fields Title Creator / Publisher Keyword Year Sort by creator [A → Z]' creator [Z → A]' publishing year ↑ (asc)' publishing year ↓ (desc)' title [A → Z]' title [Z → A]' Simple Search Hits 1 – 3 of 3 1 Semantic activation in Parkinson's disease patients on and off levodopa Angwin, Anthony J.; Arnott, Wendy L.; Copland, David A.; Haire, Miriam P. L.; Murdoch, Bruce E.; Silburn, Peter A.; Chenery, Helen J.. - : Elsevier Masson, 2009 Abstract: Research suggests that dopamine may exert a neuromodulatory influence on automatic spreading activation within semantic networks. In order to investigate the influence of dopamine depletion on semantic activation in Parkinson's disease (PD), nine patients with PD performed a lexical decision task when on and off levodopa medication. Eleven healthy controls matched to the PD patients in terms of sex, age and education also participated in the study. Both directly related word pairs (e.g., tiger - stripe) and indirectly related word pairs (word pairs related via a mediating word, e.g., chalk - black) were used to measure semantic activation across stimulus onset asynchronies (SOAs) of 270 msec, 520 msec and 1020 msec. Analysis of variance statistics revealed that the activation of directly related and indirectly related targets was slower for the PD group relative to the control group. Within group comparisons revealed further changes to semantic activation in PD patients off medication, with no activation of directly or indirectly related target words evident in PD patients off medication. These results further clarify the nature of dopamine's neuromodulatory influence on semantic activation, and suggest that the nature of altered semantic activation in PD may depend on the magnitude of dopamine depletion. (C) 2009 Elsevier Srl. All rights reserved. Keyword: 170204 Linguistic Processes (incl. Speech Production and Comprehension); 920201 Allied Health Therapies (excl. Mental Health Services); Automatic spreading activation; C1; Dopamine; Language; Parkinson's disease; Semantic priming; Spreading activation URL: https://espace.library.uq.edu.au/view/UQ:180359 BASE Hide details 2 Semantic priming in Parkinson's disease: Evidence for delayed spreading activation Arnott, Wendy L.; Chenery, Helen J.; Murdoch, Bruce E.. - : Psychology Press, 2001 BASE Show details 3 Lexical decision in Parkinson's disease: A reply to Brown, McDonald, and Spicer (1999) Arnott, Wendy L.; Chenery, Helen J.. - : Swets & Zeitlinger, 2001 BASE Show details

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