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Differential Contribution of Cognitive and Psychomotor Functions to the Age-Related Slowing of Speech Production

Published online by Cambridge University Press:  05 July 2011

Claudia Rodríguez-Aranda  and
Mona Jakobsen
Claudia Rodríguez-Aranda*
Affiliation:
Department of Psychology, University of Tromsø, Norway
Mona Jakobsen
Affiliation:
Department of Psychology, University of Tromsø, Norway
*
Correspondence and reprint requests to: Claudia Rodríguez-Aranda, Department of Psychology, University of Tromsø, N-9037 Tromsø, Norway. E-mail: claudia.rodriguez-aranda@uit.no
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Abstract

Healthy elderly adults are slower to initiate and produce speech. However, the sources of the slowing remain poorly understood. The present study evaluates to which extent psychomotor and cognitive changes influence age-related slowing in speech generation. Four verbal tasks varying in degree of difficulty and cognitive demands were used to evaluate 30 young and 30 healthy elderly. Speed of word production was measured by reaction times and pronunciation durations. Stroop test and Digits backwards were used as cognitive predictors while the Purdue Pegboard and Finger Tapping were used as psychomotor predictors. The relative contribution of cognitive and psychomotor functioning was evaluated by hierarchical regression analyses and based on the processing speed hypothesis. Results showed that Vocabulary and psychomotor execution significantly explained a portion of the variance in RTs depending on type of verbal task. These variables explained 36% of the total variance in reading, 26% in naming, 31% in phonemic fluency and 47% in semantic fluency. Also, Vocabulary and psychomotor functions strongly predicted pronunciation speed. Conversely, tests related to executive functions and working memory were not significant predictors. These data demonstrate the importance of the interplay between Vocabulary and psychomotor decline on speed of language production among healthy elderly adults. (JINS, 2011, 17, 807–821)

Keywords

Cognitive agingAge-related psychomotor slowingVerbal tasksWord productionNormal agingVocabulary
Type
Regular Articles
Information
Journal of the International Neuropsychological Society , Volume 17 , Issue 5 , September 2011 , pp. 807 - 821
Copyright
Copyright © The International Neuropsychological Society 2011

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