Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/52653
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Type: Journal article
Title: Free testosterone levels, attentional control, and processing speed performance in aging men
Author: Martin, D.
Burns, N.
Wittert, G.
Citation: Neuropsychology, 2009; 23(2):158-167
Publisher: Amer Psychological Assoc
Issue Date: 2009
ISSN: 0894-4105
1931-1559
Statement of
Responsibility: 
Martin, Donel M.; Burns, Nicholas R.; Wittert, Gary.
Abstract: Psychometric measures of processing speed are strong predictors of cognitive functioning with aging; however, the neurobiological mechanisms underlying this association remain unclear. Recently, the authors reported a negative association between calculated free testosterone levels (cEFT) and processing speed in men aged between 50 and 70 years (Martin, Wittert, Burns, & McPherson, 2008). Ex-Gaussian decomposition of reaction time (RT) distributions allows for the robust estimation of skew in the distribution, which may reflect poorer attentional control. In a reanalysis of data from this previous study, the authors examined the associations between age, cEFT levels, and ex-Gaussian parameters derived from four RT tasks as predictors of cognitive functioning performance in 96 middle-to-older aged men. Results indicated that cEFT levels were significantly associated with increased skew in the RT distribution (i.e., the exponential portion) but not with the estimates derived from the Gaussian portion of the curve. Further, path analysis across the entire data set showed that this association was a strong predictor of processing speed performance. Taken together these results suggest that cEFT levels moderate cognitive functioning performance in males via attentional control processes.
Keywords: Humans; Testosterone; Sex Hormone-Binding Globulin; Immunoenzyme Techniques; Analysis of Variance; Normal Distribution; Predictive Value of Tests; Problem Solving; Choice Behavior; Attention; Reaction Time; Intelligence Tests; Neuropsychological Tests; Age Factors; Aging; Adult; Aged; Middle Aged; Male
RMID: 0020090338
DOI: 10.1037/a0014182
Appears in Collections:Psychology publications

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