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September 18, 2006

"Physical Activity Moderates Time-of-Day Differences in Older Adults' Working Memory Performance"

"Experimental Aging Research
Issue: Volume 32, Number 4 / October-December 2006
Pages: 431 - 446
URL: Linking Options

Physical Activity Moderates Time-of-Day Differences in Older Adults' Working Memory Performance

Julie M. Bugg A1, Edward L. DeLosh A1, Benjamin A. Clegg A1

A1 Department of Psychology, Colorado State University, Fort Collins, Colorado, USA


Based on a synthesis of the literature on time of day and physical fitness effects on cognition, the current study examined whether physical activity moderated time-of-day differences in older adults' performance on a working memory task. Sedentary older adults' working memory performance declined significantly from morning to evening, whereas more active older adults performed similarly across the day. This interaction did not extend to performance on a simple reaction time task. A novel explanation based on the selective effect of mental fatigue on executive control processes is proposed."

September 14, 2006

"Balance and dyslexia: An investigation of adults’ abilities"

European Journal of Cognitive Psychology
Issue: Volume 18, Number 6 / November 2006
Pages: 909 - 936

Balance and dyslexia: An investigation of adults’ abilities

Jamie L. Needle A1, Angela J. Fawcett A1, Roderick I. Nicolson A1

A1 Department of Psychology, University of Sheffield, Sheffield, UK


Balance ability in dyslexia is an issue of considerable theoretical and applied significance, but the literature currently lacks consensus. This study applied objective measures to established balance tasks. 17 dyslexic adults and 20 controls matched for age and IQ undertook the heel-to-toe balance test for 1 minute. Further “dual task? tests were also undertaken in which the subject had to balance while undertaking secondary cognitive tasks (counting, slow choice reaction, fast choice reaction). Two factor analyses of variance revealed significant between-group balance differences in the dual task conditions. 24–82% of the dyslexic group showed balance impairment, depending on the criterion chosen. At the group level, the results are directly consistent with the Nicolson and Fawcett (1990) automatisation deficit hypothesis, but the considerable within-group heterogeneity deserves further investigation.