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Neural Correlates and Temporal Dynamics of Task-Switching in Normal Aging


Karayanidis, F and Whitson, LR and Michie, PT and Heathcote, A, Neural Correlates and Temporal Dynamics of Task-Switching in Normal Aging, Proceedings of the 9th Conference of the Australasian Society for Cognitive Science, Sept 30 - Oct 02, 2009, Sydney, Australia, pp. 1-8. ISBN 978-0-646-52918-9 (2009) [Refereed Conference Paper]

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Copyright 2009 Australasian Society for Cognitive Science

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Task-switching paradigms consistently show an age-related increase in mixing cost i.e., older adults show a greater increase in RT on repeat trials in mixed-task blocks as compared to single task blocks. We examined changes in mixing cost in four age groups spanning across the adult lifespan using a cued trials switching paradigm. We compared behavioral variables and latent variables derived from evidence accumulation models of speed-accuracy trade-off against electrophysiological variables measuring preparation for an impending repeat trial and stimulus processing. Increasing age was associated with a higher RT and greater RT variance mixing cost but smaller error mixing cost, suggestive of age-related changes in speed-accuracy tradeoff. Diffusion model parameters indicated a more conservative decision process under mixed-task conditions in older adults. Cue-locked ERPs showed a prolongation of the mixingpositivity across the lifespan and this was associated with greater criterion increase for mixed-repeat trials. Stimuluslocked ERPs showed gradual changes in the mixing effect across the lifespan and this was associated with drift rate reduction for mixed-repeat trials. The results suggest that the early emergence of strategic differences in response criterion may modulate preparatory processes. These do not adversely affect behavioral performance until slowing of the rate of evidence accumulation in older adults makes this strategy ineffective. The analysis strategy used here indicates that diffusion model parameters and ERP measures are complementary approaches that can illuminate the processes that contribute to age-related cognitive changes.

Item Details

Item Type:Refereed Conference Paper
Keywords:Cognitive Control; Normal Ageing, Mixing Cost; Event-Related Potentials; Evidence Accumulation Parameters
Research Division:Psychology
Research Group:Cognitive and computational psychology
Research Field:Decision making
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in psychology
UTAS Author:Heathcote, A (Professor Andrew Heathcote)
ID Code:98994
Year Published:2009
Deposited By:Medicine
Deposited On:2015-03-11
Last Modified:2016-02-16

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