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Age-related delay in information accrual for faces: Evidence from a parametric, single-trial EEG approach

By G. Rousselet, J. Husk, C. Pernet, C. Gaspar, P. Bennett and A. Sekuler

Abstract

Background: In this study, we quantified age-related changes in the time-course of face processing \ud by means of an innovative single-trial ERP approach. Unlike analyses used in previous studies, our \ud approach does not rely on peak measurements and can provide a more sensitive measure of \ud processing delays. Young and old adults (mean ages 22 and 70 years) performed a non-speeded \ud discrimination task between two faces. The phase spectrum of these faces was manipulated \ud parametrically to create pictures that ranged between pure noise (0% phase information) and the \ud undistorted signal (100% phase information), with five intermediate steps. \ud Results: Behavioural 75% correct thresholds were on average lower, and maximum accuracy was \ud higher, in younger than older observers. ERPs from each subject were entered into a single-trial \ud general linear regression model to identify variations in neural activity statistically associated with \ud changes in image structure. The earliest age-related ERP differences occurred in the time window \ud of the N170. Older observers had a significantly stronger N170 in response to noise, but this age \ud difference decreased with increasing phase information. Overall, manipulating image phase \ud information had a greater effect on ERPs from younger observers, which was quantified using a \ud hierarchical modelling approach. Importantly, visual activity was modulated by the same stimulus \ud parameters in younger and older subjects. The fit of the model, indexed by R2, was computed at \ud multiple post-stimulus time points. The time-course of the R2 function showed a significantly slower \ud processing in older observers starting around 120 ms after stimulus onset. This age-related delay \ud increased over time to reach a maximum around 190 ms, at which latency younger observers had \ud around 50 ms time lead over older observers. \ud Conclusion: Using a component-free ERP analysis that provides a precise timing of the visual \ud system sensitivity to image structure, the current study demonstrates that older observers \ud accumulate face information more slowly than younger subjects. Additionally, the N170 appears to \ud be less face-sensitive in older observers

Topics: BF
Publisher: Biomed Central
Year: 2009
OAI identifier: oai:eprints.gla.ac.uk:45709
Provided by: Enlighten

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