Age-related changes in global motion coherence: conflicting haemodynamic and perceptual responses

Ward, L. M. , Morison, G., Simmers, A. J. and Shahani, U. (2018) Age-related changes in global motion coherence: conflicting haemodynamic and perceptual responses. Scientific Reports, 8, 10013. (doi: 10.1038/s41598-018-27803-5) (PMID:29968729) (PMCID:PMC6030110)

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Our aim was to use both behavioural and neuroimaging data to identify indicators of perceptual decline in motion processing. We employed a global motion coherence task and functional Near Infrared Spectroscopy (fNIRS). Healthy adults (n = 72, 18-85) were recruited into the following groups: young (n = 28, mean age = 28), middle-aged (n = 22, mean age = 50), and older adults (n = 23, mean age = 70). Participants were assessed on their motion coherence thresholds at 3 different speeds using a psychophysical design. As expected, we report age group differences in motion processing as demonstrated by higher motion coherence thresholds in older adults. Crucially, we add correlational data showing that global motion perception declines linearly as a function of age. The associated fNIRS recordings provide a clear physiological correlate of global motion perception. The crux of this study lies in the robust linear correlation between age and haemodynamic response for both measures of oxygenation. We hypothesise that there is an increase in neural recruitment, necessitating an increase in metabolic need and blood flow, which presents as a higher oxygenated haemoglobin response. We report age-related changes in motion perception with poorer behavioural performance (high motion coherence thresholds) associated with an increased haemodynamic response.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Ward, Dr Laura
Authors: Ward, L. M., Morison, G., Simmers, A. J., and Shahani, U.
College/School:College of Medical Veterinary and Life Sciences > School of Health & Wellbeing > Mental Health and Wellbeing
Journal Name:Scientific Reports
Publisher:Nature Publishing Group
ISSN (Online):2045-2322
Copyright Holders:Copyright © 2018 The Authors
First Published:First published in Scientific Reports 8: 10013
Publisher Policy:Reproduced under a Creative Commons License

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