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Aging is normally associated with increased predictability of neurophysiological processes. To test the related prediction of age-related increase in the Hurst exponent, H, of functional MRI time series, and its possible cholinergic mechanisms, two groups of healthy participants (old [mean age=65 years]; young [mean age=22 years]; N=11 per group) were scanned twice at rest, following placebo and a...
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