Behavioral and EEG results. In a visual working memory task, compared with younger adults (blue), older adults (red) are less accurate (A) and respond more slowly (B), with more variability (C). D, The slope of the low-frequency power spectrum in the a priori visual cortical region of interest (F, white outline) is flatter in older adults compared with younger adults. 1/f noise is estimated from the slope of the power spectrum (dashed lines), ignoring alpha oscillatory power (shaded region, 7–14 Hz). E, Older adults have more visual cortical 1/f noise compared with younger adults. F, This effect is most prominent in visual extrastriate, parietal, and midline frontal cortex. Error bars indicate SEM.