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Relationship of ΔCBF/ΔCMRO2 to behavior within visual cortex. Older and younger participants were designated as fast or slow responders based on median reaction time (RT) within each group. Error bars represent the semi-interquartile range. The resulting median ΔCBF/ΔCMRO2 ratios for each group from fixation illustrate the significant association between ΔCBF/ΔCMRO2 and RT, which was calculated across groups.
