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Correlation between changes in deoxyhemoglobin concentration ([HHb]) as measured by NIRS and changes in BOLD‐fMRI signal over the left motor cortex in healthy young (n = 6, —•—) and elderly subjects (n = 5, —○—) during a 60‐sec period involving 20 sec of contralateral finger‐tapping and 40 sec of rest. For each subject, the time‐locked average changes over 7 cycles of finger‐tapping are shown, including 15 points of 4‐sec periods.
