Fig. 9From: Incremental rate of prefrontal oxygenation determines performance speed during cognitive Stroop test: the effect of ageingRelationships between the peak (µM cm) of the Oxy-Hb response and cognitive performance speed (answers/s) during the Stroop test (a) and word-reading test (b) across the data consolidated in nine young (white circles) and nine elderly subjects (black circles)Back to article page