Fig. 7

Spatial distributions of the three components (initial slope, peak, and area under the curve) of the Oxy-Hb response averaged over the Stroop 2–4 trials (a) and over the word-reading 2–4 trials (b) in nine young and nine elderly subjects. Each circle with thin lines indicates a significant difference (P < 0.05) from the baseline before the cognitive test. Each circle with thick lines indicates significant differences (P < 0.05) from the baseline and between the two age groups. An x indicates no significant difference (P > 0.05) from the baseline control