Fig. 3

Comparison of mean oxy-Hb concentrations in the prefrontal cortex after 90 s of olfactory stimulation by air-dried or high-temperature-dried hinoki cypress wood chips. The oxy-Hb concentration shown is the difference between the pre- and postmeasurement conditions. Data are expressed as mean ± SE; n = 19; **P < 0.01, paired t test