Typical time course of the hemoglobin concentration changes at channel 18 over the prefrontal cortex. (a) The result of finger tapping task at the first trial period (top) and the 15th trial period (bottom). (b) The result of circle drawing task at the first trial period (top) and the fourth trial period (bottom).
Matsuzaki et al. BMC Neuroscience 2010 11(Suppl 1):P87 doi:10.1186/1471-2202-11-S1-P87