Figure 3: NIRS topography (z map), and Δ[Hb] (red, Δ[Oxy-Hb]; blue, Δ[Deoxy-Hb]) in channels 11 (C3) and 34 (C4) during left hand grasping (affected hand in stroke patients). These channels are over the left and right sensorimotor cortex, which is closely associated with voluntary movement. A: contralateral-predominant pattern in normal subjects. B: contralateral-predominance in a patient with mild hemiparesis (Patient No.9). C: ipsilateralpredominance in a patient with moderate hemiparesis (Patient No. 2). D: bilateral activation in a patient with moderate hemiparesis (Patient No.3). Arrowhead: significance level of the topography.