Fig. 1.

$t$-Value color maps for each task and channel. $t$-Values that are greater than 3.5, 3.0, 2.5, and 2.0 are indicated by red, orange, yellow, and green circles, respectively, and those lower than 2.0 by white circles. (a) Task 1 is the visual-based oddball task (OBT) evoking right-laterilized focused activation. (b) Task 2 is the verbal category fluency task (CFT) evoking left-lateralized moderately focused activation. (c) Task 3 is the naming task (NMT) evoking bilateral diffused activation.