Figure 6.

(a) A marked effect on a TTR component of removing the CTR component. The CTR component for trial 1 (Upper) had areas of activation in predominately posterior regions. The same ICA decomposition revealed TTR activation during the second experimental block (blue rectangle) whose map voxel distribution was constrained by the algorithm to be independent to the CTR component (Lower Left). Application of ICA after the removal of the CTR component (by Eqs. 11–18) again revealed a TTR component with strong mesial frontal activation (Lower Right). (b) Scatter plot showing the effects of removal of the CTR component on a TTR component. Here, CTR-component removal had a significant effect on the map voxel values, in contrast to Fig. 5. Yellow voxels denote activation with the time course shown, and blue voxels denote suppression with the same time course.