Voxel selection algorithm.

<p>(<i>A</i>) Penalized cross validation error for task-related (blue) and non-task-related (red) ROIs. (<i>B</i>) Penalized prediction error curve for the left DLPFC, smoothed by a Gaussian kernel (cyan). A minimum (non-penalized) prediction error of 0.327 = 0.505/(1 + ξ<i>p</i>/log<i>n</i>) was obtained for the overall separation of the six cognitive task stages; <i>p</i> is the number of voxels for this ROI (left DLPFC), <i>n</i> is the number of time points, and ξ = 1. (<i>C</i>) The most predictive voxels (marked in red) selected from a combined ROI mask (blue regions) were distributed across the DLPFC, OFC, ACC and hippocampus.