Figure 1.

Block diagram of the analysis procedure employed in this study. The whole procedure can be roughly divided into the five basic steps enumerated in the diagram: 1) data recording and selection of epoch length; 2) local field potential (LFP) estimation for all voxels and epochs (trials); 3) power spectral density estimation for each estimated LFP; 4) feature selections using the first half of the trials (learning set); and 5) categorization of the cognitive state over the second half of the trials (validation set).