Fig. 7.

The results of BCPD for working memory tfMRI data (session 1, LR). The upper panels are the cumulative discrepancy energy (CDE) with different sliding window sizes ($W$ = 22, 26, 30, and 34; a–d under the model $K$ = 3) and different models ($K$ = 3, 4, and 5; c, e and f using a sliding window of $W$ = 30). $W_s$ is width of the sliding window used for converting from PPDI to CDE. The vertical dashed lines are the times of onset of the stimuli (which were provided in the EV.txt files in the released data). The multi-color scatter plots in the figures represent the CDEs of individual subjects and the black curve is the group-level CDE (averaged over 100 subjects). The red dots are the local maxima, which are taken to be the locations of change-points, and the blue dots are the local minima, which are used for local inference of the discrete brain states. The bottom panels show the estimated group-averaged CDE where false positives (FP) are removed using time distance threshold $\tau$ = 7. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)