State- and frequency-specific beta pdfs for 9 human sessions.

The state-specific and frequency-band specific beta pdfs corresponding to a 6-state beta-HMM were estimated from L = 9 sessions of EEG recording from 9 human OR patients. For each state (viewed row-wise) and a frequency band (viewed column-wise), the corresponding subplot presents (1) the empirical pdf plotted as a histogram based on the observations that correspond to the optimal segmentation (Viterbi algorithm) across the L = 9 sessions, and (2) the continuous beta pdf with parameters estimated by the EM algorithm. Each color distinguishes a state as in Fig 6. (TIF)