Fig. 2.
Changes in sensorimotor power and coherence in an example subject. Time frequency representation of power for three cortical signals investigated (top to bottom), indicating local power increase for frequencies less than 100 Hz similarly at all sensorimotor cortices (immediately posterior to the central sulcus [post-CS], spanning the central sulcus [CS], and immediately anterior to central sulcus [pre-CS]; A). Dashed vertical line indicates timing of propofol injection (bolus). Time frequency representation of coherence (i.e., coherogram) between signals recorded from pre- and postcentral gyri (preCS and postCS, respectively) (B; from the sample subject as in A), indicating de-coherence in β (13 to 30 Hz) between sensory and motor cortices.