Alpha-band activity in patients and healthy controls.

<p>(A) Instantaneous alpha-band amplitude, collapsed across contrast conditions, in patients and controls. The traces correspond to the average activity between the three electrode sites illustrated in the head model (B). This figure shows the topographical distributions for each time period of interest in controls and patients. The data show a focal bilateral distribution in pre-stimulus alpha for the controls and patients (patients’ activity is substantially reduced). The post-stimulus alpha topography shows a weak parieto-occipital central distribution for the controls. The ERD topography in both groups shows a bilateral distribution with higher activity over the right hemisphere. (C) This figure illustrates alpha differences between groups. The data shows greater activity in controls vs. patients in every measure. LH = left hemisphere, RH = right hemisphere. Red traces and bar graphs correspond to activity of healthy controls, while blue traces and bar graphs correspond to activity of patients.