Fig. 2.

Grand average time-frequency changes associated with cortical bursts. Examples are provided for bursts identified at channels overlying different brain hemispheres and regions (upper panel: right central, C4; lower panel: left frontal, F3). Power changes between 0.2 and 40 Hz (logarithmic scale) are shown in decibels, relative to the mean power throughout the 11 s preceding burst onset (black vertical line), where increased power is shaded red and decreased power is shaded blue. Note the small ‘hotspot’ of particularly increased power at circa 8 Hz (dark crimson).