Trend plots of mean ICP/mean ICP wave amplitude of Signals 1 and 2 (PatID 15). The trend plots of mean ICP and mean ICP wave amplitude (MWA) of (a) Signal 1 and (b) Signal 2 of PatID 15 is shown [Average of mean ICP: -1.3 mmHg (Signal 1), 7.2 mmHg (Signal 2). Average of mean ICP wave amplitude: 8.7 mmHg (Signal 1), 5.5 mmHg (Signal 2)]. The vertical arrows in (a) and (b) indicate shifts in mean ICP; no apparent lasting changes in MWA were seen. The shifts of mean ICP in (a) and (b) were in opposite directions.