David, Looks like it just is the epochs that are labeled incorrectly, while the spectral analysis looks correct. The individual peak alfas (eyes closed) have been around 9-11Hz in our qEEGs of normal subjects, which is what one would expect. Maybe the labeling actually shows paper length? 500 seconds at 30 mm/s =3D 15000 mm paper =3D 1500 cm =3D150 desimeters (which is close to the no. "157". The labeling doesn=B4t seem to change when one changes the paper speed value though... -- Joe ______________________________________________________ Få den nye Yahoo! Messenger på http://no.messenger.yahoo.com/ Nye ikoner og bakgrunner, webkamera med superkvalitet og dobbelt så morsom