[FieldTrip] beamformer

[Frank Mei]

Hello FieldtripList,

In the beamformer tutorial (
http://fieldtrip.fcdonders.nl/tutorial/beamformer), the contrast of
(post-pre)/pre was calculated. I am wondering why can't one just
calculate (post-pre), instead.

Could someone explain that?

thanks,
Ye Mei
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