[FieldTrip] DICS conditions comparison
dimitri.bayle at inserm.fr
Tue Jun 28 15:14:43 CEST 2011
I have a general question about source analysis comparison.
I want to compare visual alpha deactivation between 2 conditions (A and
B), both containing a baseline (pre) interval and a poststimulus
interval, and both showing a strong occipital visual deactivation when
comparing the relative contrast ((preA-postA)/preA).
To compare A and B, should i calculated a common filter for the baseline
and another one for the poststimulus interval, or used the same filter
(calculated on which interval)?
After applying the filter to all individuals trials (pre and post
stimulus), is it better to 1) average alls trials, then calculated the
relative contrast for A and for B ((pre-post)/pre)), and
substract A and B relative
contrast to reveal the difference
or 2) calculated the relative contrast for each individuals trials, then
average all relatives contrast per conditions (A and B), and substract A
Thanks for your help
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