Activation vs. baseline

Pascal Fries pascal.fries at FCDONDERS.RU.NL
Mon Feb 27 10:05:00 CET 2006

Dear Vladimir,

what aspect of the two data pieces are you comparing? Power? Coherence?
Amplitude? At the sensor or at the source level?

Best, Pascal

Pascal Fries
Principal Investigator
Neuronal Coherence Group
F. C. Donders Centre for Cognitive Neuroimaging
Radboud University Nijmegen

Kapittelweg 29
6525 EN Nijmegen
The Netherlands

Phone: (+31) (0)24 36 10657
Fax:   (+31) (0)24 36 10989
e-mail: pascal.fries at


From: FieldTrip discussion list [mailto:FIELDTRIP at NIC.SURFNET.NL] On Behalf
Of Vladimir Litvak
Sent: Monday, February 27, 2006 9:24 AM
Subject: [FIELDTRIP] Activation vs. baseline

Dear Eric and all,

I'm playing with 'Activation vs. baseline' option in clusterrandanalysis.
The problem is that my baseline is about 100ms while the activation period
is 300 ms. I cannot extend the baseline since the raw data I have is already
segmented. What is the right thing to do in this situation? Should I divide
the activation period into 3 segments and test them separately? Or maybe
replicate the baseline 3 times, concatenate and use this as baseline for the
whole period?



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