Activation vs. baseline

[Pascal Fries]

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 fcdonders.ru.nl
website: www.ru.nl/fcdonders/




  _____

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



Thanks,



Vladimir

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