Dear all,
I have a question regarding how to determine p-value related to
spatial extension (voxel number) in a conjunction analysis using
spm99. I noticed that spm99 does not provide any p-value for spatial
extension for conjunction analysis, in contrast to simple contrasts.
My understanding is that statistical assumptions underlying
computations of those p-values are no more valid in conjunctions of
contrasts. Is it right? If so, how can we decide significant spatial
overlap between several contrasts. Any insights, help or references
adressing this question would be greatly appreciated. Thank you.
Etienne.
Etienne Koechlin, PhD.
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Cognitive Neuroscience Section
National Institute of Health
MNB/NINDS/Bdg 10, Room 5c206
BETHESDA, MD 20892, USA
Tel: (301) 435-1583
Fax: (301) 480-2909
INSERM U483
Universite Pierre et Marie Curie,
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75005 PARIS, FRANCE
Tel: (1) 44 27 37 47
Fax: (1) 44 27 34 38
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