Thanks Claus- yes, I suspect it's likely because of reason a) that you stated.
Meera
________________________________________
From: SPM (Statistical Parametric Mapping) [[log in to unmask]] On Behalf Of Claus Lamm [[log in to unmask]]
Sent: Thursday, March 31, 2011 1:31 PM
To: [log in to unmask]
Subject: Re: [SPM] "dalmation" pattern in data
This reminds me of a pattern I got twice in the past, when
a) not smoothing my data
b) when analyzing data that had been preprocessed on a Linux system on
Windows (or the other way round)
Cheers,
Claus
-----Original Message-----
From: SPM (Statistical Parametric Mapping) [mailto:[log in to unmask]] On
Behalf Of Meera Paleja
Sent: Donnerstag, 31. März 2011 19:20
To: [log in to unmask]
Subject: Re: [SPM] "dalmation" pattern in data
Hi Alexander,
I've attached the screenshot. This is what I'm seeing for single
participants. I haven't done a group analysis yet since I only have 5 people
in my sample so far. Does this effect normally disappear when I've done a
2nd level analysis?
Meera
________________________________________
From: Alexander Hammers [[log in to unmask]]
Sent: Wednesday, March 30, 2011 4:50 PM
To: Meera Paleja
Cc: [log in to unmask]
Subject: Re: [SPM] "dalmation" pattern in data
Dear Meera,
I may have missed the screenshot. What you describe sounds like what happens
with very few degrees of freedom - unlikely to be a problem with fMRI, but
how many did you have?
ATB,
Alexander
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Alexander Hammers, MD PhD
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