Sophie -
The 'mickey mouse' effect wouldn't bother me too much - the 'ears'
you see reflect 'activation' in the eyes, probably caused
by stimulus-correlated eye movements
However, something seems to be wrong with your normalization as the
functional images do not match the glass brain images (they look 'squeezed'
in the y-direction).
I attach an example of my own data, with the same mickey mousing but a much
exacter fit of the normalized data.
Hope this helps
C
-----Original Message-----
From: SPM (Statistical Parametric Mapping) [mailto:[log in to unmask]] On
Behalf Of Sophie Josee Lafaille
Sent: Tuesday, February 14, 2006 1:34 PM
To: [log in to unmask]
Subject: [SPM] SPM2 Normalization
I have normal subjects. (high res sag anat, spiral sag functional)
I rotate my images (Anat & Func) to appropriate SPM orientation, I realign
functionals, then I coregister my anat to my functionals. I use the T1
template
to normalize my anat and then then apply those parameters to my functionals.
Smoothing of course (10mm).
When I run stats and bring up my functional contrast at uncorrected 0.999 to
see
how well my functional data looks within the glass brain, I get some frontal
"mickey mouse" activation [see attached] I've never seen, before outside the
brain, and this is happening with multiple subjects (~8)
how do I correct this?
Do I need to change normalization parameters in the defaults, and which
ones?
should I mask?
sorry for such simple questions but I've never seen anything like this,
thanks, sophie
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