Dear SPM'ers,
I would like an opinion on the following issue:
we have submitted a paper on a PET experiment, where we collected data
from 11 volunteers and performed different comparisons between 3
experimental conditions and a baseline with SPM96. During the experiment,
we collected on-line reaction times and accuracy scores. In the paper we
report that the behavioral performances (both reaction timies and
accuracy) of the 11 subjects were significantly different from each other
(p=0.0001). However, we didn't include the behavioral scores in any way in
the SPM analysis (one reason was that we had no hypothesis about any
possible physiological impact of the behavioral scores).
We now have been asked from a referee to include the behavioral
data for each single subject in the SPM analysis as a confound.
Are you aware of any publications, where as a similar approach was
adopted? And, more in general, do you think such an approach would be
correct?
Thanks a lot for your help,
Marco Tettamanti
Istituto Scientifico San Raffaele
Reparto Medicina Nucleare
Via Olgettina 60
I-20132 Milano
Italy
Tel. 0039 - 02 - 26 42 34 60
Fax: 0039 - 02 - 21 71 75 58
email: [log in to unmask]
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