Doug,
>From what I understand, spmhrf 0 calculates the amplitude of the the hrf
and spmhrf 1 derives the amplitude and the latency (which I thought was
the 2nd derivative). I am not sure how the latency calculation contributes
to the model but my contrast maps using spmhrf 1 are slightly different
from those generated using spmhrf 0. Here are the parts of the processing
stream relevant to the ROI analysis I used:
mkanalysis-sess.new -analysis retrievalSPMHRF1 -TR 2.5 -paradigm
paradigmmacro -designtype event-related -nconditions 3 -spmhrf 1 -funcstem
fmcsm -taumax 30
selxavg-sess -a retrievalSPMHRF1 -sf sessidall3cond -df sesspar
mri_annotation2label --subject SM2C1_autoreconall --hemi lh --outdir
SM2C1_autoreconall/labels
func2roi-sess -roidef L10noFmask -a retrievalSPMHRF1 -sesslabel
lh.parsorbitalis -sf sessidall3cond -df sesspar
roisummary-sess -sumfile L10noFmask -a retrievalSPMHRF1 -sf sessidall3cond
-df sesspar
I included an attachment of the roisummary that I receive after this final
step. I was only expecting 3 values, a value for each condition for each
subject, but I am not sure what the other three are. I think they are
related to the latency derivative but I don't know for sure nor do I know
which 3 correspond to the amplitude.
Thanks,
Cameron
Hard to say without knowing more about what's going on (which is why
it's good to err on the side of more detail). Did you use a derivative?
Cameron Ellis wrote:
Hello,
I am trying to interpret the results I receive from roisummary-sess. My
analysis models the hrf using spmhrf 1 and I have 3 conditions. However,
roisummary-sess generates 6 condition values for each subject. Does this
have something to do with the fact that spmhrf 1 calculates both
amplitude
and latency and is therefore giving me 2 numbers for each condition? If
so, which numbers correspond to which calculation? Help from anyone is
much appreciated...
Thanks,
Cameron
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