Dear List,
I want to plot the response from a voxel using spm's plot function.
The experiment contains a block design with repetition of one identical
stimulation in two runs. Now we plotted the response of one activated voxel
using:
Plot
Event/Epoch related responses
Average over Sessions: Yes
which trial or condition: 2
plot fitted response and PSTH
We receive a plot with a red line showing the response of session1 and a
blue line showing response of session2.
Question1: What is the unit of 'response' ? Is it percent signal change ?
Question 2:
If we choose :
Average over Sessions: No
and plot the response from Session1 and 2 seperately, the two plots
look slightly different from the two lines we receive by plotting both
sessions
at once. Why this ?
Thank you for your time
Thomas Stephan
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Thomas Stephan Email: [log in to unmask]
Klinikum Grosshadern
Neurologisches Forschungshaus
Marchioninistr. 23 Fon: +49 089 / 7095-4819 *NEU*
81377 Muenchen Fax: +49 089 / 7095-4801
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