Hi all,
we are trying to specify a bloc design fMRI analysis with variable
durations within trials. When we enter variable durations:yes, SPM asks
to specify the number of scans. Later on this number (vector) has to
be specified again. The resulting design matrix seems to make no sense to
us. Entering "no", SPM allows to specify the length of the different
epochs of each trial by entering a vector. The resulting design matrix
seems to be ok. Can anyone tell us what is the sense - and how to use -
the function "variable durations" within SPM99?
Any help would be highly appreciated.
Bernhard
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Dr. Bernhard Haslinger
Neurologische Klinik und Poliklinik
Klinikum Rechts der Isar
Technische Universitaet Muenchen
Moehlstrasse 28
D-81675 Muenchen
E-mail: [log in to unmask]
phone: ++49/89/4140/4699
fax: ++49/89/4140/4966
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