SPM99 will accept fractional scans in the vector of onsets (e.g. 0.8 2.3 4.2 ...). When using an impulse type stimulus, if the stimuli are not in synchrony with the epi scans, should the actual onset times be expressed in fractional scans?
Perhaps SPM99 accepts non-integer data and then rounds the data to the closest integer.
Jerry Allison
Medical College of Georgia
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