Dear SPM experts,
Let me re-phrase my previous post from yesterday regarding high-pass filter settings. I know that there has been a lot written about HPF in the archives. However, I couldn't figure out if the the rule of thumb (2*the longest time between onset of consecutive epochs of the same type) applies also to sparse-sampling experiments, i.e. would the constant delay (7.2s) in TR (10s) affect the rationale for choosing the HPF?
In our specific case, we concatenate 6 same-type conditions for our sparse sampling experiment: a a a a a a b b b b b b a a a a a a b b b b b b c c c c c c b b b b b b etc. So we have alternating 60s blocks (6 x a TR of 10s) randomly distributed throughout the experiment. a) is a motor task, b) is a perception condition, and c) is a silent baseline. The biggest minimum interval would be 180s (6 x a, 6 x b, 6 x c) x 2. Though, would 460s for HPF be reasonable?
Many thanks for your suggestions!
Boris A. Kleber (PhD)
Institute of Medical Psychology and
Director: Prof. N. Birbaumer
University of Tübingen
Fax.: +49-7071 -29-5956
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