Dear SPM experts,
We are considering an fMRI experiment on emotion. We'd like to adopt a same experiment paradigm from an ERP study. However, the ERP experiment last about 18 minutes. I am a bit worried that this 18 min long time could be problematic for fMRI study. The MR signal drift could confound the results, and it is a block design (mixed design actually). Although the technician from Philips says that they have some special manipulation to control the MR signal drift. I am not sure about that. Also too long time may induce fatigue of subjects, as they somehow tend to be sleepy lying in the MRI scanner.
Did anyone here perform such long-time fMRI session before?
Any suggestions/hints could be much appreciated. Thank you very much!
Best regards,
Gao
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