The pre-built Siemens fMRI protocols seem to want to know details about the stimulation protocol (on-off periods, etc). Is it really necessary to provide these details to acquire data?
No. The stimulation protocol information is used to create t-test images as part of automatic data processing. This assumes a simple on-off protocol. You can use this feature if you want, but its validity should have no impact on the raw data that you collect. When appropriate, you may find t-test image helpful in providing an early look at your data (e.g., in deciding whether a pre-surgical fMRI study is of good quality).
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