Hi all,
this question applies to protocols during which it is necessary to give verbal instructions to the examined subject between each volume scan and the following one.
In order to avoid the noise caused by scanning, we acquire a volume scan in 3s and we leave 1s interval between two consecutive volume scans.
In this case, which is the value of TR? How can I tell to AFNI about the 1s interval? If I tell AFNI TR=3 or TR=4 which are the consequences on the analysis results and which steps of the analysis process are markedly influenced by this choice (obviously the stimulus reference waveforms, but what else?)

I thank you in advance for your help.

Silvia