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	Group: Forum MembersPosts: 9, 
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			            Hi there, 
 I want to insert a pretrialsignal at the beginning of each trial that waits for input from the MRI scanner, to sync up timing. I have read the documentation that outlines how to add in a pretrialsignal, however, it is not clear to me how I know or find out what signal that the scanner sends/that the script should wait for.
 
 Any help would be greatly appreciated!
 
 Best,
 Liz
 
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