Brain Imaging & Analysis Center

The TRIG_FLAG variable is used to allow an external signal to trigger the start of a paradigm.

Values for TRIG_FLAG are:

 0 - do not look for external trigger
 1 - start on external trigger or manual trigger
 2 - record external trigger events for every T_R interval
 4 - start on manual trigger only
 8 - quick start -- ignore DISDAQS
16 - immediate start -- ignore 1 & 4 flags
32 - immediate start -- skip "Ready to Scan" alert box

TRIG_FLAG is used in conjunction with TRIGTYPE, which indicates which external signal is to be used for the trigger. Other parameters (ATRIG_CHAN,ATRIG_VAL, DSTARTMASK) are also used to specify exactly what aspect of the external signal qualifies as a trigger.

See Also:
Trigtype, Disdaqs, Atrig_chan, Atrig_val, Dstartmask
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