ShowPlay Reference Manual, Chapter 3 (ControlVariables): atrig_chan
The ATRIG_CHAN variable is used to specify which external signal line to use for triggering the start of a paradigm.
ATRIG_CHAN is used in conjunction with TRIG_FLAG and TRIGTYPE, which indicate when and how to look for external trigger signals. Other parameters (ATRIG_VAL, DSTARTMASK) are also used to specify exactly what aspect of the external signal qualifies as a trigger.
See Also:
Trig_flag,
Trigtype,
Atrig_val,
Dstartmask)
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