**ShowPlay Reference Manual, Chapter 4 (StimulusEvents): twait**
===== Twait -- Wait for a trigger =====
**usage: twait id flg start **
===== =====
The TWAIT event causes Showplay to pause at the specified time and wait for the next trigger event. Trigger events are controlled by the setting of the [[jvs:cigal:showplay:manual:chapter3:physioflag|physio_flag]] control variable.
Triggers can be based on physiological analog signals such as heart beat or respiration, or external synchronization pulses such as that generated by the MRI scanner itself.
**See Also:**\\
[[jvs:cigal:showplay:manual:chapter1:ppf|Paradigm parameter file]], 
[[jvs:cigal:showplay:manual:chapter1:stimulustable|Stimulus table]]

[[jvs:cigal|CIGAL Home]], 
[[jvs:cigal:manual|CIGAL Manual]], 
[[jvs:cigal:showplay|ShowPlay Home]], 
[[jvs:cigal:showplay:manual|ShowPlay Manual]], 
[[jvs:cigal:showplay:manual:chapter4|Stimulus Event List]], 
[[jvs:cigal:showplay:manual:help|Manual Help]]