Psychtoolbox>Datapixx.{mex*} subfunction

Datapixx(‘EnableVsyncMode’);

Turns on the Vsync mode for on digital out 23.
VSync mode will send the VSYNC signal from the graphic card
to the digital output 23 (pin 25). If pixel mode is active, it willtake
priority.

###See also: DisablePixelMode, DisableVsyncMode