This is an old revision of the document!
The video AND audio connections between the computers, dvd player, monitors, 3D LCD at each scanner pass through a software-controllable video switching box. The box is located in the rack that contains the 2 stimulus control PC's in the scanner equipment room.
Currently at BIAC6 the video switching box only connects the audio/video signals. The keyboard and mouse devices on the console desk are connected directly to their respective computers and cannot be changed. This means you will probably find it hard to work if you connect monitor 1 to CPU 2 (or vice-versa) because the keyboards and mice will be linked to the wrong screens.
The monitors contain integrated speakers and there is an HDMI audio extraction device connected to the subject's headphones as input. This means that the audio signal to the subject is just another connection controlled by the switching software.