> A very useful contribution would be a toolbox to perform this sorts of > checks. It could be ran on second computer connected to the stimulation > PC (to its audio ouput, its parallel port, and to its screen via a > photodiode). Not everyone knows how to use an oscilloscope or wants to > use one. Check out http://www.blackboxtoolkit.com/ Their hardware / software suite runs on a second PC and allows you to independently test many timing considerations. We have used the TTL input and photodiode functionality and they work very well. They also have a mic. input, tone generator, response pad, and active closure lead inputs that can be used to time actual physical button pressed on a keyboard or mouse. ====================================== The Vision Egg mailing list Archives: http://www.freelists.org/archives/visionegg Website: http://www.visionegg.org/mailinglist.html