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I agree with Jeramy, it all depends on how accurate you want to be. If very accurate, i.e milliseconds, you may have difficulties, because windows timing is very hit and miss (about 55ms on 98, 10ms on 2000/xp), made even worse if using the keyboard or mouse as an input device. For accurate timing you ideally need a program that uses the timing from a source such as the sound card and then use an input device (e.g. a switch) attached to the parallel port. You can then use the timer to poll the parallel port for input. We wrote a program in visual basic that did such a task and managed to get very fast and more importantly repeatable results. Let you know if you need any help and i'll try and find it. Jim Hatton. -----Original Message----- From: Research of postgraduate psychologists. [mailto:[log in to unmask]]On Behalf Of John Brennan Sent: 27 November 2003 10:45 To: [log in to unmask] Subject: Reaction time measurement. Hi all, I was wondering if anybody knows of (or knows someone who might of) a computer package that would allow me to present a particular stimulus to a participant and record their reaction time (ideally a free one that I could download off the internet) but any suggestions at all would be greatly appreciated. Thanks a million. John Brennan. ________________________________________________________________________ This email has been scanned for all viruses by the MessageLabs Email Security System. For more information on a proactive email security service working around the clock, around the globe, visit http://www.messagelabs.com ________________________________________________________________________ --- Incoming mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.544 / Virus Database: 338 - Release Date: 25/11/2003 --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.544 / Virus Database: 338 - Release Date: 25/11/2003