Last Updated : 11/12/18
This is the help
for DMDX version 5 (current version number is
here), Dmastr for Win32 (Windows XP, Vista, 7, 8,
8.1 and 10) with DirectX 9.0 or later. DMDX is a Win32-based display system used in psychological,
linguistic and other laboratories around the world to measure reaction times to visual and auditory stimuli. It was programmed by Jonathan Forster at the University of Arizona
and continues to be maintained by him. Version 1 worked on 486 class machines,
Version 2 of DMDX dropped support for 486 class machines allowing much more
accurate timing and generally cleaned up a lot of stuff like multi-monitor
support. Version 3 cut support for Windows 95, radically restructured the
Audio Input and introduced the DMDX installer and .CHM help files. Version 4
added Unicode support and addressed the long
standing trouble DMDX had with other applications stealing it's focus.
In addition version 4 also introduced Auto Mode that allows DMDX to operate
without the use of TimeDX. Version 5
added a Direct3D rendering path that is
required for Windows 8 and later operating systems as DirectDraw (the original rendering
API) is now emulated. Version 5 also dispenses with operating systems earlier than
Windows XP. Version 5.1 added support for
NVidia 3D shutter glasses and 5.2
adds support for AMD FreeSync
and NVidia G-Sync displays
Please note that we distribute this software as is, with no guarantees
as to its reliability. It may not be redistributed for sale.
The DMASTR software is distributed free of charge, and we ask only that you
acknowledge use of the system in publications (e.g., "The experiment was run
using the DMASTR software (DMDX) developed at Monash University and at the University
of Arizona by K.I.Forster and J.C.Forster."). You can also cite our
DMDX paper: DMDX: A Windows display program with millisecond accuracy.
Forster, K.I. & Forster, J.C. Behavior Research Methods,
Instruments, & ;Computers (2003) 35: 116. ;doi:10.3758/BF03195503.
Although the software has been in constant use for more than 20 years, it is
constantly evolving, and hence there is always the possibility that new
releases may contain bugs. We do not assume any legal responsibility for the
software, but we do assume the responsibility of advising you as rapidly as
possible of any bugs that we do detect. For this reason, it is important that
you get your name onto the user list serv if you plan to use the system on a
regular basis. To do so:
- Send a message to firstname.lastname@example.org from the
address you want to subscribe to the list.
- In the subject line of your message, type in: subscribe dmdx
Firstname Name (replace 'Firstname Name' by your
own first name and name).
Once your subscription is confirmed posts can be
email@example.com. Please don't send attachments to the list. Your
subscription should also be manageable by pointing your browser at