DMDX Help.


DMDX 6

    Last Updated : 08/07/25 j.c.f. 

    This is the help for DMDX version 6 (current version number is here), Dmastr for Win32 (Windows 7, 8, 8.1, 10 and 11) 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 written by Jonathan C. Forster at the University of Arizona and continues to be maintained by him. 
 

 

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. https://doi.org/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:

  1. Send a message to list@list.arizona.edu from the address you want to subscribe to the list.
  2. 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 made to dmdx@list.arizona.edu. Please don't send attachments to the list. Your subscription should also be manageable by pointing your browser at https://list.arizona.edu/sympa/info/dmdx.

There are some exceptions to this rule, notably if the characters you're using are in the code page the machine is using you could probably get away without quotes before version 6.4. OTOH if your file name has spaces in them quotes are likely to still be needed...