Symbol Digit Modalities Test (SDMT) Alternate Forms

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Symbol Digit Modalities Test (SDMT) Alternate Forms

The Symbol Digit Modalities Test (SDMT) is used to assess divided attention, visual scanning, tracking and motor speed.

This test may be reproduced using the information provided below.

Alternate forms by Hinton-Bayre and Geffen (2005) are available and psychologists have permission to make their own by copying the forms on page 622 of the book, “A Compendium of Neuropsychological Tests” by Strauss, et al. (2006).  According to the authors, the forms must be printed on A4 sized pages.  The forms must be photocopied and enlarged so that the information under the forms (the form and copyright information) does not show.

The forms are also available on this website:

Research on the compatibility of the alternate forms to the original version found that there was reasonable alternate form comparability (Hinton-Bayre & Geffen, 2005).**

Norms for the original version of the SDMT can be found in Strauss, et al, (2006).

*Strauss, E, Sherman, E.M.S, & Spreen, O. (2006).  A Compendium of Neuropsychological Tests: Administration, Norms and Commentary. Oxford University Press, New York.

*Hinton-Bayre, A, & Geffen, G. (2005). Comparability, Reliability, and Practice Effects on Alternate Forms of the Digit Symbol Substitution and Symbol Digit Modalities Tests. Psychological Assessment, Vol 17(2), Jun 2005, 237-241.