Symbol Digit Modalities Test.

SDMT

What it measures

Processing speed, sustained attention, working memory (substitution)

Length and format

9 symbol-digit key; substitute as many as possible in 90 seconds (max ~110). speeded symbol-digit substitution, oral or written (performance), correct substitutions (performance/ability test)

Language versions

Used worldwide; largely language-free; localized norms (and oral version for motor impairment)

Normative data

No normative data held in our reference library for this instrument. That is a statement about our library, not about the published literature.

Licence

copyrighted - commercial

This instrument is not self-serve. Obtaining it means going to the publisher or the author. We hold no direct link for it; the reference below is the citation to search from.

Licence classification is a research judgement by the catalogue’s authors, not legal advice, and it can be out of date. Confirm terms with the copyright holder or publisher before using an instrument, especially for commercial use.

Reference

Smith A. Symbol Digit Modalities Test. Western Psychological Services; 1982.