Validation Study: Mobile DSST on Cognition in Adults With MDD

The DSST is a paper-and-pencil cognitive test presented on a single sheet of paper that requires a subject to match symbols to numbers according to a key located on the top of the page. The subject copies the symbol into spaces below a row of numbers. The number of correct symbols within the allowed time, usually 90 to 120 seconds, constitutes the score.

Code breaker is the mobile/electronic version of the pen and paper DSST which is capable of identifying deficits in the domains of executive function, processing speed and attention/concentration, and takes 2 minutes to complete. Six symbols are numbered consecutively. Users are presented with a series of numbers that they must then match with the correct corresponding symbol as quickly as possible. Users are scored on speed and accuracy.