d2-R
d2 Test of Attention - Revised (d2-R)
The d2-R is a standardized cancellation test that mainly assesses visual selective attention, concentration, and the maintenance of attentional efficiency under time pressure. The person must quickly identify the letters d with exactly two dashes among very similar distractors, which makes it possible to objectify the speed-accuracy trade-off, error proneness, and the stability of performance across lines. Widely used in neuropsychology, school psychology, and occupational assessment, it helps document concentration difficulties, cognitive fatigability, or a fragile attentional profile, while remaining relatively independent of overall intelligence level.
- Number of questions
- 70 questions
- Estimated duration
- 8 minutes
- Language
- English
- Original name
- d2 Test of Attention - Revised
- Target audience
- Ages 9 and up
- Authors
- Rolf Brickenkamp, Lothar Schmidt-Atzert, Detlev Liepmann (2010)
- Category
- General
Scoring & interpretation
Scoring is based on the number of targets processed, omissions, and commission errors. In the standard paper version, each line is timed at 20 seconds, and the first and last lines are not counted in the main scores. The most widely used indices describe concentration performance, work pace or processing speed, and accuracy expressed as the percentage of errors. Interpretation is based on comparison with age norms, also examining the speed-accuracy profile and the consistency of performance from one line to the next.
Usage
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