The d2-R online consists of 14 screens of 60 symbols (in 6 rows of 10). Each symbol consists of a ‘d’ or ‘p’ marked with one, two, three or four small dashes. The test taker must scan the lines and cross out all occurrences of the letter ‘d’ with two dashes while ignoring all other symbols. The d2-R…

The d2 Test measures processing speed, rule compliance, and quality of performance, allowing for a neuropsychological estimation of individual attention and concentration performance. Originally developed to measure driving aptitude and efficiency, the d2 Test has become the mainstay of attentional …