2.7.5. Digit Cancellation Task
The D-CAT assesses attention. The test form consists of 12 rows of 50-digit numbers. Each row contains five random pairs of numbers from 0 to 9. Thus, one number appears five times in each row and its neighbor is determined randomly. The D-CAT consists of three such sheets. Participants were instructed to locate the designated target number and remove each number with a slash mark as quickly and as accurately as possible, until the experimenter gave a stop signal. One minute was given for each trial, so the D-CAT took a total of three minutes. On the second and third trials, the emphasis was on cancelling all indicated target numbers without omission. The main indicator for this test was the number of hits (correct answers); only the number of hits was used in the first trial.