18 to 89 years
The CTT uses numbered coloured circles and universal sign language symbols. The circles are printed with vivid pink or yellow backgrounds that are perceptible to colourblind individuals. For the Colour Trails 1 trial, the respondent uses a pencil to rapidly connect circles numbered 1 through 25 in sequence. For the Colour Trails 2 trial, the respondent rapidly connects numbered circles in sequence, but alternates between pink and yellow colours.
Administration and scoring may be accomplished by individuals without formal training in psychology. Interpretation of CTT scores in patient care settings requires professional training in clinical psychology, school psychology, neuropsychology, or related fields. Form A is the standard test form on which normative data were collected. Therefore, Form A is the only form that should be used for clinical evaluation. Forms B, C, and D of the CTT are considered experimental versions at this time, and should be used only in research settings.
Note: Stopwatch is required for administration.
Approximately 3-8 minutes (timed)