Clock Drawing Test

The Clock Drawing Test (CDT) is a brief cognitive screening task in which a person is asked to draw a clock face, place the numbers, and set the hands to a specified time (commonly "ten past eleven"). Performance is scored on dimensions such as contour, number placement, and hand position, and impairment is associated with deficits in executive function, visuospatial processing, working memory, and planning. The CDT is widely used as a quick screen for dementia and mild cognitive impairment, often alongside the Mini-Mental State Examination or MoCA. In recent years it has also become a target for AI-assisted assessment, with deep-learning models trained on photographed or digitally-captured clock drawings to support automated dementia screening.