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After the task is complete, the test administrator draws a clock with the hands set at the same specific time. Then the patient is asked to copy the image. [37] Errors in clock drawing are classified according to the following categories: omissions, perseverations, rotations, misplacements, distortions, substitutions and additions. [35]
In this clock drawing task, the subject is asked to draw a clock with the hours and showing the time 2:30. Successive results show a deterioration of pattern processing ability in a subject as they progress from mild cognitive impairment (MCI) to severe Alzheimer's disease (AD). The MoCA assesses several cognitive domains:
Visuospatial abilities are assessed using a clock-drawing task (3 points) and a three-dimensional cube copy (1 point). Multiple aspects of executive functions are assessed using an alternation task adapted from the trail-making B task (1 point), a phonemic fluency task (1 point), and a two-item verbal abstraction task (2 points).
Constructional disabilities are often tested by asking the patient to draw a 2D model or assemble an object. Some researchers feel that neuronal mechanisms involved in drawing and copying differ, thus they should be tested individually. Free drawing is a commonly used test in which the patient is asked to draw a named object.
His Go/no-go task, which was one of the tasks screening for the frontal lobe damage, "count by 7", hands-clutching, clock-drawing task, drawing of repeatitive patterns, word associations and categories recall and others became standard components of neuropsychological assessment and mental status screening.
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It comprises tests of attention, memory (7-item name and address), letter fluency, clock drawing, and memory recall, and takes under five minutes to administer. The M-ACE is scored out of 30, with a higher score indicating better cognitive function, and has two recommended cut-off scores (25 and 21). The higher cut-off score has both high ...