Friday, 22 January 2021

The Clock Drawing Test

 The Clock Drawing Test

The clock drawing test is one of the most popular and quickly applicable neuropsychiatric test that we use to detect dementia in patients with suggestive signs of dementia. The application of the clock drawing test utilises the following cognitive abilities of the patient:
  1. Verbal comprehension
  2. Working memory
  3. Spatially coded knowledge
  4. Constructive skills
  5. Planning, which is one of the executive function functions

The clock drawing test DOES NOT test orientation to time.

Scoring and Administration 

there are as many as 15 ways
to administer and score

Hand over a piece of paper and a pencil

And ask to draw a clock

In which time should be 10 past 11

Watson’s Scoring Method 

A 7-score method 

good reliability. 

Scoring is based on 

The number of digits 

In each of the qudrants

Of the clock

3-digits in a quadrant 

is correct ­čí¬No score is given.

A score of 1 

for an error 

in the first 3-quadrants each;

And 4 for an error 

In the fourth quadrant 

maximum error score >

Normal range> 0-3

Above four:

Sensitivity 87%, 

 Specificity 82% 

­čí¬for dementia 

Simplest scoring method:

One point if completed correctly 

Zero if not correctly.

High correlation 

with MMSE 

and other cognitive tests 

also  used: 

To test

  • Hemineglect and inattention. 

People with 

  • low education

  • advanced age 

  • and depression 

perform poorly

Normal clock 

excludes cognitive impairment

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