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Subject of the scale: Impairment: prehension

Arm Motor Ability Test (AMAT)


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AMAT was developed in 1988 by McCulloch [1] to measure the qualitative and quantitative aspects of a range of activities of daily living (ADL) in stroke patients receiving rehabilitation by induced constraint.

It was created to supplement the WMFT, which has the advantage of being quantitative and measuring performance variables of time and strength, but is not linked to improvements in ADL.

Initially composed of 17 items [1], it was later reduced to 13 [2] and 9 items [3] to facilitate its use in clinical practice.

Each task is divided into 1-3 sub-tasks or movements, and the elements of each task may involve different contributions of the two arms, or the distal and proximal part of the paretic arm.
The various components of each task are timed individually, but each task is performed fluidly, continuously. Patients are not aware of the division of tasks.

2 scales relevant to motor recovery are used: the functional or FA Ability (ability to perform the task) and the quality of movement or QoM (how the task is performed).

Scores range from 0 to 5 (5 : the movement is normal). Example: the "cutting meat" task is divided into: take the knife and fork, then cut the meat and finally put the fork in the mouth.

The instructions for each task are first read and then the evaluator performs the task three times, using the same arm as the paretic side of the patient. The patient then performs the task without any possible training.
Each task is limited to 60 or 120 seconds (arbitrarily).

The median is calculated for all the time taken, and the average scores for FA and Qom.

The AMAT does not require specialized hardware but is quite long to perform and requires training of evaluators that can last up to 32 hours depending on the study [2].

> Access to the scale is free

Psychometric properties:


Psychometric properties



Face validity


Content validity


Criterion validity

Concurrent validity

[2] [5]

Predictive validity


Construct validity

Convergent validity

[3] [4]

Divergent validity

[3] [4]

Discriminant validity
(sensitivity and distinctiveness)



Intra-rater reliability

[2] [4]

Inter-rater reliability

[1] [2] [3] [4]



Internal consistency (alpha)

[2] [3]


[2] [3]

General comment on reliability:

Inter-judge reproducibility is high [1, 2]. Very good internal consistency. High sensitivity to change [2]. However, validity against criterion (comparison with the Motricity Index Arm Score) is worse than other psychometric properties but satisfactory [2].
Good reliability of the test. Strong correlation with the WMFT, FMA, ARAT and SIS hand function sub -score. The hierarchy of items by difficulty is appropriate, as is the dimensionality of the test. Similar responsiveness to other tests [3].
The scale has been found to have concurrent criterion validity with the upper limb FMA. Both the FA and the QoM parts of the AMAT can distinguish different levels of motor deficit in patients with slight to moderate disability. However, in patients with severe motor disability, they tend to underestimate the motor deficit [5].

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For more details of the scale, the comments or the psychometric properties presented here, please contact Thibaud Honoré :

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