Individuals
with significant brain injury due to trauma, stroke (including subarachnoid
hemorrhage), tumor, or anoxia may demonstrate communication impairment,
particularly during early recovery. Patients with focal left hemisphere
lesions will have marked language impairment acutely and may demonstrate
persistent aphasia (Kertesz & McCabe, 1977; Uzzell et al., 1979).
These impairments complicate early medical and rehabilitation treatment
and have implications for long-term outcome (Tate et al., 1989).
Clinicians are frequently called upon to serially assess communication
skills and language function, provide information to guide medical
and rehabilitation interventions, detect improvement or decline
in clinical status, provide feedback to family, and assist with
post-discharge planning. For patients with severe language impairments,
lengthy language assessment batteries may not be cost-effective
for serial evaluation. A brief instrument that surveys a broad array
of language and communication abilities is more suited to tracking
patients’ progress through their early clinical course.
Individuals
with severe language impairment are challenging to evaluate given
the lengthy nature of comprehensive language batteries and the limited
number of abilities assessed by some brief language tests. In addition,
patients with severe language difficulties may make small improvements
over time that may not be reflected in language battery summary
scores. Common practice involves administering language batteries
or many different tests across multiple sessions to assess patients’
evolving abilities (Brooks et al., 1984; Kertesz, 1982). Performance
differences from one part of the battery to another may reflect
evolution of symptoms between 2 testing sessions. A brief screening
instrument that can be completed within a single therapy session,
bedside evaluation, or clinic appointment would address some of
these possible problems with the use of comprehensive language batteries.
The
MAST was developed in response to the lack of a standardized brief
assessment instrument that could be used with severely neurologically
impaired individuals who were expected to demonstrate impairments
in communication and language functioning. The intent of the MAST
was to briefly and objectively evaluate changes over time for individuals
who could not undergo formal, lengthy language assessments. The
MAST was developed by a team of neuropsychologists, brain injury
physicians, and speech-language pathologists over a two year time
period. Each specialty generated items relevant to the domains important
in the assessment of an acquired language disorder. Items assessing
both expressive and receptive language abilities were created. Items
for 9 language domains were subsequently tested and revised on patients
during acute care hospitalization and inpatient rehabilitation.
The MAST Form I was subsequently evaluated in research; however,
two other alternate forms were created for future research purposes.
The
current MAST Form I has nine subtests: a) Naming, b) Automatic Speech,
c) Repetition, d) Yes/No Accuracy, e) Object Recognition from a
Field of Five, f) Following Verbal Instructions, g) Reading Instructions,
h) Verbal Fluency, and i) Writing/Spelling to Dictation. Forty six
items comprise the MAST. The test takes approximately 5 to 15 minutes
to administer and yields nine subtests and two index scores (Receptive
& Expressive Language Index). Each subscale sums to 10 points
with the exception of the Yes/No Accuracy subscale which sums to
20. The Index scores sum to 50 points each and are added for the
MAST Total Score (0 -100 points).
Figure
1. Description of MAST Form I
The MAST (see Figure 1) items were initially generated, pilot-tested,
and revised to its current form. The MAST-I has nine subscales measuring
the following language domains and yield the following scoring schema.
|
Number
of Items |
Score
Range |
MAST
Total Score |
46 |
0-100 |
|
|
|
Expressive
Language Index |
21 |
0-50 |
Naming |
5 |
0-10 |
Automatic
Speech |
5 |
0-10 |
Repetition |
5 |
0-10 |
Verbal
Fluency |
1 |
0-10 |
Writing
to Dictation |
5 |
0-10 |
|
|
|
Receptive
Language Index |
25 |
0-50 |
Following
Verbal Instructions |
5 |
0-10 |
Following
Written Instructions |
5 |
0-10 |
Object
Recognition from a Field of Five |
5 |
0-10 |
Yes/No
Responding |
10 |
0-20 |
MAST
Instructions for Administration
Administration
instructions are in bold for each subscale.
Now I am going to ask you to do a few things for me.
Subscale Test Instructions
Naming
Tell me what this is called ________(present 1st
stimuli). And this _____ (present 2nd stimuli)…..etc.
Automatic Speech
Can you count to ten for me?
Recite the days of the week.
Now I am going to say something and I want you to finish
it. (present last 3 items)
Repetition
Now say, ______ (present the first word, record
response and proceed with subsequent words).
Yes/No Responses
Now I am going to ask you some questions and I want you
to answer yes or no. (present 10 items).
If patient restates the phrase, repeat the statement and say “Tell
me just yes or no.”
If patient gives a verbal and nonverbal response, score the verbal
response.
If the patient is nonverbal, establish a yes and no gesture and
administer the subtest.
Object Recognition From Field of Five
Place stimuli in scrambled order in front of the patient. The first
two items should be a watch and some keys. The last three items
can include the following: paper, pen, photo (can use the Verbal
Fluency stimulus photos), coin, name badge, or cup. Say, Point
to the _____(present stimuli in order on list).
Following Instructions
Now I am going to ask you to do some things. (issue
verbal instructions).
Reading
Instructions
Now I want you to read this card to yourself and do what
it says. (present 1st card)
Again, read this one to yourself and do what it says
(present 2nd card; keep going until all cards presented).
** An alternative instruction is given for item 3 if the person
is unable to use their right upper extremity to complete the instruction.
An alternative item 3 using the person’s left upper extremity
is available.
Verbal Fluency
I want you to look at this photo for 10 seconds.
(after exactly 10 seconds has elapsed say) Now tell me everything
you can about this picture; keep talking until I tell you to stop.
(Immediately begin timing responses for next 10 seconds. Write all
that the subject says during the 10 second interval onto the recording
sheet. Use a dash for unintelligible utterances.). The 10 second
duration that you record verbalizations begins immediately after
you have finished stating the instructions. Any delay in patient
response is included in the 10 seconds.
Writing
(present a blank piece of paper and pen to the subject)
Now I want you to write some words for me. Write
______(present 1st word), Now write _____(present 2nd word and continue
with last three items)
MAST
Instructions for Scoring
Naming
Subscale
Two points are given for each item named correctly. If patient provides
incorrect response such as a paraphasic error (word substitution),
0 points are given for that item.
Automatic Speech
Two points are given for all items completed correctly. Items 1
and 2 must be completed without error in order to receive credit.
If patient provides incorrect response or partially complete response,
0 points are given for that item.
Repetition
Two points are given for correct restatement of words and phrases.
If the patient provides a word substitution or unintelligible response,
0 points are given for that item.
Yes/No Accuracy
Two points are given for correct answers and 0 points are given
for incorrect responses.
Object Recognition in a Field of Five
Two points are given for each correct identification of an object
named by the examiner.
Following Instructions
Two points are given for each correct execution of a verbal instruction
presented. If any part of the instruction is not completed accurately,
0 points are given for that item.
Reading Instructions
Two points are given for each correct execution of a written instruction
presented. If any part of the instruction is not completed accurately,
0 points are given for that item.
Verbal Fluency
Sum all intelligible words (relevant or irrelevant to the photo
stimulus) given by the patient during the 10 second recording interval.
If the intelligible words sum less than 5, the subscale score is
0. If the intelligible words sum range from 5 to 10, the subscale
score is 5. If the intelligible words sum to greater than 10, the
subscale score is 10. See conversion formula below.
Verbal
Fluency Sum |
Verbal
Fluency Converted Score |
0-4
words |
0 |
5-10
words |
5 |
11
or more words |
10 |
Writing/Spelling
Two points are given for each word correctly written. If there is
an incorrect spelling of any word, a score of 0 is given for that
item.
Optional Ratings
Examiners may indicate presence or absence of several features observed
during the MAST administration including dysarthria, paraphasic
errors, perseveration, and orientation.
|