PSYC31H3 Lecture Notes - Circumlocution, Semantic Dementia, Vocabulary

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Published on 8 Mar 2013
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Chapter 13: Verbal Functions and Language Skills
Boston Naming Test (BNT)
-consists of 60 large ink drawings of items ranging in familiarity from such common ones as a
“tree” and “pencil” at the beginning of the test to “sphinx” and “trellis”
-discontinued after eight consecutive failures
-for patients with dementia sometimes semantic or phonetic cues are required
-racial difference between blacks and whites
-test results show a slight drop in their late 70’s
-education level is a contributing factor, no sex differences
-naming impairments in aphasic patients, significantly more perseveration errors than patients
with right hemisphere damage
-thalamic lesions can produce naming deficits
-typically naming deficits occur in patients with left hippocampal damage
-progressive aphasia producing naming errors with damage to the temporal lobes
bilaterally
-BNT is also widely used in dementia assessment as a sensitive indicator of both the presence
and the degree of deterioration
-alzheimer’s patients have both lexical retrieval deficits and semantic deficits
Vocabulary (Wechsler)
-the test is continued until the subject fail 5, 6, or 3 times consecutively or until the list has been
completed
-score reflects the extent of recall vocabulary and the effectiveness of speaking vocabulary
-it is often used as a measure of premorbid intelligence
-scores tend to peak in the middle adult years, rising from the early 20s as more knowledge is
acquired
-word-finding difficulties in the elderly can result in circumlocution or vagueness in a response
that reduces a good understanding of a word
-educational effect more pronounced than age effects
-minimal practice effects
-sensitive to lesions in the left hemisphere
-PHI tend to see a deficit in verbal ability and then a slow decline
-CHI tend to remain the same
-holds up relatively well in early Alzheimer’s disease, but sharp deterioration as the disease
progresses
-prominent feature of semantic dementia as words vanish from the vocabulary
-right hemisphere lesions may tend to give verbosely elaborated and circumstantial definitions
Wide Range Achievement Test-4
-Sentence Comprehension
-examinee reads a sentence and then gives one or two words to fill in the blank
-scores correlate moderately with reading comprehension
-Word Reading
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