Assessment of verb and sentence processing deficits in stroke-induced aphasia: the Italian version of the Northwestern Assessment of Verbs and Sentences (NAVS-I).
Elena Barbieri, Veronica Alessio, Ester Zanobio and 3 others
PMID 38694546WHAT IT FOUND
The Italian NAVS-I accurately detects verb and sentence deficits in aphasia.
The Verb Naming Test is the only subtest that distinguishes agrammatic from fluent aphasia, with agrammatic speakers struggling more with complex verbs. Non-canonical sentences were difficult for all groups.
Key findings
01The NAVS-I detected language deficits in 26 of 28 participants with aphasia, with the Verb Comprehension Task showing the lowest sensitivity.
02The Verb Naming Test was the only subtest that significantly differentiated agrammatic from fluent aphasia, as agrammatic participants showed specific difficulty with verbs requiring more arguments.
03Sentence production and comprehension were impaired for non-canonical structures in both agrammatic and fluent aphasia, with no significant difference between these two patient groups.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The study included a small sample size (28 participants with aphasia), limiting generalizability. The groups were not matched for age or time post-onset; the agrammatic group was younger and further along in recovery than the fluent group, which could confound comparisons. The test uses a limited number of items per category to keep administration short, which may reduce its depth. The study did not include a gold-standard comparison for the specific diagnosis of agrammatism versus fluent aphasia beyond the clinical classification.
The easy way to misread this
Do not rely on the Verb Comprehension Task to rule out deficits, as it failed to detect impairments in the majority of the aphasia group. Also, do not assume that sentence processing deficits are exclusive to agrammatic aphasia, as fluent patients showed similar difficulties with non-canonical sentences.