Grammatical Ability Predicts Relative Action Naming Impairment in Primary Progressive Aphasia.
Aaron M Meyer, Sarah F Snider, Shelby A McGowan and 3 others
PMID 33716376WHAT IT FOUND
In people with primary progressive aphasia, poorer grammar was linked to more trouble naming actions than objects.
The link was strongest when word meaning knowledge was also lower. This does not show that verb-focused therapy works.
Key findings
01Grammatical ability and the interaction between grammatical ability and semantic ability were the only significant predictors of relative action naming impairment.
02Grammatical ability predicted relative action naming impairment when semantic ability was lower, but not when semantic ability was higher.
03Semantic ability alone did not predict relative action naming impairment, and grammatical ability and semantic ability were not significantly correlated.
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 only 34 people with PPA, so the findings are based on a small group. It did not test a treatment, so it cannot show that verb-focused therapy helps. The action naming and object naming items were not matched on word frequency or length, so the comparison depends on normative scores. The paper did not examine verb transitivity effects, because most verbs were transitive.
The easy way to misread this
Do not treat this as proof that verb-focused therapy improves naming. The study measured an association between grammar, word meaning knowledge, and naming scores. It did not test treatment.