Verbal Semantics and the Left Dorsolateral Anterior Temporal Lobe: A Longitudinal Case of Bilateral Temporal Degeneration.
Jet M J Vonk, Valentina Borghesani, Giovanni Battistella and 7 others
PMID 33012947WHAT IT FOUND
A woman with right-sided brain degeneration initially lost the meaning of faces and places but kept her word knowledge.
This suggests checking non-verbal semantics and social behavior early, even when standard language tests look normal.
Key findings
01The patient had a dissociation between impaired non-verbal semantics and relatively spared verbal language abilities in the early stages of the disease.
02Atrophy was concentrated in the medial parts of the anterior temporal lobes, with relative sparing of the left dorsolateral regions.
03The patient did not meet criteria for semantic variant primary progressive aphasia or behavioral variant frontotemporal dementia at the initial visit.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTsWhat it means for SLPs
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What it does not show
This is a single case report, so findings cannot be generalized to other patients. The patient had high premorbid education (Master's degree), which may have provided cognitive reserve that masked early language deficits. Control data was derived from published studies rather than age-matched local controls, which may affect the accuracy of z-scores. The diagnosis evolved over time, initially not meeting criteria for known syndromes, highlighting the limitations of current diagnostic criteria for this specific atrophy pattern.
Declared interests
The authors declare that they have no competing interests.
The easy way to misread this
Do not assume that normal verbal language test results rule out semantic dementia. This patient had severe non-verbal and person-specific semantic deficits despite preserved word comprehension and naming, which can lead to missed or delayed diagnosis if only standard language batteries are used.