Revealing Linguistic and Verbal Short-Term and Working Memory Abilities in People with Severe Aphasia.
Wendy Greenspan, Sonia Vieira, Nadine Martin
PMID 39464841WHAT IT FOUND
People with severe aphasia who could not speak showed hidden strengths in word meaning and memory when tested by pointing.
Standard verbal tests missed these abilities. This suggests using nonverbal assessments to find preserved skills rather than assuming a lack of potential.
Key findings
01Seven of the eight participants with severe aphasia scored within one standard deviation of neurotypical controls on at least one nonverbal cognitive-linguistic task, revealing preserved abilities that verbal output did not reflect.
02As a group, participants performed better on tasks involving word meaning than tasks involving sound structure, and they were more accurate when responding immediately rather than after a five-second delay.
03Verbal output did not predict underlying cognitive-linguistic ability; one participant with fluent but empty speech scored the lowest on the assessment, while another with almost no speech scored the highest.
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 eight participants, so the findings cannot be generalised to all people with severe aphasia. The TALSA does not assess syntax or sentence-level processing in detail, focusing mainly on word-level abilities. The study did not examine nonverbal communication skills like gesturing or drawing, which are often key for this population. The comparison to neurotypical controls may not account for all factors influencing performance in severe aphasia.
Declared interests
The authors report no competing interests.
The easy way to misread this
Do not assume that a patient's lack of speech means a lack of understanding or memory. This study found that people who could not speak often had preserved cognitive-linguistic abilities that standard tests missed. Conversely, fluent but empty speech can mask severe underlying deficits.