Word Picture Verification Performance Reveals Auditory Comprehension Deficits in Primary Progressive Aphasia

Area of Science:

• Neuroscience
• Linguistics
• Psychology

Background:

• Word/picture verification effectively measures lexical-semantic abilities in post-stroke aphasia.
• Auditory comprehension deficits in primary progressive aphasia (PPA) require further investigation.
• Previous studies have not extensively explored word/picture verification in PPA.

Purpose of the Study:

• To assess the sensitivity of spoken word/picture verification and matching tasks in identifying auditory comprehension deficits in PPA.
• To analyze error patterns in PPA subtypes to understand semantic and phonological processing disruptions.
• To compare the diagnostic utility of verification versus matching tasks for single-word auditory comprehension in PPA.

Main Methods:

• Evaluated 108 individuals with PPA (logopenic, nonfluent agrammatic, semantic variants) using spoken word/picture verification and matching tasks.
• Quantified the number of individuals identified as impaired by each task.
• Categorized errors as semantic or phonologic to analyze processing deficits.

Main Results:

• Spoken word/picture verification identified 47% of individuals as impaired, significantly more than the matching task (20%).
• Errors in verification were predominantly semantic, particularly in logopenic and semantic PPA variants for both nouns and verbs.
• Nonfluent agrammatic PPA showed semantic errors for nouns but not verbs.

Conclusions:

• Spoken word/picture verification is a more sensitive tool for detecting single-word auditory comprehension deficits in PPA.
• The semantic error patterns support a distributed model of semantic knowledge, indicating degradation of semantic representations in PPA.
• Findings can help differentiate PPA subtypes and inform treatment strategies for anomia.