Predictors of Spelling and Reading Performance in Logopenic Variant Primary Progressive Aphasia

Area of Science:

• Neurolinguistics
• Cognitive Neuroscience
• Speech and Language Pathology

Background:

• Logopenic variant primary progressive aphasia (lvPPA) is characterized by progressive language decline.
• Understanding written language deficits in lvPPA is crucial for diagnosis and intervention.
• Previous research has not fully elucidated the specific linguistic and psycholinguistic factors influencing spelling and reading in lvPPA.

Purpose of the Study:

• To characterize spelling and oral reading errors in individuals with lvPPA.
• To examine the contribution of phonological, semantic, and transcoding skills to written language performance.
• To explore how psycholinguistic properties affect spelling and reading accuracy in lvPPA.

Main Methods:

• Assessed spelling and oral reading in 22 individuals with lvPPA and 21 controls.
• Utilized multiple linear regression to link linguistic skills (phonology, semantics, transcoding) to written tasks.
• Employed stepwise linear regression to analyze the impact of psycholinguistic properties (e.g., frequency, imageability) on accuracy.

Main Results:

• Phonology-orthography transcoding skills predicted pseudoword spelling.
• Spelling of regular and irregular words was influenced by semantic and phonological abilities, and transcoding.
• Psycholinguistic properties like semantic neighborhood density, frequency, and imageability significantly predicted spelling and reading accuracy.

Conclusions:

• Written language performance in lvPPA is differentially influenced by phonological and semantic abilities.
• Transcoding skills are vital for spelling, particularly for non-words.
• Psycholinguistic properties of words play a significant role in written language accuracy for individuals with lvPPA.