Psycholinguistic Variables and Spelling Accuracy for People with Logopenic Variant Primary Progressive Aphasia: A...

Area of Science:

• Neurology
• Psycholinguistics
• Speech and Language Pathology

Background:

• Logopenic variant primary progressive aphasia (lvPPA) presents diagnostic challenges compared to other PPA variants.
• Nuanced characterization of lvPPA symptoms is crucial for accurate and timely diagnosis.
• Spelling variability in lvPPA may stem from differential susceptibility of neural networks to atrophy and word-specific psycholinguistic features.

Purpose of the Study:

• To investigate the impact of psycholinguistic variables on spelling accuracy in individuals with lvPPA.
• To identify specific word-level features that influence spelling performance in lvPPA.

Main Methods:

• An abbreviated spelling assessment using 40 words from the Arizona Battery of Reading and Spelling (ABRS).
• Analysis of 13 psycholinguistic variables (e.g., regularity, age-of-acquisition, neighborhood density, emotional valence) for each word.
• Multilevel logistic regression modeling to assess the effect of psycholinguistic variables on spelling accuracy, accounting for participant clustering.

Main Results:

• Word regularity (REG), age-of-acquisition (AOA), orthographic neighborhood (ONLD), and emotional valence (VAL) significantly predicted spelling accuracy in lvPPA.
• Regularity had the largest effect: 93% accuracy for regular words vs. 67% for irregular words.
• Lower AOA, denser orthographic neighborhoods (lower ONLD), and higher VAL were associated with increased spelling accuracy.

Conclusions:

• Psycholinguistic properties of words significantly affect spelling accuracy in individuals with lvPPA.
• Spelling assessments are valuable tools for diagnosing PPA.
• Further research is needed to confirm if these spelling effects are unique to lvPPA.