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Dysfluency in primary progressive aphasia: Temporal speech parameters.

Lorraine Baqué¹, María-Jesús Machuca²

¹Departament de Filologia Francesa i Romànica, Universitat Autònoma de Barcelona, Bellaterra, Spain.

Clinical Linguistics & Phonetics

|August 6, 2024

Summary

Analyzing speech fluency in Primary Progressive Aphasia (PPA) reveals distinct temporal patterns for each variant. Temporal speech parameters, beyond pausing, are crucial for understanding PPA dysfluency.

Keywords:

Primary progressive aphasia fluency speech speech chunks temporal parameters

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Area of Science:

Neurology
Speech-Language Pathology

Background:

Primary Progressive Aphasia (PPA) diagnosis can be challenging.
Dysfluency in PPA is often characterized by abnormal pausing, with limited focus on temporal speech features.

Purpose of the Study:

To compare speech-related fluency parameters across the three main variants of PPA (logopenic, non-fluent, semantic) and healthy controls.
To investigate the utility of temporal speech parameters in characterizing and differentiating PPA subtypes.

Main Methods:

A picture description task was used to assess spontaneous speech in 43 adults (13 lvPPA, 10 nfvPPA, 9 svPPA, 11 controls).
42 speech fluency parameters were computed, including syllable duration, speaking pace, interpausal unit (IPU) duration, and linguistic units per IPU/second.

Main Results:

Each PPA variant demonstrated unique abnormal speech characteristics, indicating diverse underlying deficits.
37 out of 42 parameters were useful for characterizing PPA dysfluency, and 35 for distinguishing between variants.
No single parameter could differentiate between PPA groups, highlighting the multidimensional nature of dysfluency.

Conclusions:

Temporal speech parameters, in addition to pausing, offer a comprehensive understanding of PPA dysfluency.
Multiparametric analysis is essential for accurately characterizing and differentiating PPA subtypes due to the complexity of dysfluency.