Formulaic Language Resources May Help Overcome Difficulties in Speech-Motor Planning after Stroke

Area of Science:

• Neuroscience
• Speech-Language Pathology
• Neurolinguistics

Background:

• Formulaic expressions engage right-hemisphere networks, aiding stroke patients with left-hemisphere damage.
• Apraxia of speech (AOS) involves word-onset difficulties, impacting communication.
• Previous research highlights the role of formulaic utterances in cerebrovascular disease communication.

Purpose of the Study:

• To investigate if verbal cues from formulaic expressions can alleviate word-onset difficulties in AOS.
• To confirm the efficacy of formulaic cues as a therapeutic strategy for AOS.

Main Methods:

• A cross-sectional study with 20 individuals with chronic post-stroke AOS.
• Participants produced target words preceded by verbal cues varying in formulaicity (stereotyped vs. unstereotyped).
• Cues were matched for phonetic and linguistic features to isolate the effect of formulaicity.

Main Results:

• Significant improvements in correctly produced word onsets were observed after formulaic verbal cues.
• Stereotyped prompts led to greater improvements compared to unstereotyped prompts (p < 0.001).
• Large effect sizes (Cohen's dz ≤ 2.2) indicate a robust treatment effect.

Conclusions:

• Preserved formulaic language skills can effectively reduce word-onset difficulties in AOS.
• Findings support a dynamic interplay between left and right brain networks in post-stroke recovery.
• This approach may offer novel treatment strategies for AOS rehabilitation.