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Subcortical Involvement in Formulaic Language: Studies on Bilingual Individuals With Parkinson's Disease
Binna Lee1,2, Diana Van Lancker Sidtis2,3
1Graduate Program in Speech and Language Pathology, Touro College, Brooklyn, NY.
Journal of Speech, Language, and Hearing Research : JSLHR
|November 3, 2020
Summary
Bilinguals with Parkinson's disease (PD) show impaired formulaic language in their native tongue (L1) but not their second language (L2). This suggests basal ganglia dysfunction selectively affects L1 processing in PD patients.
Area of Science:
- Neurolinguistics
- Psycholinguistics
- Cognitive Neuroscience
Background:
- Parkinson's disease (PD) is linked to reduced production of formulaic language in monolinguals.
- Limited understanding exists on formulaic language processing in bilinguals with neurological damage.
Purpose of the Study:
- Investigate formulaic language processing in the first language (L1) and second language (L2) of bilingual individuals with PD.
- Compare L1 and L2 performance between bilinguals with PD and healthy controls.
Main Methods:
- Recruited 11 Korean-English bilinguals with PD (Korean L1, English L2).
- Included two control groups: 11 healthy bilinguals and 11 healthy native English speakers.
- Assessed performance via comprehension, completion, and judgment-correction tasks, alongside conversational speech analysis.
Main Results:
- Bilinguals with PD exhibited impaired L1 formulaic language comprehension and reduced L1 production compared to bilingual controls.
- L2 (English) performance was comparable between bilingual groups with and without PD.
- Both bilingual groups performed worse on L2 tasks than native English speakers, with similar spontaneous L2 production across all groups.
Conclusions:
- Subcortical dysfunction in PD contributes to formulaic language impoverishment.
- Findings indicate a selective impairment of L1 formulaic language in bilinguals with PD, not L2.
- Results support the basal ganglia's role in native language processing.
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