This study develops and conduct a small-scale clinical trial study in which the linguistic and cultural diversity of the participants is considered. Speech therapy and counseling services are provided to both patients with Parkinson's disease and their caregivers.

Attention has been increasingly paid to the "culturally and linguistically diverse (CLD)" communities which typically include dialectal users of English, monolingual and multilingual speakers of minority languages, and bilingual speakers of English and a minority language. However, among these, monolingual speakers of minority languages living in the US have been nearly excluded from dysarthria management. Most of these are first-generation immigrants who are well documented to have limited access to financial and medical services and have poorer health outcomes including communication difficulties. This creates critical health disparities in the field of communication rehabilitation.

This study will (1) examine effects of speech therapy on PD patients' speech acoustics and intelligibility, (2) examine effects of the intervention program on communication participation and well-being of both PD patients and their families. Our primary outcome measures, speech intelligibility and acoustic measures, are hypothesized to show improvements. Acoustic predictors of speech intelligibility are expected to include acoustic vowel space and voice onset time. These hypotheses are based on literature reporting (1) positive changes in speech function after intensive treatment programs focusing on vocal effort and hyperarticulation and (2) language-specific contributors to speech intelligibility in PD. Our secondary outcome measures include (1) communication participation and (2) well-being measures which will be obtained from both PD patients and family members. Based on previous research, the measures are hypothesized to show improved communication participation and well-being in both PD patients and their families following therapy.

Inclusion Criteria:

• Medical diagnosis of PD
• No history of other neurological disease
• Native speaker of Korean
• Age between 25 and 85
• Diagnosis of dysarthria secondary to PD from an SLP
• Self-reported typical hearing
• Access to high-speed internet for therapy sessions

Exclusion Criteria:

• A score of 23 or below on the Korean Montreal Cognitive Assessment
• Evidence of voice-speech disorders not-related to PD
• Received speech therapy for PD-related problems in the past one year
• Have no family members to participate in the project.

Due to the interactive nature of rehabilitation, masking the intervention to patients and research investigators is impossible. Therefore, we will blind the separate outcome assessors, who will not be involved in the treatment procedures to minimize bias.