Clinical trial NCT05754086: A Multidimensional Study on Articulation Deficits in Parkinsons Disease
Official title: A Multidimensional Study on Articulation Deficits in Parkinson's Disease
Study type: OBSERVATIONAL
Overall status: COMPLETED
Conditions: Parkinson Disease
Dysarthria, Hypokinetic
Lead sponsor: Florida State University
Sponsor class: OTHER
Collaborators: name: National Institute on Deafness and Other Communication Disorders (NIDCD)
First posted: 2023-03-03
Enrollment: 40
Sex: ALL
Minimum age (years): 18
Maximum age (years): 85
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Observational model: CASE_CONTROL
Time perspective: CROSS_SECTIONAL
Sampling method: NON_PROBABILITY_SAMPLE
Study population: All participants will be recruited via convenient sampling from Tallahassee, FL, and the local community. For the neurologically healthy control speakers, flyers will be posted at local coffee shops, community samples, and via word of mouth. For the Parkinson's participants, flyers will be posted at hospitals, health clinics, and gyms.

Brief summary: Articulatory deficits are present in most speakers with dysarthria, which negatively impacts their speech intelligibility, yet little is known about the relationship between articulatory movement and speech intelligibility. This study will examine the relationship between articulation measures, both acoustic and kinematic, and their relationship to perceptual measures (i.e., speech intelligibility and articulation ratings) in 30 individuals with dysarthria secondary to Parkinson's disease and 30 neurologically healthy adults of the same age. The findings will have implications for behavioral management.

Detailed description: Dysarthria is a motor speech disorder that affects individuals with various etiologies. Parkinson's disease (PD) alone affects nearly one million individuals in the U.S., with dysarthria developing in approximately 90% of these individuals within the first two years of onset. The dysarthria associated with PD is characterized by reduced movement, which has been supported by findings of reduced lip, tongue, and jaw movement in speakers with PD. However, it remains unclear if hypokinetic dysarthria causes a global reduction across all articulators, or if specific articulators are disproportionally affected by the disease. Further, it is not fully understood what factors contribute to speech intelligibility. Specifically, little is known about the articulatory-kinematic correlates of speech intelligibility. This missing link is vital to understand, as articulation deficits are a universal characteristic of dysarthria, regardless of etiology. The proposed study provides a linked investigation of kinematic, acoustic, and perceptual characteristics in speakers with PD and neurologically healthy speakers.

This research aims to (1) examine the perceptual, acoustic, and articulator-specific movement deficits in speakers with PD and (2) understand the relationship between articulatory movement and measures of speech perception. Specific Aim 1 will examine the group differences between speakers with PD and neurologically healthy speakers using perceptual, acoustic, and articulator-specific kinematic measures. The investigators hypothesize the perceptual, acoustic, and tongue-related kinematic measures will differentiate individuals with PD from neurologically healthy speakers. Specific Aim 2 will model speech intelligibility (Specific Aim 2a) and ratings of articulatory precision (Specific Aim 2b) using selected acoustic and kinematic measurements. The investigators hypothesize that the acoustic measures will be stronger predictors of speech intelligibility than the kinematic measures, as they are both derived from the speech signal. Further, the investigators hypothesize the selected kinematic measures may demonstrate a stronger relationship to articulation ratings than speech intelligibility. This study is a requisite step toward our long-term goal of advancing dysarthria management strategies. The primary outcome will be explanatory models that identify acoustic and articulatory correlates of speech intelligibility and articulatory precision. This study has important implications for developing articulator-specific dysarthria management strategies to supplement universal dysarthria management strategies.

Eligibility criteria: Inclusion Criteria:

* neurological diagnosis of PD (for the PD group only)
* diagnosis of dysarthria (for the PD group only)
* native English speaker
* no evidence of cognitive impairment, as indicated by a score above 26 on the Montreal Cognitive Assessment
* able to read a paragraph in 19-point font

Exclusion Criteria:

* Not within the age limits

Primary outcomes:
measure: Vowel Space Area
timeFrame: Baseline
measure: F2 Slope
timeFrame: Baseline
measure: Tongue and Jaw Speed
timeFrame: Baseline
measure: Acoustic Distance
timeFrame: Baseline
measure: Tongue and Jaw Distance
timeFrame: Baseline
Secondary outcomes:
Other outcomes:
Locations:
city: Tallahassee
country: United States
facility: Florida State University
state: Florida
Study officials:
affiliation: Florida State University
name: Yunjung Kim, Ph.D.
role: STUDY_CHAIR
References: