Narrative Discourse Cohesion in Early Stage Parkinson's Disease

Area of Science:

• Neuroscience
• Linguistics
• Clinical Psychology

Background:

• Basal ganglia (BG) models predict expressive language deficits in BG disease, yet empirical data show disparities.
• Traditional language assessments may overlook how language is used, contributing to these discrepancies.

Purpose of the Study:

• To investigate expressive language use in idiopathic Parkinson's disease (PD) by analyzing cohesive markers in narrative discourse.

Main Methods:

• Compared 12 individuals with PD to 12 matched controls on narrative discourse performance.
• Analyzed three discourse samples for narrative productivity, cohesive ties, and cohesive adequacy.
• Utilized mixed model analyses for group comparisons.

Main Results:

• No significant group differences were found in narrative productivity or the number of cohesive ties.
• Individuals with PD exhibited significantly lower cohesive adequacy, producing more incomplete and erroneous cohesive ties.

Conclusions:

• The basal ganglia (BG) may have an executive function in expressive language use, distinct from language form.
• Disruptions in BG function, as seen in PD, can impact the appropriate use of cohesive markers in discourse.