Dual-task Interference Disrupts Parkinson's Gait Across Multiple Cognitive Domains

Area of Science:

• Neuroscience
• Motor Control
• Cognitive Science

Background:

• Gait dysfunction and falls are common in Parkinson's disease (PD).
• Dual-tasking (performing gait and a cognitive task simultaneously) further impairs gait in PD.
• The specific cognitive domains contributing to dual-task gait deficits in PD remain unclear.

Purpose of the Study:

• To systematically evaluate gait performance in individuals with mild-to-moderate Parkinson's disease under various dual-task conditions.
• To determine if dual-task gait deficits in PD are specific to certain executive functions or represent a global decline.
• To investigate the relationship between cognitive task demands and gait parameter changes.

Main Methods:

• Twenty-three individuals with mild-to-moderate Parkinson's disease participated.
• Gait was assessed during single-task and dual-task conditions.
• Cognitive tasks included working memory (n-back), attention/problem-solving (serial-7s), verbal memory (digit recall), semantic memory (COWA), and processing speed (Stroop).

Main Results:

• Individuals with PD exhibited generalized worsening of spatial-temporal gait parameters across all cognitive dual-task conditions.
• Gait velocity decreased significantly (p < 0.01), while stride and stance times increased significantly (p < 0.01).
• The attention and problem-solving task led to the most significant gait decrements; cognitive task performance remained stable.

Conclusions:

• Dual-tasking negatively impacts gait in individuals with Parkinson's disease across various cognitive domains.
• These findings suggest a global deficit in information processing and gait regulation in PD, rather than deficits limited to specific executive functions.
• Interventions targeting global executive function and gait control may be beneficial for PD patients.