The effect of Parkinson's disease on interference control during action selection

Area of Science:

• Neuroscience
• Cognitive Psychology
• Neurology

Background:

• Basal ganglia are crucial for response selection and suppression.
• Parkinson's disease (PD) may impair this function, affecting response inhibition.
• Inter-individual variability in PD complicates understanding of response suppression deficits.

Purpose of the Study:

• To investigate response suppression deficits in Parkinson's disease.
• To examine the impact of conflicting stimuli on response selection in PD patients.
• To resolve controversy regarding response suppression dysfunction in PD.

Main Methods:

• Utilized an arrow version of the Eriksen flanker task.
• Assessed performance of 50 PD patients and 25 healthy controls.
• Employed distributional analyses guided by dual-process models and activation-suppression hypothesis.

Main Results:

• PD patients exhibited a greater cost of incongruence compared to controls.
• Distributional analyses revealed reduced efficiency in suppressing conflicting responses among PD patients.
• This suppression deficit was observed in approximately half of the PD patient cohort.

Conclusions:

• Reduced efficiency in suppressing conflicting responses is a significant feature in some PD patients.
• The findings highlight the role of basal ganglia dysfunction in response suppression.
• Not all medicated PD patients demonstrate impaired response suppression.