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Published on: July 14, 2016
Pupillary response to cognitive workload during saccadic tasks in Parkinson's disease
M Ranchet1, J Orlosky2, J Morgan3
1Department of Physical Therapy, College of Allied Health Sciences, Augusta University, Augusta, GA, USA; University of Lyon, F-69000 Lyon, France; French Institute of Science and Technology for Transport, Development and Networks (IFSTTAR), TS2, LESCOT, F-69500 Bron, France.
Cognitive workload during eye movement tasks is higher in Parkinson's disease (PD) patients, especially those with cognitive impairment. Pupil recordings reveal increased workload, potentially indicating early cognitive decline in PD.
Area of Science:
- Neuroscience
- Ophthalmology
- Cognitive Science
Background:
- The relationship between cognitive workload and cognitive impairments in Parkinson's disease (PD) is not well understood.
- Saccadic tasks are sensitive to cognitive function and can be used to assess neurological conditions.
Purpose of the Study:
- To compare cognitive workload during saccadic tasks between controls, PD patients without cognitive impairment (PD-NCI), and PD patients with cognitive impairment (PD-CI).
- To investigate the utility of pupil recording for measuring cognitive workload in different PD cognitive states.
Main Methods:
- 16 controls, 11 PD-NCI (MOCA≥26), and 10 PD-CI (MOCA<26) patients performed prosaccade and antisaccade tasks.
- Cognitive workload was assessed using pupil recordings during task performance.
- Eye metrics, including cognitive workload, were compared across the three groups.
Main Results:
- PD-NCI patients demonstrated higher cognitive workload than controls during the prosaccade task.
- PD-CI patients exhibited significantly greater cognitive workload than both PD-NCI patients and controls in the prosaccade task.
- No significant differences in other eye metrics were observed between the groups.
Conclusions:
- Cognitive workload, measured via pupil dynamics, can differentiate between varying cognitive statuses in Parkinson's disease.
- Increased cognitive workload in PD-NCI patients warrants further investigation into its causal role in cognitive decline.
- Pupil-based cognitive workload assessment offers a potential biomarker for cognitive changes in PD.
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