Cognitive Function and Executive Control in Parkinson's Disease

Parkinson’s disease (PD) is characterised by progressive dopaminergic neuron loss in the substantia nigra, giving rise not only to motor symptoms but also to impairments in higher-order cognition. Executive control encompasses a suite of processes—including planning, attentional set-shifting, inhibitory control and working memory—that support goal-directed behaviour. These functions rely on cortico-basal ganglia-thalamocortical circuits, particularly connections between the dorsolateral prefrontal cortex and the striatum. Disruption of dopaminergic, cholinergic and other neurotransmitter systems within these networks leads to slowed information processing, reduced mental flexibility and diminished capacity to maintain and manipulate information. Neuroimaging has revealed cortical thinning and altered functional connectivity in frontal and parietal regions, while neurophysiological recordings point to early changes in prefrontal firing patterns. Together, these findings emphasise the need to disentangle motor and cognitive deficits in PD and to develop therapies that preserve executive control alongside motor function.

Research from Nature Portfolio

Advanced robotic paradigms have illuminated the interplay between sensorimotor and cognitive systems in PD. In a task involving a robotic manipulandum with virtual obstacles, patients were required to plan and adjust upper-limb movements under dynamic conditions. Off medication, participants were markedly slower, hit more obstacles and showed less efficient trajectories, reflecting combined motor and executive deficiencies. Surprisingly, following dopaminergic medication, sensory interpretation and cognitive performance worsened under complex scenarios, suggesting that restoration of dopamine may differentially influence distinct neural circuits governing sensory integration and high-order control. This work underscores the complexity of executive dysfunction in PD and advocates for assessment tools that separately probe motor execution and cognitive planning.

Cognitive Function and Executive Control in Parkinson's Disease publication trend

The graph below shows the total number of articles in cognitive function and executive control in parkinson's disease across all publications each year (not limited to Nature Index journals).

Technical terms

Executive control: The cognitive processes that regulate, coordinate and sequence goal-directed behaviour, including working memory, inhibitory control and cognitive flexibility.

Working memory: The capacity to temporarily hold and manipulate information necessary for reasoning and decision-making.

Sensorimotor control: The integration of sensory feedback and motor planning required for precise movement execution.

Cortical atrophy: Loss of cortical tissue volume or thickness, often measured via neuroimaging techniques.

Dorsolateral prefrontal cortex (DLPFC): A key frontal lobe region involved in executive functions such as planning, set-shifting and working memory.

Dopamine replacement therapy (DRT): Pharmacological treatment, typically with levodopa or dopaminergic agonists, aimed at replenishing striatal dopamine levels in PD.

References

1. The effect of dopamine replacement therapy on cortical structure in Parkinson's disease. CNS Neuroscience & Therapeutics (2023).
2. Effects of cholinesterase inhibition on attention and working memory in Lewy body dementias. Brain Communications (2023).
3. Robot-assisted investigation of sensorimotor control in Parkinson's disease. Scientific Reports (2023).
4. Impairment of neuronal activity in the dorsolateral prefrontal cortex occurs early in parkinsonism. Frontiers in Neuroscience (2025).
5. Clinical implications for dopaminergic and functional neuroimage research in cognitive symptoms of Parkinson’s disease. Molecular Medicine (2021).