RESEARCH PAPER ANALYSIS
Eyeblink conditioning is preserved in Parkinson's disease with tremor.
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ABSTRACT
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OBJECTIVES: This study aims to investigate the potential role of cerebellar dysfunction in the pathogenesis of tremor in Parkinson's Disease. METHODS: We investigated cerebellar function in patients with PD by the classical eyeblink conditioning (EBCC) paradigm, a well-established test of associative learning that depends on the integrity of the cerebellum and the olivo-cerebellar circuit. Patients with tremor (PD-T, n = 16) and patients without tremor (PD-NT, n = 14) were compared to age-matched healthy controls (n = 15). RESULTS: Our findings show no differences in EBCC in PD with and without tremor compared to healthy controls. The eye blinking was reduced in PD patients, and more in those without tremor. CONCLUSION: This study shows a comparable eyeblink conditioning in PD patients with and without tremor, indicating a preserved plasticity and integrity of the cerebellum and the olivo-cerebellar circuit in PD. The cerebellar morphological changes in PD patients with tremor is not associated with an impaired conditioning. SIGNIFICANCE: These findings preclude a contribution of an impaired EBCC in the pathogenesis of rest tremor in PD.
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