Objective: The objective is to define the relationship between increase in beta oscillatory changes with practice and retention of motor skills in normal healthy subject and in patients with Parkinson’s Disease (Moisello et al., 2015).

Background: Recently we found that modulation depth of beta power during movement increases with practice over sensorimotor areas in normal subjects but not in patients with Parkinson’s disease (PD). As such changes might reflect use-dependent modifications, we concluded that reduction of beta enhancement in PD represents saturation of cortical plasticity. A few questions remained open: What is the relation between these EEG changes and retention of motor skills? Would a second task exposure restore beta modulation enhancement in PD? Do practice-induced increases of beta modulation occur within each block? 

Methods: We thus recorded high density EEG (256 electrodes) in patients with PD and age-matched controls in two consecutive days during a forty-minute reaching task divided in fifteen blocks of 56 movements each. 

Results: The results confirmed that, with practice, beta modulation depth over the contralateral sensorimotor area significantly increased across blocks in controls but not in PD, while performance improved in both groups without significant correlations between behavioral and EEG data. The same changes were seen the following day in both groups. Also, beta modulation increased within each block with similar values in both groups and such increases were partially transferred to the successive block in controls, but not in PD. Retention of performance improvement was present in the controls but not in the patients and correlated with the increase in day 1 modulation depth. 

Conclusions: We conclude that the lack of practice-related increase beta modulation in PD is likely due to deficient mechanisms of potentiation that permit between-block saving of beta power enhancement and trigger mechanisms of memory formation. 

References: Moisello C, Blanco D, Lin J, Panday P, Kelly SP, Quartarone A, et al. Practice changes beta power at rest and its modulation during movement in healthy subjects but not in patients with Parkinson’s disease. Brain Behav 2015b; 5(10): e00374.

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MDS Abstracts - https://www.mdsabstracts.org/abstract/beta-oscillatory-changes-during-practice-and-retention-of-motor-skills-in-healthy-subjects-and-patients-with-pd/