Influence of attention alternation on movement-related cortical potentials in healthy individuals and stroke patients.

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Influence of attention alternation on movement-related cortical potentials in healthy individuals and stroke patients.

Clin Neurophysiol. 2017 Jan;128(1):165-175

Authors: Aliakbaryhosseinabadi S, Kostic V, Pavlovic A, Radovanovic S, Nlandu Kamavuako E, Jiang N, Petrini L, Dremstrup K, Farina D, Mrachacz-Kersting N

Abstract
OBJECTIVE: In this study, we analyzed the influence of artificially imposed attention variations using the auditory oddball paradigm on the cortical activity associated to motor preparation/execution.
METHODS: EEG signals from Cz and its surrounding channels were recorded during three sets of ankle dorsiflexion movements. Each set was interspersed with either a complex or a simple auditory oddball task for healthy participants and a complex auditory oddball task for stroke patients.
RESULTS: The amplitude of the movement-related cortical potentials (MRCPs) decreased with the complex oddball paradigm, while MRCP variability increased. Both oddball paradigms increased the detection latency significantly (p<0.05) and the complex paradigm decreased the true positive rate (TPR) (p=0.04). In patients, the negativity of the MRCP decreased while pre-phase variability increased, and the detection latency and accuracy deteriorated with attention diversion.
CONCLUSION: Attention diversion has a significant influence on MRCP features and detection parameters, although these changes were counteracted by the application of the laplacian method.
SIGNIFICANCE: Brain-computer interfaces for neuromodulation that use the MRCP as the control signal are robust to changes in attention. However, attention must be monitored since it plays a key role in plasticity induction. Here we demonstrate that this can be achieved using the single channel Cz.

PMID: 27912170 [PubMed - indexed for MEDLINE]

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