Nonlinear prediction as a tool for tracking the dynamics of single-trial readiness potentials

Journal of Neuroscience Methods
J Dushanova, D Popivanov

Abstract

The performance of a voluntary act is preceded by an intrinsic process of intention and preparation accompanied by specific patterns of scalp-recorded EEG. The baseline shift to negativity and the decrease of alpha and beta oscillations prior to movement performance are considered to reflect the motor preparation and are observable even in single-trial EEG records during repetitive voluntary movements. The single-trial features of these patterns are of importance since they would reflect the dynamics of EEG activity during movement performance throughout the experimental session. Since this process is very complex and its dynamics is unclear, we applied a more general approach, i.e. the method of nonlinear prediction (NP) recommended for detection of chaos in the behavior of nonlinear dynamical systems. The NP is based on a library of past patterns of the time series used to compute the prediction of future pattern. If the time series is chaotic, the correlation coefficient between predicted and actual values would decrease as a function of the prediction step. The NP was applied to EEG records containing readiness potentials (RPs) at Fz, Cz, Pz, C3 and C4 during repetitive voluntary finger flexion. Because of nonstationarity, ...Continue Reading

References

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Citations

Jul 29, 1998·Electroencephalography and Clinical Neurophysiology·L C LiuH W Müller-Gärtner
Jul 31, 1998·Neuroscience Letters·S MicheloyannisE Papanikolaou
Apr 21, 1998·IEEE Engineering in Medicine and Biology Magazine : the Quarterly Magazine of the Engineering in Medicine & Biology Society·D PopivanovJ Dushanova

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