An interaction of neural and muscle activity - inferred based on the Electroencephalogram (EEG) and Electromyogram (EMG) data - at the tremor frequency is expected, if neural malfunction is the cause of trembling muscles .Second and third order spectral analysis was performed on two types of data. First, data was simulated from a model mimicking the nonlinear properties of the tremor time series. Limitations of linear second order spectral analysis are illustrated in those simulations. Linear spectral analysis is a powerful tool when assessing spectral properties of time series. However, linear techniques fail to reveal nonlinear couplings. In the application of nonlinear spectral analysis to tremor time series. In a simulation study based on a model of coupled sinusoids we show that peaks similar to the ones occurring in tremor data can be higher harmonics. They can be detected by the third order spectral, i.e., bispectral, analysis.
A journal is a periodical publication intended to further progress of science, usually by reporting new research. Most journals are highly specialized, although some of the oldest journals publish articles, reviews, editorials, short communications, letters, and scientific papers across a wide range of scientific fields. Journals contain articles that peer reviewed, in an attempt to ensure that articles meet the journal's standards of quality, and scientific validity. Each such journal article becomes part of the permanent scientific record.
Last date updated on January, 2021