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Single-Trial Evoked Potentials: Wavelet Denoising

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Imaging Brain Function With EEG

Abstract

Evoked potentials are typically very small in comparison with the ongoing electroencephalogram and, consequently, they are hardly visible in the individual trials. As discussed in Sect. 1.6, to improve the visualization of the evoked responses, it is a common practice to average several presentations of the same stimulus. Then, the ongoing EEG activity cancels out and the amplitude of the evoked potentials relative to the background EEG increases proportional to the square root of the number of trials. From the average responses, it is possible to identify evoked components, whose amplitudes, latencies, and topographies have been correlated with different sensory and cognitive functions (Regan 1989; Niedermeyer and Lopes da Silva 1993; Quian Quiroga 2006).

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Notes

  1. 1.

    A simple implementation of the method in Matlab as well as tutorials, help files, and sample data sets can be obtained from www.le.ac.uk/neuroengineering.

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Authors and Affiliations

  1. Molecular and Cell Biology, University of California at Berkeley, Berkeley, CA, USA

    Walter J. Freeman

  2. Centre for Systems Neuroscience, University of Leicester, Leicester, UK

    Rodrigo Quian Quiroga

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  1. Walter J. Freeman
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  2. Rodrigo Quian Quiroga
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Freeman, W.J., Quiroga, R.Q. (2013). Single-Trial Evoked Potentials: Wavelet Denoising. In: Imaging Brain Function With EEG. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-4984-3_5

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