EEG analysis has played a key role in the modeling of the brain′s cortical dynamics, but relatively little effort has been devoted to developing EEG as a limited means of communication. If several mental states can be reliably distinguished by recognizing patterns in EEG, then a paralyzed person could communicate to a device such as a wheelchair by composing sequences of these mental states. EEG pattern recognition is a difficult problem and hinges on the success of finding representations of the EEG signals in which the patterns can be distinguished. In this article, we report on a study comparing three EEG representations, the unprocessed signals, a reduced‐dimensional representation using the Karhunen – Loève transform, and a frequency‐based representation. Classification is performed with a two‐layer neural network implemented on a CNAPS server (128 processor, SIMD architecture) by Adaptive Solutions, Inc. Execution time comparisons show over a hundred‐fold speed up over a Sun Sparc 10. The best classification accuracy on untrained samples is 73% using the frequency‐based representation.
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Anderson et al. (1994) studied this question.