In an electroencephalographic method and system for the quantitative analysis of brain waves, a programmed sequence of stimuli is automatically presented to a subject to evoke averaged evoked responses (AER' s). The AER's are automatically analysed by factor analysis in which each waveshape is reconstituted, as closely as possible, by a set of 'basis waveshapes' (factors) held in memory. The 'factor scores' (contributions of each factor) are @ transformed as a comparison against results from a normal population, and displayed as colour-coded topographic maps of the head.
Electroencephalographic system and method using factor structure of the evoked potentials.