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Chemical Senses, Vol 23, 531-539, Copyright © 1998 by Oxford University Press

ARTICLES

Action potential classifiers: a functional comparison of template matching, principal components analysis and an artificial neural network

JP Stitt, RP Gaumond, JL Frazier and FE Hanson
Department of Entomology, Pennsylvania State University, University Park, PA 16802, USA. jps120@psu.edu

Multiunit neural activity occurs often in electrophysiological studies when utilizing extracellular electrodes. In order to estimate the activity of the individual neurons each action potential in the recording must be classified to its neuron of origin. This paper compares the accuracy of two traditional methods of action potential classification--template matching and principal components--against the performance of an artificial neural network (ANN). Both traditional methods use averages of action potential shapes to form their corresponding classifiers while the artificial neural network 'learns' a nonlinear relationship between a set of prototype action potentials and assigned classes. The set of prototypic action potentials and the assigned classes is termed the training set. The training set contained action potentials from each class which exhibited the full range of amplitude variability. The ANN provided better classification results and was more robust in analysis of across-animal data sets than either of the traditional action potential classification methods.
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