Sorting of neural spikes: When wavelet based methods outperform principal component analysis

Authors:
Alexey Pavlov;Valeri A. Makarov;Ioulia Makarova;Fivos Panetsos
Affiliations:
Nonlinear Dynamics Laboratory, Department of Physics, Saratov State University, Saratov, Russia 410026;Neuroscience Lab, Department of Applied Mathematics, Escuela de Optica, Universidad Complutense de Madrid, Madrid, Spain 28037;Neuroscience Lab, Department of Applied Mathematics, Escuela de Optica, Universidad Complutense de Madrid, Madrid, Spain 28037 and Departamento Investigacion, Hospital Ramon y Cajal, Madrid, Spain;Neuroscience Lab, Department of Applied Mathematics, Escuela de Optica, Universidad Complutense de Madrid, Madrid, Spain 28037
Venue:
Natural Computing: an international journal
Year:
2007

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Abstract

Sorting of the extracellularly recorded spikes is a basic prerequisite for analysis of the cooperative neural behavior and neural code. Fundamentally the sorting performance is defined by the quality of discriminative features extracted from spike waveforms. Here we discuss two features extraction approaches: principal component analysis (PCA), and wavelet transform (WT). We show that only when properly tuned to the data, the WT technique may outperform PCA. We present a novel method for extraction of spike features based on a combination of PCA and continuous WT. The method automatically tunes its WT part to the data structure making use of knowledge obtained by PCA. We demonstrate the method on simulated and experimental data sets.