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Intergroup and Intrasubject Principal Component Analysis of Event‐Related Potentials
Author(s) -
Guthrie Donald
Publication year - 1990
Publication title -
psychophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.661
H-Index - 156
eISSN - 1469-8986
pISSN - 0048-5772
DOI - 10.1111/j.1469-8986.1990.tb02188.x
Subject(s) - psychology , principal component analysis , event (particle physics) , event related potential , cognitive psychology , developmental psychology , cognition , statistics , neuroscience , physics , mathematics , quantum mechanics
The purpose of this paper is to show that the familiar principal component analysis (PCA) of event‐related potentials is identical to an easily formulated least squares method. This correspondence permits interpretation of several criticisms of PCA and clearer presentation of its strengths and shortcomings. Because data analysis based on PCA compares amplitudes of empirically derived components, it is necessary that the shape of the components be similar under the experimental conditions. We present and illustrate a statistical method for comparison of principal components across groups and between conditions within subjects.