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A Factor Analysis of Visual Evoked Responses
Author(s) -
Street W. Jeanne,
Perry Nathan W.,
Cunningham Walter R.
Publication year - 1976
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.1469-8986.1976.tb03089.x
Subject(s) - psychology , varimax rotation , stimulus (psychology) , scalp , correlation , uncorrelated , audiology , developmental psychology , statistics , cognitive psychology , psychometrics , mathematics , cronbach's alpha , medicine , geometry , anatomy
A factor analysis was performed on 19 visual evoked response (VER) variables and age, in order to identify patterns of relationships among the variables. The analysis resulted in a 7‐factor Varimax solution. Subjects were 98 kindergarten children (50 girls and 48 boys) in upper‐middle socio‐economic class. Mean IQ was 119.5; mean age, 67.16 mo. The five cortical measures of amplitude, latency, correlation, complexity, and linearity, the latter two of which had not been previously measured, were recorded from three scalp locations in response to three types of visual stimulation. Four factors (amplitude, linearity, and two latency factors‐one for each of two stimulus conditions) were obtained which showed significant loadings only within a given cortical measure. Three factors (one for each of the stimulus conditions) were obtained which showed significant loadings across different cortical measures. Examination of the correlation matrix, as well as the orthogonal (independent) factor solution, supported the main hypothesis that the VER is a multidimensional domain. Specifically, different stimulus conditions and/or different cortical measures of VER often produced variables which were uncorrelated across subjects.