Journal
INTERNATIONAL JOURNAL OF PSYCHOPHYSIOLOGY
Volume 75, Issue 3, Pages 349-356Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijpsycho.2010.01.005
Keywords
Skin conductance; SCR; Galvanic skin response; GSR; Electrodermal activity; EDA; Convolution; Deconvolution; General linear model; Linear time-invariant filter; Biophysical models
Funding
- Wellcome Trust
- Swiss National Science Foundation
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Analytic tools for psychophysiological signals often make implicit assumptions that are unspecified. In developing a mathematical framework for analysis of skin conductance responses [SCRs], we formalise our assumptions by positing that SCRs can be regarded as the output of a linear time-invariant filter. Here, we provide an empirical test of these assumptions. Our findings indicate that a large component of the variance in SCRs can be explained by one response function per individual. We note that baseline variance (i.e. variance in the absence of evoked responses) is higher than variance that could not be explained by a linear time-invariant model of evoked responses. Furthermore, there was no evidence for nonlinear interactions among evoked responses that depended on their temporal overlap. We develop a canonical response function and show that it can be used for signals from different recording sites. We discuss the implications of these observations for model-based analysis of SCRs. (C) 2010 Elsevier B.V. All rights reserved.
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