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Dynamics of SCR, EEG, and ERP activity in an oddball paradigm with short interstimulus intervals

Published online by Cambridge University Press:  01 September 1999

C. L. LIM ,
E. GORDON ,
C. RENNIE ,
J. J. WRIGHT ,
H. BAHRAMALI ,
W. M. LI ,
P. CLOUSTON  and
J. G. L. MORRIS
C. L. LIM
Affiliation:
Department of Neurology, University of Sydney and Westmead Hospital, Sydney, Australia Cognitive Neuroscience Unit, Department of Psychological Medicine, University of Sydney and Westmead Hospital, Sydney, Australia
E. GORDON
Affiliation:
Cognitive Neuroscience Unit, Department of Psychological Medicine, University of Sydney and Westmead Hospital, Sydney, Australia
C. RENNIE
Affiliation:
Department of Medical Physics, University of Sydney and Westmead Hospital, Sydney, Australia
J. J. WRIGHT
Affiliation:
Brain Dynamics Laboratory, Mental Health Research Institute of Victoria, Australia
H. BAHRAMALI
Affiliation:
Cognitive Neuroscience Unit, Department of Psychological Medicine, University of Sydney and Westmead Hospital, Sydney, Australia
W. M. LI
Affiliation:
Cognitive Neuroscience Unit, Department of Psychological Medicine, University of Sydney and Westmead Hospital, Sydney, Australia
P. CLOUSTON
Affiliation:
Department of Neurology, University of Sydney and Westmead Hospital, Sydney, Australia
J. G. L. MORRIS
Affiliation:
Department of Neurology, University of Sydney and Westmead Hospital, Sydney, Australia
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Abstract

Studies of concurrent central, and autonomic activity using a conventional event-related potential (ERP) oddball paradigms, are considered useful in elucidating the relationship between central and autonomic responses, but the autonomic response tends to overlap. A new method was used to decompose and score overlapping skin conductance responses (SCR). This method enabled examination of dynamic relationships of phasic SCR, prestimulus electroencephalogram (EEG), and ERP to auditory target stimuli in 50 normal adults. SCR amplitude was negatively correlated to EEG and N200 amplitude. The SCR amplitude changes over time exhibited an exponential decline opposite to those of N200, alpha, and beta. All the fitted exponential functions had a time constant of 1–2 min. The findings suggest that a N200 component, active in the auditory sensory discrimination, is concomitant with the SCR. The narrow range of the time constant may provide a clue to the conjoint processes underlying central and autonomic adaptive functions.

Keywords

EEGN2bSCRElectrodermal activityOrienting reflexTime constant
Type
Research Article
Information
Psychophysiology , Volume 36 , Issue 5 , September 1999 , pp. 543 - 551
Copyright
© 1999 Society for Psychophysiological Research

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