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A new algorithm for averaging of evoked potentials (EPs) is introduced and compared with the conventional method. The root mean square (rms) values of the alpha and theta band EEG activities 1-s preceding stimulus presentation were computed: stimuli were blocked during phases of high prestimulus activity, thus evoking auditory responses selectively during periods of low activity. Ten volunteers were stimulated with tone bursts of 2000 Hz, 80 dB and 1-s duration. The main results were: (1) The averaged EPs showed an increase in amplitude of nearly 40% in comparison to experiments with conventional stimulation. This increase was in the range of 30% when an ISI correction was taken into account. (2) Single trials tended to form patterns of damped oscillations of e.g., 7-8 Hz, thus revealing a high correlation to the averaged EP. In alpha or theta band contingent experiments, correlation coefficients between single trials and averaged EPs were significantly higher (p < .01; p < .05).
E Rahn, and
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September 1988,
Electroencephalography and clinical neurophysiology,
E Rahn, and
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January 2002,
Zhurnal vysshei nervnoi deiatelnosti imeni I P Pavlova,
E Rahn, and
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December 2000,
Canadian journal of experimental psychology = Revue canadienne de psychologie experimentale,
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March 2017,
Hearing research,
E Rahn, and
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January 1991,
Homeostasis in health and disease : international journal devoted to integrative brain functions and homeostatic systems,
E Rahn, and
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Computational intelligence and neuroscience,
E Rahn, and
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November 1972,
Psychophysiology,
E Rahn, and
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June 2006,
Computers in biology and medicine,
E Rahn, and
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September 1971,
The American journal of psychiatry,
E Rahn, and
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August 1971,
Electroencephalography and clinical neurophysiology,
