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Correcting baseline drift artifact in slow potential recording.

A problem frequently encountered by investigators measuring scalp-recorded DC potentials is baseline drift artifact. The sources of baseline drift are many and it is often very difficult to remove drift from the primary data. The problem is particularly acute when long recording epochs are under investigation. The present paper proposes a software solution. A FORTRAN IV computer program defines drift as a significant linear trend in prestimulus voltage on successive experimental trials. When drift is determined to be present, its slope is computed and statistically removed from the data in the poststimulus (response) period. A sample data set is included which demonstrates the method's marked improvement of signal-to-noise ratios, as represented by reduced error variance and improved statistical discrimination between the independent variables of an experiment.