[Influence of uncorrelated noise sources in parallel signal processing chains on the coherence function (author's...

When linear relationships between bio-electrical signals have to be established, it is important to consider the possible influence of noise added to these signals during recording and processing. Using a model for the signal generation (Fig. 1A) and one for the signal processing (Fig. 1B), the influence of uncorrelated noise in parallel signal processing chains on the coherence function can be quantified (Fig. 2). This is illustrated by the results of electrophysiological experiments, in which field potentials have been recorded simultaneously by two electrodes in different parts of the rat brain.