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Updated: Jun 14, 2026

New Framework for Understanding Cross-Brain Coherence in Functional Near-Infrared Spectroscopy (fNIRS) Hyperscanning Studies
Published on: October 6, 2023
Interaural coherence for noise bands: waveforms and envelopes
Neil L Aaronson1, William M Hartmann
1Department of Physics and Astronomy, Biomedical and Physical Sciences Building, Michigan State University, East Lansing, Michigan 48824, USA. neil.aaronson@stockton.edu
Abstract:
This paper reports the results of experiments performed in an effort to find a formulaic relationship between the interaural waveform coherence of a band of noise gamma(W) and the interaural envelope coherence of the noise band gamma(E). An interdependence described by gamma(E)=pi/4+(1-pi/4)(gamma(W))(2.1) is found. This relationship holds true both in a computer experiment and for binaural measurements made in two rooms using a KEMAR manikin. Room measurements are used to derive a measure of reliability for the formula. Ultimately, a user who knows the waveform coherence can predict the envelope coherence with a small degree of uncertainty.
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