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Danilo Benozzo gives a presentation to MEG Laboratory, CIMeC
At the MEG lab meeting, Danilo Benozzo gives a presentation entitled "Imaginary part of coherency as a measure of functional connectivity".
Abstract: Coherency is commonly used as a measure of functional brain connectivity in EEG/MEG analysis. As it is a complex number, particular attention is payed to its absolute value (coherence) and phase. However, Nolte et al (2004), provided a reasonable interpretation of the Cartesian representation form, focusing in particular on the imaginary part of coherency. Authors demonstrated that the imaginary part of coherency is only related to delayed interactions and is not negatively affected by the volume conduction artifact. Finally, the sign of the imaginary part of coherency provides information about the direction of interactions across channels.
Nolte G. et al. Identifying true brain interaction from EEG data using the imaginary part of coherency. Clinical Neurophysiology 2004 Oct;115(10):2292-307.