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Coherence - What does it measure?
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Posted: 27 Jul, 2007
by: Zirkle E.
Updated: 13 Aug, 2008
by: Collura T.
Attached are some documents on coherence .
 
It is the cross-spectral similarity between the channels, scaled as a percentage.  100 means the signals are identical, in the frequency band of interest.  0 means they are orthogonal, hence totally different.  Even random signals are typically 30 to 40 percent coherent. It is like a Pearson Correlation Coefficient.  It is calculated based on the spectral energy, and is done inside the digital filters.
 
It is basically a measure of how much similarity or communication there is between the two channels.

Physiologically the coherence is proportional to the number of connections and the strength of the connections.
Attached files
file comod_with_src_and_refractory.pdf (334 kb)
file Guide_to_Coherence_Training.doc (24 kb)
file Towards_a_Coherent_View_of_Brain_Connectivity_Revised.pdf (68 kb)
file Demo_Beta_Coherence_Uptraining_with_Dynamic_Thresholding.bmz (3 kb)
file connectivity_references.pdf (19 kb)
file BMrNGCoherence.pdf (38 kb)

Also read
document Coherence Training instructions
document Can I train coherence or spectral correlation like Dr. Kirtley Thornton?
document Can I train comodulation?
document Can I train coherence like the Lexicor?
document Can I do comodulation training like Dr. Barry Sterman?
document coherence uptraining (or downtraining) with the BrainMaster software
document Towards a Coherent View of Brain Connectivity - Journal of Neurotherapy pre-print (now with figures attached)

Others in this Category
document Live Z-Score Training with the ANI Z DLL
document Who can interpret the results of a MINI-Q?
document Z-Score Training basic instructions
document How to use NeuroGuide with Mini-Q or standard EEG records
document BrainMaster NeuroGuide Coherence Comparison
document Coherence Training instructions
document Can I train comodulation?
document Synchrony or couples training with the BrainMaster
document Basic Coherence Training Method
document I am having intermittent signal problems with my MINI-Q
document coherence uptraining (or downtraining) with the BrainMaster software
document Simple method to downtrain hypercoherence
document I'm training beta coherence and I'm getting little or no coherence values
document Towards a Coherent View of Brain Connectivity - Journal of Neurotherapy pre-print (now with figures attached)
document How well do live Z Scores match the NeuroGuide Z Scores?
document What is the most important thing about live Z Score training?
document 19-channel MINI-Q with NeuroGuide 2.4.4 Analysis
document Four Channel Alpha Synchrony Protocol
document Fehmi / Collura paper on Monopolar and Bipolar Training - Journal of Neurotherapy 2007
document Is theta good or bad?
document Will z score training replace the clinician?
document New MINI-Q 2 4-channel Site Charts
document MINI-Q II User's Manual
document MINI-Q Instructional Videos and Information
document Gamma SCC (Spectral Correlation Coefficient) Uptraining Settings File Example
document MINI-Q II Positions and Brain Functions
document New MINI-Q II Position Drawings and Analysis
document Session Wizard changing period (run) length


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