Coherence word11/20/2023 ![]() People who are anxious or stressed or depressed may show these low slow coherence levels. When this coherence does not appear, it suggests that the neurons in the cortex are having difficulty letting go of their working state and shifting into a lower-energy resting-ready state. ![]() ![]() All the non-working neurons who are listening to the specific “radio station” (frequency generator) should all be dancing to the same rhythm. When we look at coherence in alpha or theta in a brain, especially during the eyes closed or eyes-open baseline conditions–not at task–we expect to see it run between about 40-70. It is a measure, like the correlation coefficient, which ranges from 0-1 or (in percentage terms) from 0-100. Faster frequencies, the beta frequencies, are produced in the cortex, generally in local pools of neurons which work together to perform specific functions.Ĭoherence is not measured in Hertz or microvolts. When the cortex, the thinking part of the brain, is working, we expect to see its neurons “de-synchronize” from those rhythm generators, just as you might turn off music you were listening to when you had to focus on a task. Slower frequencies, alpha and lower, are generally produced by rhythm generators in the middle of the brain, below the cortex. Whether coherence is a good thing or a bad thing depends to some extent on what frequency we are talking about and what sites and what task. CoherenceĬoherence is a measure of how effectively two sites are able to link and unlink, to share information. Discussion about coherence and synchrony as they relate to brain function and training.
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