A question regarding coherence

[Guest guest]

A couple of newbie questions from a new trainer. I'm still learning so I

appreciate any help with these questions.

My assessment and subsequent brain training using multiband coherence up and

down shows high, beta and high beta coherence at F3 and F4, and Low coherence in

the delta to alpha band along the midline (fz to Pz). What sort of changes

should I expect when training these sites down and up?

I've read many references that muscle artifact is notorious for interfering with

coherence reading. Does that apply to both high and low coherence? I am very

careful to be as relaxed as possible when I train.

Also during a brain training session, how much of a change should I expect to

see after the training is over? Is it common to see the results go the other

way?

For example after training F3F4 multiband coherence down, I noticed after the 15

minutes my coherence didn't change much and perhaps got a little worse. Then

the subsequent session I noticed the coherence had settled to a lower level over

the past 24 hours? Is this similar to a gym session where after working a

muscle you get tired but the bulk of the work occurs during the recovery stage?