They are separate effects, but if you apply PEMF in such a way that you will influence both, by wearing PEMF coils on your head or placing your head on a PEMF mat, for example, then you would expect to see both effects.
But that does not mean that they are necessarily “the same thing”, or that everything in the body is connected, so they are always somehow coupled together. Physiologically, the effects are quite distinct, and I have written about this, posted it on YouTube, and given scientific talks on this basic reality as it relates to PEMF.
The bottom line is: if you are using PEMF in a way that it directly impacts your CNS, you should also consider the potential effects of brainwave entrainment. In this case, it is helpful to select a frequency range that your brain finds to be pleasant, while your tissues respond to the entirely different effects of electro-magnetic induction.
This strategy works well principally because your other tissues do not require a precise frequency to get benefits from PEMF, and therefore you are at liberty to select a frequency range that is beneficial for both effects: brainwave entrainment and PEMF inductive tissue stimulation.
I have written about this in many other locations. And because ICES-PEMF is not really primarily designed to promote sleep, though many people use it for that purpose, it is necessary for each individual to find which brainwave entrainment frequency band works best for them, individually, to enhance sleep. I have watched people argue very strongly that the best wave form for sleep is:
(and a few others)
Who is correct: everyone, and no one. Individuals clearly respond differently, and contrary to much of the published science, this phenomenon is quite diverse among individuals.