I could never be a biologist - such nasty experiments they have to do!
Anyway, back to the thread. I read that interesting link, the basic thrust of which was that 'psychic energy' was essentially a subjective experience that cannot be measured. I'm not sure all psychics would agree with that. However, let's move on.
Let's assume, for the sake of argument, that spirits are undetectable by scientific instruments, whatever their frequency. They can still, however, communicate with living people (insert 'allegedly' anywhere you like here, I can't be bothered).
So, if thoughts appear in someone's mind from a spirit, that is a definite change to our physical universe. Indeed, more generally, if you think that paranormal experiences originate with something unmeasurable, they nevertheless have measurable effects on the real world. These changes CAN be measured. This is why I reject the argument that science cannot measure the paranormal. At some point there is an interface to the real world - when that happens we can measure it. If these measurements reveal nothing out of the ordinary (normal cause and effect) then we can probably assume there is only a subjective paranormal effect. If, on the other hand, we get effect without cause, it might imply psychic energy.
Anyway, in the current scenario, talking about the frequency of a spirit makes perfect sense. The spirit must produce a physical effect, triggering specific synapses in a particular order and timing to produce a thought that is not simply memory retrieval. So, is there any way to differentiate between 'psychic derived thoughts' and ordinary thoughts and, in particular, various normal brain states where thoughts or memories might appear spontaneously as if from an external source.
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