I can only speculate at best and that leaves me 2 conclusions. 1. The brain is somehow connected with other realities (of some kind) 2. The brain has far more capacity than we ever imagined (the brain uses real simulation as a part of its natural function).
From another thread:
Consider the following:
There are studies out indicating that such perceptions can be the result of subconscious activity involving the Orientation/Association Area (OAA) of the brain and its effects on the higher processing levels in the frontal lobe.
Decreased blood flow to the OAA can manifest as floating, out of body experiences, religious elation, etc., and a person's emotional state (i.e. deep prayer) can affect the blood flow to the OAA.
An overview paper:
410 error - Gone
Detailed papers:
http://www.andrewnewberg.com/pub.asp
This other thread had to do with perceptions of gods present in ones brain.
Minus the religious overtone this may be what you are experiencing. For you, the psychological triggering mechanism may be a memory, strong emotion, lack of sleep ... just about anything.
What does your doctor say?
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