Neurons, axons, dendrites, synapses... you remember the terminology of nerve cells from school, maybe. Marjorie Hines Woollacott, emeritus professor at the University of Oregon, knows it forwards and backwards.
As a neuroscientist, she knew the physical entity of the human brain completely. But it wasn't until she began meditating that she began to think beyond the physical constraints of the mind.
She explores the topic in the book Infinite Awareness.