The human brain has remained until now one of the major enigma of modern science. Neurobiology is studying extensively the biochemical reactions within the brain and sees the effect that emotions and thoughts have upon its very complex electrical and bio-chemical machinery. Without one's brain or with a defective one , one would hear nothing, and be plunged in darkness. The light of our material reality, as we perceive it, becomes light only after being decoded by our brain. The most remarkable feature of visual perception is its ability to convert semicontinuous packets of energy information received at the level of the visual receptors of the brain into individual objects and events, all from the same pulses of electricity running along nerve fibers.
Sound operates in the same way.
For touch, pain, and temperature, physical receptors convey stimuli as nerve impulses to a region of the brain called the thalamus that conveys it to region of the cortex called the sensory cortex. Therefore, one would tend to imply that the brain, as the central sensory computer of a human being or an animal, would also be the seat of his thoughts. This, in the experience of Mr. O'Donnell, is not the case. And as we shall see some neurophysiologists are of the same opinion. Although thought seems to arise from the level of the brain, one cannot localize a thought within the brain but only observe electro-biochemical reactions to it.