Gazzaniga gives a simple demonstration of why consciousness is a post-hoc story. Touch your finger to your nose and you will experience the sensation of touch simultaneously on the nose and the finger. Yet the neural perceptions must have arrived at the brain at different times: as the neuronal impulse propagates, the fingers are three feet away, the nose just three inches away from the brain. The brain waits for both signals to arrive and integrates them into a single experience before delivering them into consciousness.
