The body is a well-oiled machine, generally not
faltering in its steps. The ability to always breathe on time, and make the heart
beat at the right moment, is due largely to the nervous system and the brain.
The nervous system is comprised of neurons that send and receive signals,
resulting in an output, or some sort of response to the stimuli. What happens
if the stimulus being sent is interrupted or altered, due to an exterior influence?
The use of drugs such as LSD is an example of such a case, in which the body responds
to an altered stimulus, resulting in an altered perception. These altered
perceptions are better referred to as hallucinations.