Hallucinogens are drugs that affect a person’s perceptions, sensations, thinking, self- awareness and emotions.
A hallucination is a sensory experience of something that does not exist outside the mind. Seeing, hearing, smelling, tasting or feeling something that isn’t really there. Having distorted sensory perceptions, so that things look, sound, smell, etc. differently than they really are.
One common type of hallucination produced by these drugs is called Synesthesia, which is a sensory perception disorder, in which an input via one sense is perceived by the brain as an input via another sense. In its simplest terms, it is a transposition of senses.
Information on a synthetic hallucinogen known as Europa.