Final answer:
Auditory, visual, olfactory, and tactile hallucinations are associated with hearing voices, seeing non-existent objects/patterns, smelling non-existent odors, and feeling touch when there is no stimulus, respectively.
Step-by-step explanation:
The types of hallucinations such as auditory, visual, olfactory, and tactile hallucinations are usually associated with different sensory modalities perceived in a distorted fashion or perceiving things that do not exist. Auditory hallucinations involve hearing sounds or voices that are not present, visual hallucinations involve seeing images or patterns that are not actually there, olfactory hallucinations concern smelling odors that have no physical source, and tactile hallucinations refer to the sensation of being touched or feelings on the skin when no external stimulus is present.
These effects can be induced by substances known as hallucinogens, which include both classic hallucinogens like LSD and dissociative drugs like PCP. Hallucinogens cause profound distortions in a person's perceptions of reality by temporarily disrupting communication between neurotransmitter systems in the brain and spinal cord that regulate mood, sensory perception, and other bodily functions.