Excited audience members in Australia. Stimulation or sensory excitation is the action of various agents or forms of energy (stimuli) on receptors that generate impulses that travel through nerves to the brain (afferents).
Auditory Hallucinations. Theses auditory, or aural, hallucinations are the most common type of schizophrenia hallucination. They are a disruption of the normal hearing process, involving hearing annoyances such as clicks, hums, or screeches, and can be as complex as hearing complete voices.
Keep in mind that a person with dementia is trying to make sense of his or her world with declining cognitive function. A delusion is not the same thing as a hallucination. While delusions involve false beliefs, hallucinations are false perceptions of objects or events that are sensory in nature.