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.
Partial epilepsy is also a cause of episodic complex visual hallucinations 2. Pathological discharges from the visual cortical areas, mainly from posterior parietal and temporal association cortex, may produce brief, recurrent and stereotyped visual hallucinations.