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).
Voices are the most common type of hallucination in schizophrenia. Many people with the disorder hear voices. The voices may talk to the person about his or her behavior, order the person to do things, or warn the person of danger.
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.