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.
Hallucinations are where someone sees, hears, smells, tastes or feels things that don't exist outside their mind. They're common in people with schizophrenia, and are usually experienced as hearing voices. Hallucinations can be frightening, but there's usually an identifiable cause. For example, they can occur as a result of: taking illegal drugs or alcohol. a mental illness, such as schizophrenia or dementia.