A sensory perception that does not result from a external stimulus. It can occur in any of the sense; hearing, taste, smell, touch or sight.

The apparent, often strong subjective perception of an object or event when no such stimulus or situation is present; may be visual, auditory, olfactory, gustatory, or tactile. Perceptions that occur in the absence of external stimuli and while an individual is awake. Hallucinations may occur with high-dose administration of certain medications or the abuse of particular drugs (hallucinogens) that cause increased stimulation or excitation of the central nervous system. They may also be caused by chronic alcohol abuse; sensory deprivation; certain types of seizures due to impairment or damage of a limited area of the brain (e.g., temporal lobe epilepsy); psychotic illnesses characterized by disturbances in thought, behavior, and emotional reactions (schizophrenia); or certain organic disorders, such as Huntington's disease.

sensory perceptions that are unrelated to the external world and are entirely false!-- google_ad_client = "pub-2371764724899146"; google_alternate_ad_url = "http://www.themcfox.com/multiple-sclerosis/ms-drugs/glossary/alternate1-250_250.htm"; google_ad_width = 250; google_ad_height = 250; google_ad_format = "250x250_as"; google_ad_channel =""; google_color_border = "FFFFFF"; google_color_bg = "FFFFFF"; google_color_link = "0000FF"; google_color_url = "9999AA"; google_color_text = "000080";

a perceptual "error" the results in a person believing they see, hear, or feel something which is not there

Seeing, hearing, feeling or smelling things that are not there.

Hallucinations are experiences of sensations that have no source. Some examples of hallucinations include hearing nonexistent voices, seeing nonexistent things, and experiencing burning or pain sensations with no physical cause.

Perceptions of something (such as a visual image or a sound) that does not really exist. Hallucinations usually arise from a disorder of the nervous system or in response to drugs (such as LSD).

Perceived experiences that occur in the absence of actual sensory stimulation.

Perceptions the person believes to be real despite evidence to the contrary, e.g., the person perceives something that does not exist. Seen in psychosis or acutely induced by such factors as drugs, alcohol, and stress. They may involve any of the five senses, but auditory and visual are the most common.

A false sensory message in the brain where the patient perceives a sensory stimulus that does not exist. Auditory, visual, tactile (touch), olfactory (smell), visceral (internal sensation) hallucinations are possible.

seeing, smelling, or hearing things that are not real or true.

Distortions of perception that occur in any of the senses, although auditory hallucinations (hearing voices separate from your own thoughts) are the most prevalent.

They are disorders of perception or a perception without a stimulus.There are various different types of hallucinations including; auditory (hearing sounds or voices), olfactory (smells), tactile (sensation), visual (seeing things) or gustatory (taste).The most common are hearing voices or seeing things that don't really exist. Hallucinations are common psychotic disorders. Hallucinations may also occur after illegal drug use and some prescribed drugs (e.g. steroids).

Perception of objects, sounds, or sensations with no reality.

a strong perception of an event or object when no such situation is present; may occur in any of the senses (i.e., visual, auditory, gustatory, olfactory, or tactile).

Hallucinations are usually, but not always, visual and often are more pronounced when the person is most confused. They are not necessarily frightening to the person. Other modalities of hallucinations include sound, taste, smell, and touch.

The false perception of a sight, sound, taste, smell or touch when no actual stimulus is present. Hallucination also refers to the imaginary object apparently seen and heard.

False perception of objects, e.g. seeing a fly that doesn't exist

A sensory experience where a person sees, hears, or feels something or someone that is not audible or visible to anyone else.

Unusual perceptions, for example, hearing sounds or voices that are not there.