Also found in: Dictionary, Thesaurus, Medical, Legal.



perceptions originating in the absence of a real object in mental illness and some infectious diseases, poisonings, brain traumas, severe emotional shocks, and so on.

To the patients, hallucinations are actual perceptions and not something imagined. Distinctions are made between several types of hallucinations: auditory (voices, calling of one’s name, noises, various kinds of sounds), visual (visions of people, dead persons, animals, insects, monsters, pictures, and events), olfactory (odors of rot, kerosine, perfumes, etc.), and tactile (sensations of insects on the skin, moisture, and blowing), as well as so-called general-sensation hallucinations (some object or animal is present and moving in the abdominal cavity or chest) and extracampal hallucinations (the patient “sees” outside his field of vision a person, persecutor, etc.). Some hallucinations have bright sensory coloration, imagery, and persuasiveness. They are projected outward and may be indistinguishable from real perceptions. Such hallucinations are called genuine. Other hallucinations are perceived by the inner hearing or vision of the patient, are localized in the internal field of consciousness, and are accompanied by a feeling of “accomplishment” and by the influence of some force that causes him to have visions, “loud” thoughts, and so on. These are pseudohallucinations, described at the end of the 19th century by the Russian psychiatrist V. Kh. Kandinskii.

Under the influence of hallucinations which have an imperative, command character, the patient may perform acts that are dangerous to those around him and to his own health and life. Hallucinations are an important and characteristic symptom of many mental illnesses. The pathophysiological nature of hallucinations has not been completely elucidated. Treatment is directed toward eliminating the main disease.


Popov, E. A. Materialy k klinike i patogenezu galliutsinatsii. Kharkov, 1941.
Giliarovskii, V. A. Uchenie o galliutsinatsiiakh. Moscow, 1949.


References in periodicals archive ?
VJRTNsBg) Discover Magazine , the hallucinations had previously taken a toll on her social and professional life.
Around 64% of CBS sufferers don't tell anyone about their visual hallucinations, so Ms Odedra encouraged optometrists to ask their visually impaired patients about any symptoms and provide reassurance about the condition.
The delusions and hallucinations were likely to be paranoid (73% and 47%, respectively).
Joey, 23, who worried he was going mad, said: "I had hallucinations.
And, after being diagnosed with the rare condition, she was able to alter the music in her hallucinations by playing different tunes herself.
Musical hallucinations are a form of auditory hallucinations, in which patients hear songs, instrumental music or tunes, even though no such music is actually playing.
One time I had hallucinations and I've never touched it since.
The study suggests that the disappearance and reemergence of hallucinations in later life are modulated by negative symptoms and community integration, Dr.
Readers may find Hallucinations a bit lacking in [personal stories], since most of the clinical anecdotes here are quite brief.
There are crucial differences between hallucinations (at least in my experience) and God speaking: Hallucinations occur in times of mental stress, drugs or illness that affect the mind; hallucinations are bizarre, otherworldly auditory and visual sensations; hallucinations do not make moral judgments or render valid insights.
Charles Bonnet syndrome (CBS) is characterized by complex visual hallucinations in psychologically normal people with low vision (Shiraishi, Terao, Ibi, Nakamura, & Tawara, 2004) The disorder typically occurs in older adults and in a wide spectrum of ophthalmic diseases, with macular degeneration being the most common.
Phenomenology of delusions and hallucinations in schizophrenia by religious convictions