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HALLUCINATION, med. jur. It is a species of mania, by which "an idea reproduced by the memory is associated and embodied by the imagination." This state of mind is sometimes called delusion or waking dreams.
     2. An attempt has been made to distinguish hallucinations from illusions; the former are said to be dependent on the state of the intellectual organs and, the latter, on that of those of sense. Ray, Med. Jur. Sec. 99; 1 Beck, med. Jur. 538, note. An instance is given of a temporary hallucination in the celebrated Ben Johnson, the poet. He told a friend of his that he had spent many a night in looking at his great toe, about which he had seen Turks and Tartars, Romans and Carthagenians, fight, in his imagination. 1 Coll. on Lun. 34. If, instead of being temporary, this affection of his mind had been permanent, he would doubtless have been considered insane. See, on the subject of spectral illusions, Hibbert, Alderson and Farrar's Essays; Scott on Demonology, &c.; Bostock's Physiology, vol. 3, p. 91, 161; 1 Esquirol, Maladies Mentales, 159.

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This means there's something about childhood trauma that leads some people to develop hallucinations," Dr Bendall said.
The team identified a cluster of five genes psychedelic mushrooms have in common after examining three species of magic mushrooms and several related fungi species that don't cause hallucinations.
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El-Bouhaddani then broke psychotic experiences down into hallucinations and delusions, and examined their relationships to symptom course.
The study is the first large-scale randomized controlled trial of this type of therapy, and was used in people with schizophrenia who had had persistent and distressing auditory hallucinations for more than a year, despite treatment.
Its most common symptoms are delusions and auditory hallucinations.
Hallucinations may be caused by a range of neurological conditions, such as Parkinson's disease and dementia with Lewy bodies.
I believe he needs professional psychiatric help to treat his hallucinations.
Objective: To investigate the efficacy and safety of tDCS for auditory hallucinations among patients with schizophrenia.
In a univariate analysis, only hallucinations posted a significant association with discontinuation of risperidone.
Hallucinations are sensory experiences not associated with actual sensory stimuli and are not limited to patients experiencing symptoms of schizophrenia.
Auditory verbal hallucinations (AVHs) are among the core symptoms used in the diagnosis of schizophrenia, occurring in 60–80% of schizophrenia patients.