News tagged with hallucinations
Bipolar disorder – where patients experience recurrent episodes of mood disturbance, ranging from extreme elation (mania) to severe depression – is thought to affect roughly 2% of the world's population in its most pronounced ...
Psychology & Psychiatry May 09, 2013 | not rated yet | 0
(Medical Xpress)—An anti-hypertension drug administered intravenously for a single four-hour treatment resulted in dramatic improvements of symptoms for people living with schizophrenia, according to newly published findings ...
Psychology & Psychiatry May 09, 2013 | 5 / 5 (3) | 0
(HealthDay)—There has been a dramatic increase in the number of emergency-room visits related to sleep medications such as Ambien, according to a new U.S. study.
Medications May 01, 2013 | not rated yet | 0
Children can get five to 10 colds each year, so it's not surprising that adults often turn to over-the-counter cough and cold medicines to relieve their little ones' symptoms. But a new University of Michigan poll shows that ...
Pediatrics Apr 22, 2013 | not rated yet | 0
Professor of neurology, physician, and author Oliver Sacks M.D. has outlined case studies of hallucinations of musical notation, and commented on the neural basis of such hallucinations, in a new paper for the neurology journal ...
Neuroscience Apr 04, 2013 | not rated yet | 1
Changes in brain function may foreshadow schizophrenia as early as puberty, nearly a decade before most patients begin showing obvious symptoms, new research from the University of North Carolina shows.
Psychology & Psychiatry Apr 04, 2013 | 4.5 / 5 (2) | 0
University of Liege researchers have demonstrated that the physiological mechanisms triggered during NDE lead to a more vivid perception not only of imagined events in the history of an individual but also of real events ...
Psychology & Psychiatry Mar 28, 2013 | 3.8 / 5 (16) | 6 |
The strongest predictor of whether a man is developing dementia with Lewy bodies—the second most common form of dementia in the elderly—is whether he acts out his dreams while sleeping, Mayo Clinic researchers have discovered. ...
Neuroscience Mar 21, 2013 | 5 / 5 (2) | 0
(Medical Xpress)—Ever find yourself briefly paralyzed as you're falling asleep or just waking up? It's a phenomenon is called sleep paralysis, and it's often accompanied by vivid sensory or perceptual experiences, which ...
Psychology & Psychiatry Mar 04, 2013 | 5 / 5 (1) | 0 |
Two years ago, researcher Josef Bless was listening to music on his phone when he suddenly had an idea.
Psychology & Psychiatry Feb 08, 2013 | 5 / 5 (1) | 0
Antipsychotic drugs, used in the treatment of psychotic disorders involving severe delusions and hallucinations, have been studied for more than 70 years. Currently available antipsychotic drugs, however, only alleviate certain ...
Psychology & Psychiatry Feb 01, 2013 | not rated yet | 1
The Dutch food and consumer watchdog issued a warning Thursday about a batch of herbal tea imported from Bulgaria which may have been contaminated by a highly toxic nightshade plant.
Health Jan 24, 2013 | not rated yet | 0
Wild animals may be a key contributor to the continuing spread of African sleeping sickness, new research published in PLOS Computational Biology shows. The West African form of the disease, also known as Gambiense Human ...
Diseases, Conditions, Syndromes Jan 17, 2013 | not rated yet | 0
Experimental agent briefly eases depression rapidly in test: Works in brain like ketamine, with fewer side effects
(Medical Xpress)—A drug that works through the same brain mechanism as the fast-acting antidepressant ketamine briefly improved treatment-resistant patients' depression symptoms in minutes, with minimal untoward side effects, ...
Psychology & Psychiatry Dec 11, 2012 | 5 / 5 (1) | 0 |
Researchers at the University of California, San Diego School of Medicine and the VA San Diego Healthcare System have found that deficiencies in the neural processing of simple auditory tones can evolve into ...
Neuroscience Nov 30, 2012 | 4 / 5 (1) | 2 |
A hallucination, in the broadest sense, is a perception in the absence of a stimulus. In a stricter sense, hallucinations are defined as perceptions in a conscious and awake state in the absence of external stimuli which have qualities of real perception, in that they are vivid, substantial, and located in external objective space. The latter definition distinguishes hallucinations from the related phenomena of dreaming, which does not involve wakefulness; illusion, which involves distorted or misinterpreted real perception; imagery, which does not mimic real perception and is under voluntary control; and pseudohallucination, which does not mimic real perception, but is not under voluntary control. Hallucinations also differ from "delusional perceptions", in which a correctly sensed and interpreted genuine perception is given some additional (and typically bizarre) significance.
Hallucinations can occur in any sensory modality — visual, auditory, olfactory, gustatory, tactile, proprioceptive, equilibrioceptive, nociceptive, and thermoceptive.
A mild form of hallucination is known as a disturbance, and can occur in any of the senses above. These may be things like seeing movement in peripheral vision, or hearing faint noises and voices.
Hypnagogic hallucinations and hypnopompic hallucinations are considered normal phenomena. Hypnagogic hallucinations can occur as one is falling asleep and hypnopompic hallucinations occur when one is waking up.
Hallucinations can also be associated with drug or alcohol use (particularly deliriants), sleep deprivation, psychosis, neurological disorders, and delirium tremens.
For more information about Hallucination, read the full article at
This text uses material from Wikipedia and is available under the GNU Free Documentation License.