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Topic: Charles Bonnet Syndrome

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In the News (Tue 23 Apr 19)

  Charles Bonnet Syndrome
People with Charles Bonnet Syndrome (or "Bonnet-people") are otherwise mentally sound.
Charles Bonnet Syndrome is more common in older people with a high level of education.
A Swiss philosopher named Charles Bonnet first described this condition in the 1760 when he noticed his grandfather, who was blinded by cataracts, describing birds and buildings that Bonnet could not see.
sprott.physics.wisc.edu /pickover/pc/bonnet.html   (519 words)

  Charles Bonnet - Wikipedia, the free encyclopedia
Charles Bonnet (March 13, 1720 – May 20, 1793), Swiss naturalist and philosophical writer, was born at Geneva, of a French family driven into Switzerland by the religious persecution in the 16th century.
In 1740 Bonnet communicated to the academy of sciences a paper containing a series of experiments establishing what is now termed parthenogenesis in aphides or tree-lice, which obtained for him the honour of being admitted a corresponding member of the academy.
The sensation accompanying this increased flexibility in the nerve is, according to Bonnet, the condition of memory.
en.wikipedia.org /wiki/Charles_Bonnet   (1069 words)

 Charles Bonnet (www.whonamedit.com)
Charles Bonnet was born to a French family driven into Switzerland by the religious persecution in the 16th century.
Charles Bonnet described a lady who insisted of dressing in a death shroud and being put in a coffin.
Bonnet's concept of the essential continuity of life, a consequence of his discovery and preformationist interpretation of parthogenesis, was a major force in the shaping of later evolutionary opinion.
www.whonamedit.com /doctor.cfm/2445.html   (1031 words)

 Charles Bonnet Syndrom
Charles Bonnets Syndrome (CBS), characterised by the presence of complex visual hallucinations in psychologically
Characteristics of hallucinations in 60 patients with Charles Bonnet Syndrome.
A study of the prevalence of the Charles Bonnet syndrome and associated factors in 500 patients attending the University Department of Ophthalmology at Nijmegen.
www.geocities.com /franzbardon/CharlesBonnetSyndrome_e.html   (2544 words)

 A Comparative Look at Hallucinations in Schizophrenics and Sufferers of Charles Bonnet Syndrome, and Their ...
Charles Bonnet syndrome is the onset of hallucinations in psychologically healthy individuals who have become either visually-impaired, or completely blind.
In Charles Bonnet sufferers, hallucinations can usually be recognized (besides by their content) by the fact that they are seen in greater clarity and more detail than what the individual is capable of given their deteriorated vision (4).
Thus, while Charles Bonnet sufferers can perceive a world outside of their hallucinations that does not correspond to those images, a schizophrenic's entire perceptive experience is effected by their condition (5).
serendip.brynmawr.edu /bb/neuro/neuro01/web3/Cohen.html   (1826 words)

 Charles Bonnet Syndrome
Charles Bonnet syndrome (or CBS for short) is a term used to describe the situation when people with sight problems start to see things which they know aren't real.
A Swiss philosopher named Charles Bonnet first described this condition in the 1760 when he noticed his grandfather who was blinded by cataracts describing seeing birds and buildings which were not there.
Charles Bonnet syndrome affects people with sight difficulties and usually only people who have lost their sight later in life.
www.meta-religion.com /Neurology/Disorders/charles_bonnet_syndrome.htm   (1054 words)

 History of Regeneration Research
The Swiss scientist, Charles Bonnet, was greatly influenced by the work of his cousin, Abraham Trembley, and Rene-Antoine Reaumur.
Charles Bonnet was also one of the first scientists to demonstrate that some animals (in his case, aphids) could reproduce parthenogenetically (reproduction by the development of an unfertilized egg) as was predicted by Reaumur.
He also was the first person to recognize the syndrome characterized by hallucinations that occur in the absence of mental illness.
odelberglab.genetics.utah.edu /regen_history.htm   (781 words)

 Body   (Site not responding. Last check: 2007-11-02)
These visual hallucinations in the elderly are sometimes known as the Charles Bonnet syndrome (CBS), named after the Swiss philosopher who described the phenomenon in his grandfather, Charles Lullin, in 1769 (Berrios and Brook, 1982).
A study of patients with Charles Bonnet Syndrome revealed that two of six subsequently developed dementia, which raises the question of whether visual hallucinations in patients with age-related macular degeneration may be a risk factor for or, more likely, an early symptom of dementia (Lalla and Primeau, 1993).
Future studies of visual disorders in young patients, and of brain structure and function with magnetic resonance imaging, single-photon emission computed tomography, and autopsy to examine the role of abnormal neuroanatomy and neurophysiology would be of value to study this phenomenon also.
hubel.sfasu.edu /courseinfo/SL98/macdegen.html   (1271 words)

 Macular Disease Society :: Publications & Information :: What is macular degeneration? :: FAQ   (Site not responding. Last check: 2007-11-02)
Charles Bonnet Syndrome results in hallucinations and occurs in patients who have eye diseases that prevent the normal nerve impulses from reaching the brain.
Charles Bonnet syndrome is estimated to occur in 12% of macular degeneration patients and appears more often in women than men.
The syndrome may be experienced for a period ranging from days to years, although it usually disappears after a few months.
www.maculardisease.org /faq.asp?section=0005000300020001   (1584 words)

 [Charles bonnet syndrome: a case presentation.]
Charles Bonnet syndrome comprises the triad of visual hallucinations, visual sensory deprivation, and preserved cognitive status.
An 80-year-old female with normal cognitive functions in the presence of primary optic atrophy and visual hallucinations was diagnosed with Charles Bonnet syndrome.
My Mother suffers from Charles Bonnet Syndrome and I’m looking to see if there is anyone out there reading this (or having it read to them) who suffers from it too.
counsellingresource.com /medications-research/2005/03/30/charles-bonnet-syndrome-a-case-presentation   (569 words)

 Macula Vision Research Foundation: Charles Bonnet Syndrome
This is partly because of a lack of knowledge about the syndrome and partly because people experiencing it don't talk about their problems out of fear of being thought of as mentally ill.
Charles Bonnet Syndrome affects people with serious sight loss and usually only people who have lost their sight later in life but can affect people of any age, usually appearing after a period of worsening sight.
On the other hand, people with a mental illness have trouble telling the difference between their fantasies and reality and will often come up with complicated explanations for the things they are seeing (sometimes called a delusion).
www.mvrf.org /md101/cbs.html   (1083 words)

 MAPS: "we are all hallucinating, all of the time." --v. ramachandran
In the Charles Bonnet syndrome, the recently blinded cortex receives visually random stimulation from other regions of the brain, and attempts to organize it in visual terms.
Stowens's hallucinations are a result of Charles Bonnet syndrome, a strange but relatively common disorder found in people who have vision problems.
In some ways, researchers say, the hallucinations that define the syndrome are similar to the phenomenon of phantom limbs, where patients still vividly feel limbs that have been amputated, or phantom hearing, where a person hears music or other sounds while going deaf.
www.maps.org /pipermail/maps_forum/2004-October/006240.html   (1079 words)

 Colorful visions of elderly linked to fading eyesight - 3/14/00   (Site not responding. Last check: 2007-11-02)
   Patients who have Charles Bonnet syndrome, named after the Swiss philosopher who documented his grandfather's visions in 1760, report seeing entertaining images such as well-dressed monkeys, girls in white dresses, Canadian Mounties and even "two miniature policemen guiding a midget villain to a tiny prison van," according to one medical journal.
   The reasons for Charles Bonnet syndrome are not totally understood, but Mogk and other doctors feel it is similar to the so-called phantom limb phenomenon, when a person continues to feel a leg or arm after it is amputated.
   After speaking about Charles Bonnet syndrome at the American Academy of Ophthalmology meeting in 1997, Mogk said several doctors later told her that had never heard of it.
www.detnews.com /2000/health/0003/14/D01-15651.htm   (1304 words)

 Charles Bonnet --  Encyclopædia Britannica
Sarah Gamp, a comic fictional character in Charles Dickens' novel Martin Chuzzlewit (1844), is a high-spirited and sketchily trained nurse-midwife who is as enthusiastic at laying out a corpse as she is at delivering a baby.
The character is famous for her bulky umbrella, enormous bonnet, and constant reference to the imaginary Mrs.
Usually known as the prince of Wales, Charles is also earl of Chester, duke of Cornwall, duke of Rothesay, earl of Carrick, and baron of Renfrew, among other titles.
www.britannica.com /eb/article-9080625?tocId=9080625   (728 words)

 Charles Bonnet syndrome precipitated by brimonidine tartrate eye drops -- Tomsak et al. 87 (7): 917 -- British Journal ...
Charles Bonnet syndrome precipitated by brimonidine tartrate eye drops -- Tomsak et al.
Bonnet syndrome; CBS) shortly after beginning the use of BT eye drops.
The Charles Bonnet syndrome is characterised by persistent or
bjo.bmjjournals.com /cgi/content/full/87/7/917   (621 words)

 Charles Bonnet syndrome--elderly people and visual hallucinations -- Jacob et al. 328 (7455): 1552 -- BMJ
Bonnet syndrome occurs in 1.85-3.5% of psychogeriatric patients
Doctors are unfamiliar with the syndrome as a possible diagnosis.
Burke W. The neural basis of Charles Bonnet hallucinations: a hypothesis.
bmj.bmjjournals.com /cgi/content/full/328/7455/1552?ecoll   (1242 words)

 Visual Hallucinations: Another Argument for Brain Equals Behavior
Charles Bonnet syndrome is the onset of hallucinations in psychologically healthy individuals who have recently become blind or seeing impaired.
These hallucinations are experienced identically to normal seeing, however they are distinguishable from reality because of their content and the fact that they often appear in clearer and greater detail than Charles Bonnet patients (whose visions have been impaired or lost) would naturally see (3).
Charles Bonnet sufferers do, and an important thing to remember is that just because they don't respond to their hallucinations as if they were real does not mean that they do not affect their behavior.
serendip.brynmawr.edu /bb/neuro/neuro01/web2/Cohen.html   (1078 words)

 Guardian Unlimited | Archive Search
The distinguishing feature of Charles Bonnet syndrome is that the patients are in a clear state of consciousness and usually quite aware that what they are seeing is an hallucination.
As one Charles Bonnet patient put it: "These images have nothing to do with me." The images vary between cases but can be quite consistent.
One was even told by her GP: "You'd better not talk about such silly things!" A real benefit of recent research is the reassurance to patients that they are entirely sane and that Charles Bonnet syndrome is nothing to do with madness.
www.guardian.co.uk /Archive/Article/0,4273,4078348,00.html   (974 words)

 Blind World - Requested Article   (Site not responding. Last check: 2007-11-02)
He replied at once saying that the effect in visually impaired people was known to medical specialists as the "Charles Bonnet Syndrome".
Charles Bonnet was an 18th century Swiss philosopher, the first person to describe the presence of visual hallucinations in psychologically normal people when he noticed his grandfather, who was blinded by cataracts, claiming to see birds and buildings that were not there.
It was thought to be a fairly rare condition until as recently as the 1980s when research indicated that its incidence was in fact moderately widespread in elderly and visually handicapped people.
home.earthlink.net /~blindworld5/RESEARCH/4-10-27-01.htm   (1969 words)

 Sensory deprivation
Though Bonnet's elderly uncle knew that the objects he saw were not real, his experiences were still quite powerful.
When they examined fourteen new cases of Charles Bonnet syndrome, Schultz and Melzack (1993) verified that the hallucinations were not the result of drugs or mental conditions such as dementia, depression or anxiety.
In the Charles Bonnet syndrome, the sensory starvation that set the stage for the hallucinations was accidental --the result of a naturally occurring vision impairment.
www.bio.brandeis.edu /~sekuler/senpro/topic_1_stuff/sensory_deprivation.html   (926 words)

 EHS: The Retina Atlas Abstract of the Week   (Site not responding. Last check: 2007-11-02)
Charles Bonnet syndrome is the presence of visual hallucinations, both formed and unformed, in the presence of decreased visual acuity, often from age-related macular degeneration.
Although a sensory deprivation model is the most compelling explanation of this phenomenon, other risk factors, including decreased cognitive scores and a history of cerebrovascular accident, have lent credence to the idea of an organic brain dysfunction.
The authors of this study sought to document the natural history of the Charles Bonnet syndrome and to establish whether these symptoms are associated with the development of dementia.
www3.us.elsevierhealth.com /cgi-bin/Mosby/CDOnline/YannuzziAbs?507   (685 words)

 The anatomy of conscious vision: an fMRI study of visual hallucinations - Nature Neuroscience   (Site not responding. Last check: 2007-11-02)
We found that hallucinations of color, faces, textures and objects correlate with cerebral activity in ventral extrastriate visual cortex, that the content of the hallucinations reflects the functional specializations of the region and that patients who hallucinate have increased ventral extrastriate activity, which persists between hallucinations.
In patients with the Charles Bonnet syndrome, this stimulus evoked activity in the striate cortex but failed to do so in the fusiform and lingual gyri (Fig.
Eight patients with the Charles Bonnet syndrome (seven male, one female) were selected from a questionnaire-based study of visual hallucinations at the Institute of Psychiatry.
www.nature.com /neuro/journal/v1/n8/full/nn1298_738.html   (2874 words)

 Charles Bonnet syndrome: an example of cortical dissociation syndrome affecting vision? -- COLE 71 (1): 134 -- Journal ...
Charles Bonnet syndrome: an example of cortical dissociation syndrome affecting vision?
Chaudhuri and his associates cannot be really criticised for using the eponym "Charles Bonnet syndrome" for the "triad of
Cole M. When the left brain is not right the right brain may be left: report of personal experience of occipital hemianopia.
jnnp.bmjjournals.com /cgi/content/full/71/1/134   (406 words)

 Charles Bonnet's syndrome: complete remission of complex visual hallucinations treated by gabapentin -- PAULIG and ...
Charles Bonnet's syndrome: complete remission of complex visual hallucinations treated by gabapentin -- PAULIG and MENTRUP 70 (6): 813 -- Journal of Neurology, Neurosurgery, and Psychiatry
Charles Bonnet's syndrome: complete remission of complex visual hallucinations treated by gabapentin
Therapeutic options for Charles Bonnet's syndrome still remain poor and of uncertain benefit for the individual patient.
jnnp.bmjjournals.com /cgi/content/full/70/6/813   (1399 words)

 Telegraph | Health | 'Now I know all about ghosts'   (Site not responding. Last check: 2007-11-02)
The walls of his study are lined with books, the legacy of a lifetime of scholarship, during which he was Regius Professor of Modern History at Oxford and Master of Peterhouse, Cambridge, yet he has been unable to read them with the naked eye for at least three years.
Dacre got to work to find out as much as he could about the man after whom the syndrome was named, a Swiss natural philosopher of the 18th century.
Charles Bonnet Syndrome - Royal national Institute for the Blind
www.telegraph.co.uk /health/main.jhtml?xml=/health/2002/04/08/hdacre08.xml   (1775 words)

 Damn Interesting » Chuck Bonnet and the Hallucinations
Most of those afflicted with Charles Bonnet Syndrome are people in the early stages of sight loss, and the hallucinations usually begin while their vision is still present but slowly diminishing.
Formal studies have found that Charles Bonnet Syndrome has a higher rate of occurrence in those with higher education and those with creative leanings, a finding which suggests that the concept-association skills inherent in creativity and intelligence may be playing a role.
It is even rumored that Charles Bonnet himself followed in his grandfather's footsteps, witnessing his own set of inexplicable visions when his eyes began to fail him later in life.
www.damninteresting.com /?p=604   (7581 words)

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