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Visual release hallucinations

January 01, 1970

Visual release hallucinations, also known as Charles Bonnet syndrome or CBS, are a type of psychophysical visual disturbance in which a person with partial or severe blindness experiences visual hallucinations.

Visual release hallucinations
Other namesCharles Bonnet syndrome (CBS)
SpecialtyPsychiatry, ophthalmology, optometry, neurology
Diagnostic methodPsychosis, delirium, or dementia[1]

First described by Charles Bonnet in 1760,[2][3] the term Charles Bonnet syndrome was first introduced into English-speaking psychiatry in 1982.[4] A related type of hallucination that also occurs with lack of visual input is the closed-eye hallucination.

Signs and symptoms edit

People with significant vision loss may have vivid recurrent visual hallucinations (fictive visual percepts).[1] One characteristic of these hallucinations is that they usually are "lilliputian" (hallucinations in which the characters or objects are smaller than normal).[5] Depending on the content, visual hallucinations can be classified as either simple or complex.[1] Simple visual hallucinations are commonly characterized by shapes, photopsias, and grid-like patterns.[6] Complex visual hallucinations consist of highly detailed representations of people and objects.[6] The most common hallucination is of faces or cartoons.[7] Those affected understand that the hallucinations are not real, and the hallucinations are only visual, that is, they do not occur in any other senses (such as hearing, smell or taste).[8][9] Visual hallucinations generally appear when the eyes are open, fading once the visual gaze shifts.[1] It is widely claimed that sensory deprivation is instrumental in the progression of CBS.[10] During episodes of inactivity, hallucinations are more likely to occur.[1] The majority of those with CBS describe the duration of hallucinations to continue for up to a few minutes, multiple times a day or week.[1]

Even though people of all ages may be affected by Charles Bonnet syndrome, those within the age range of 70 to 80 are primarily affected.[1] Among older adults (> 65 years) with significant vision loss, the prevalence of Charles Bonnet syndrome has been reported to be between 10% and 40%; a 2008 Australian study found the prevalence to be 17.5%.[3] Two Asian studies, however, report a much lower prevalence.[11][12] The high incidence of underreporting this disorder is the greatest hindrance to determining the exact prevalence.[9] Underreporting is thought to be a result of those with the condition being afraid to discuss the symptoms out of fear that they will be labeled of unsound mind.[9]

Pathophysiology edit

 
Anatomical illustration of neuroanatomy of human vision

There is no general consensus on the definition of CBS.[6] Predominant factors correlated with CBS are a decrease of visual acuity, visual field loss, and elderly age.[1] While characteristic features of visual hallucinations are not specifically linked to the anatomical site of the ocular injury, they usually match to the location of visual loss.[1] The most commonly accepted theory for Charles Bonnet syndrome proposes that extreme visual impairment promotes sensory deafferentation, leading to disinhibition, thus resulting in sudden neural firings of the visual cortical regions.[1] A few studies record that visual hallucinations are likely to be concentrated in the blind regions.[10] Functional magnetic resonance imaging (fMRI) of Charles Bonnet syndrome patients displays a relationship between visual hallucinations and activity in the ventral occipital lobe.[1] A connection between age-related macular degeneration (AMD) and colored visual hallucinations has been presented.[6] Color vision signals travel through the parvocellular layers of the lateral geniculate nucleus (LGN), later transmitting down the color regions of the ventral visual pathway.[6] Due to cone photoreceptor damage located in the macula, there is a significant reduction of visual input to the visual association cortex, stirring endogenous activation in the color areas and thus leading to colored hallucinations.[6] Patients with CBS alongside macular degeneration exhibit hyperactivity in the color areas of the visual association cortex (as shown in fMRIs).[6] Those who have significant ocular disease yet maintain visual acuity may still be susceptible to CBS.[6]

The Deep Boltzmann Machine (DBM) is a way of utilizing an undirected probabilistic process in a neural framework.[10] Researchers argue that the DBM has the ability to model features of cortical learning, perception, and the visual cortex (the locus of visual hallucinations).[10] Compelling evidence details the role homeostatic operations in the cortex play in regards to stabilizing neuronal activity.[10] By using the DBM, researchers show that when sensory input is absent, neuron excitability is influenced, thus potentially triggering complex hallucinations.[10]

 
Acetylcholine pathway

A short-term change in the levels of feedforward and feedback flows of information may intensely affect the presence of hallucinations.[10] In periods of drowsiness, CBS related hallucinations are more prone to arise.[10] Disrupting cortical homeostatic processes after vision has been lost may prevent or setback the emergence of hallucinations.[10] At varying stages of the cortical grading, acetylcholine (ACh) may impact the balance of thalamic and intracortical inputs as well as the balance in between bottom-up and top-down.[10] Particularly in CBS, a shortage of acetylcholine at cortical locations should correspond to the onset of hallucinations.[10]

The syndrome can also develop after bilateral optic nerve damage due to methyl alcohol poisoning.[13]

Diagnosis edit

A variety of disciplines including optometry, ophthalmology, geriatric medicine, psychiatry, and neurology play a part in securing the diagnosis of CBS.[6] Since CBS is not commonly recognized by all clinicians, it oftentimes goes misdiagnosed and identified as psychosis, delirium, or dementia.[1] As a result of this, it is estimated that almost 60% of CBS patients hesitate to notify their physicians.[1] By focusing on the specific type of visual hallucination, one may find an accurate diagnosis.[1] If a patient presents symptoms indicative of Charles Bonnet syndrome, basic laboratory examinations like metabolic panel and blood count tests, as well as neuroimaging, may aid in an accurate diagnosis.[1]

Prognosis edit

There is no treatment of proven effectiveness for CBS.[6] For those experiencing CBS, knowing that they have this syndrome and not a mental illness seems to be the most comforting treatment so far, as it improves their ability to cope with the hallucinations.[6] As time passes from the initial onset of visual hallucinations, studies show that around 60% of those living with CBS feel that visual hallucinations have no effect on their lives, 33% of people feel that the hallucinations are disruptive to their lives, and 7% of people even find pleasure in the hallucinations.[6]

A large proportion of those with CBS develop the visual hallucinations as vision begins to deteriorate and stop hallucinating once vision is entirely gone.[10] Complex hallucinations may progress over time if the primary loss of vision is due to damage of the early cortical areas.[10] If activation of the early cortical areas is suppressed when CBS symptoms have already been exhibited, hallucinations may temporarily terminate.[10] Also, interrupting vision for a short time by closing the eyes or blinking may be helpful.[3]

It is possible for a stressful life event to alter the disposition of hallucinatory experiences as well as the emotional experiences (from unconcerning to concerning) in CBS.[14] As expressed in some patients, an interplay between CBS and an acute or post-traumatic stress disorder may exist.[14] The role that trauma plays in CBS may affect how and when a hallucinatory episode is triggered.[14]

History edit

 
Charles Bonnet, the first person to describe the syndrome.

The disease was first noted by the Swiss naturalist Charles Bonnet, who described the condition in 1760.[1] He documented it in his 90-year-old grandfather[15] who was nearly blind from cataracts in both eyes.[7] After Bonnet's grandfather received bilateral cataract surgery, his vision evolved from slightly better to complete deterioration over time.[6] It was around this period that his visual hallucinations started.[6] His hallucinations consisted of perceptions of men, women, birds, carriages, buildings, tapestries, physically impossible circumstances and scaffolding patterns.[7][16] Even though his health was in good shape and he had an absence of any psychiatric disorders, the source of the hallucinations remained unknown.[6] At forty years old, Charles Bonnet himself developed an unrevealed cause of severe vision loss and experienced the hallucinations.[6]

In 1936, Jean Lhermitte and Julian de Ajuriaguerra, concluded that visual hallucinations consist of thalamic lesions as well as ocular pathology.[6]

In 1967, French-Swiss neurologist, Georges de Morsier, coined the term Charles Bonnet syndrome in Bonnet's honor.[2][1] De Morsier's description of CBS implies a concentrated neurodegeneration, usually occurring in the elderly with typical cognition.[6] In psychiatric literature, the most commonly accepted interpretation of CBS is that of Gold and Rabins'.[6] In 1989, they detailed that the hallucinations associated with CBS are not affecting other sensory modalities.[6] They believed that the visual hallucinations are oftentimes stereotyped, persistent, and/or repetitive in nature.[6]

Society and culture edit

The syndrome is discussed in:

See also edit

References edit

  1. ^ a b c d e f g h i j k l m n o p q Jan, Tiffany; del Castillo, Jorge (2012). "Visual Hallucinations: Charles Bonnet Syndrome". Western Journal of Emergency Medicine. 13 (6): 544–547. doi:10.5811/westjem.2012.7.12891. ISSN 1936-900X. PMC 3555593. PMID 23357937.
  2. ^ a b de Morsier, G (1967). "Le syndrome de Charles Bonnet: hallucinations visuelles des vieillards sans deficience mentale" [Charles Bonnet syndrome: visual hallucinations of the elderly without mental impairment]. Ann. Méd.-Psychol. (in French). 125: 677–701.
  3. ^ a b c Vukicevic, Meri; Fitzmaurice, Kerry (2008). "Butterflies and black lacy patterns: The prevalence and characteristics of Charles Bonnet hallucinations in an Australian population". Clinical & Experimental Ophthalmology. 36 (7): 659–665. doi:10.1111/j.1442-9071.2008.01814.x. PMID 18983551. S2CID 205492511.
  4. ^ Berrios, German E.; Brook, Peter (1982). "The Charles Bonnet Syndrome and the Problem of Visual Perceptual Disorders in the Elderly". Age and Ageing. 11 (1): 17–23. doi:10.1093/ageing/11.1.17. PMID 7041567.
  5. ^ Vojniković, Bozo; Radeljak, Sanja; Dessardo, Sandro; Zarković-Palijan, Tija; Bajek, Goran; Linsak, Zeljko (2010). "What associates Charles Bonnet syndrome with age-related macular degeneration?". Collegium Antropologicum. 34 (Suppl 2): 45–48. ISSN 0350-6134. PMID 21305724.
  6. ^ a b c d e f g h i j k l m n o p q r s t u Pang, Linda (2016). "Hallucinations Experienced by Visually Impaired: Charles Bonnet Syndrome". Optometry and Vision Science. 93 (12): 1466–1478. doi:10.1097/OPX.0000000000000959. ISSN 1538-9235. PMC 5131689. PMID 27529611.
  7. ^ a b c Sacks, Oliver. "What hallucination reveals about our minds". Ted.com. from the original on 2013-07-08. Retrieved 2013-07-03.
  8. ^ Schultz, G; Melzack, R (1991). "The Charles Bonnet syndrome: 'phantom visual images'". Perception. 20 (6): 809–25. doi:10.1068/p200809. PMID 1816537. S2CID 22318715.
  9. ^ a b c Mogk, Lylas G.; Riddering, Anne; Dahl, David; Bruce, Cathy; Brafford, Shannon (2000). "Charles Bonnet Syndrome In Adults with Visual Impairments from Age-Related Macular Degeneration". In Arditi, Aries; Horowitz, Amy; Lang, Mary Ann; Rosenthal, Bruce; Seidman, Karen; Stuen, Cynthia (eds.). Vision Rehabilitation. CRC Press. pp. 117–9. ISBN 978-90-265-1631-3.
  10. ^ a b c d e f g h i j k l m n Reichert, David P.; Series, Peggy; Storkey, Amos J. "Hallucinations in Charles Bonnet Syndrome Induced by Homeostasis: a Deep Boltzmann Machine Model" (PDF). NIPS Proceedings. University of Edinburgh.
  11. ^ Tan, C S H; Lim, V. S.; Ho, D. Y.; Yeo, E; Ng, B. Y.; Au Eong, K. G. (2004). "Charles Bonnet syndrome in Asian patients in a tertiary ophthalmic centre". British Journal of Ophthalmology. 88 (10): 1325–9. doi:10.1136/bjo.2004.041947. PMC 1772345. PMID 15377560.
  12. ^ Abbott, Emily J.; Connor, Gillian B.; Artes, Paul H.; Abadi, Richard V. (2007). "Visual Loss and Visual Hallucinations in Patients with Age-Related Macular Degeneration (Charles Bonnet Syndrome)". Investigative Ophthalmology & Visual Science. 48 (3): 1416–23. doi:10.1167/iovs.06-0942. PMID 17325191.
  13. ^ Olbrich, H. M.; Lodemann, E; Engelmeier, M. P. (1987). "Optical hallucinations in the aged with diseases of the eye". Zeitschrift für Gerontologie. 20 (4): 227–229. PMID 3660920.
  14. ^ a b c Vukicevic, Meri (2010-08-02). "Frightening visual hallucinations: atypical presentation of Charles Bonnet syndrome triggered by the Black Saturday bushfires". The Medical Journal of Australia. 193 (3): 181–182. doi:10.5694/j.1326-5377.2010.tb03843.x. PMID 20678049. S2CID 35769299.
  15. ^ Bonnet Charles (1760) Essai Analytique sur les facultés de l'âme. Copenhagen: Philibert, pp. 426–428
  16. ^ "Bonnet's syndrome (Charles Bonnet)". Whonamedit. from the original on 2014-02-23. Retrieved 2013-07-03.
  17. ^ V.S. Ramachandran; Sandra Blakeslee (1988). Phantoms in the Brain. HarperCollins. pp. 85–7.

External links edit

  • Information on Charles Bonnet syndrome from RNIB
  • National Public Radio article with an audio segment about Charles Bonnet syndrome
  • Oliver Sacks: What hallucination reveals about our minds 2013-07-08 at the Wayback Machine Ted Talk, Feb 2009.
  • 'Damn Interesting' article on Charles Bonnet syndrome
  • W Burke (2002). "The neural basis of Charles Bonnet hallucinations: a hypothesis". Journal of Neurology, Neurosurgery & Psychiatry. 73 (5): 535–541. doi:10.1136/jnnp.73.5.535. PMC 1738134. PMID 12397147.

January 01, 1970
visual, release, hallucinations, also, known, charles, bonnet, syndrome, type, psychophysical, visual, disturbance, which, person, with, partial, severe, blindness, experiences, visual, hallucinations, other, namescharles, bonnet, syndrome, specialtypsychiatry. Visual release hallucinations also known as Charles Bonnet syndrome or CBS are a type of psychophysical visual disturbance in which a person with partial or severe blindness experiences visual hallucinations Visual release hallucinationsOther namesCharles Bonnet syndrome CBS SpecialtyPsychiatry ophthalmology optometry neurologyDiagnostic methodPsychosis delirium or dementia 1 First described by Charles Bonnet in 1760 2 3 the term Charles Bonnet syndrome was first introduced into English speaking psychiatry in 1982 4 A related type of hallucination that also occurs with lack of visual input is the closed eye hallucination Contents 1 Signs and symptoms 2 Pathophysiology 3 Diagnosis 4 Prognosis 5 History 6 Society and culture 7 See also 8 References 9 External linksSigns and symptoms editPeople with significant vision loss may have vivid recurrent visual hallucinations fictive visual percepts 1 One characteristic of these hallucinations is that they usually are lilliputian hallucinations in which the characters or objects are smaller than normal 5 Depending on the content visual hallucinations can be classified as either simple or complex 1 Simple visual hallucinations are commonly characterized by shapes photopsias and grid like patterns 6 Complex visual hallucinations consist of highly detailed representations of people and objects 6 The most common hallucination is of faces or cartoons 7 Those affected understand that the hallucinations are not real and the hallucinations are only visual that is they do not occur in any other senses such as hearing smell or taste 8 9 Visual hallucinations generally appear when the eyes are open fading once the visual gaze shifts 1 It is widely claimed that sensory deprivation is instrumental in the progression of CBS 10 During episodes of inactivity hallucinations are more likely to occur 1 The majority of those with CBS describe the duration of hallucinations to continue for up to a few minutes multiple times a day or week 1 Even though people of all ages may be affected by Charles Bonnet syndrome those within the age range of 70 to 80 are primarily affected 1 Among older adults gt 65 years with significant vision loss the prevalence of Charles Bonnet syndrome has been reported to be between 10 and 40 a 2008 Australian study found the prevalence to be 17 5 3 Two Asian studies however report a much lower prevalence 11 12 The high incidence of underreporting this disorder is the greatest hindrance to determining the exact prevalence 9 Underreporting is thought to be a result of those with the condition being afraid to discuss the symptoms out of fear that they will be labeled of unsound mind 9 Pathophysiology edit nbsp Anatomical illustration of neuroanatomy of human vision There is no general consensus on the definition of CBS 6 Predominant factors correlated with CBS are a decrease of visual acuity visual field loss and elderly age 1 While characteristic features of visual hallucinations are not specifically linked to the anatomical site of the ocular injury they usually match to the location of visual loss 1 The most commonly accepted theory for Charles Bonnet syndrome proposes that extreme visual impairment promotes sensory deafferentation leading to disinhibition thus resulting in sudden neural firings of the visual cortical regions 1 A few studies record that visual hallucinations are likely to be concentrated in the blind regions 10 Functional magnetic resonance imaging fMRI of Charles Bonnet syndrome patients displays a relationship between visual hallucinations and activity in the ventral occipital lobe 1 A connection between age related macular degeneration AMD and colored visual hallucinations has been presented 6 Color vision signals travel through the parvocellular layers of the lateral geniculate nucleus LGN later transmitting down the color regions of the ventral visual pathway 6 Due to cone photoreceptor damage located in the macula there is a significant reduction of visual input to the visual association cortex stirring endogenous activation in the color areas and thus leading to colored hallucinations 6 Patients with CBS alongside macular degeneration exhibit hyperactivity in the color areas of the visual association cortex as shown in fMRIs 6 Those who have significant ocular disease yet maintain visual acuity may still be susceptible to CBS 6 The Deep Boltzmann Machine DBM is a way of utilizing an undirected probabilistic process in a neural framework 10 Researchers argue that the DBM has the ability to model features of cortical learning perception and the visual cortex the locus of visual hallucinations 10 Compelling evidence details the role homeostatic operations in the cortex play in regards to stabilizing neuronal activity 10 By using the DBM researchers show that when sensory input is absent neuron excitability is influenced thus potentially triggering complex hallucinations 10 nbsp Acetylcholine pathway A short term change in the levels of feedforward and feedback flows of information may intensely affect the presence of hallucinations 10 In periods of drowsiness CBS related hallucinations are more prone to arise 10 Disrupting cortical homeostatic processes after vision has been lost may prevent or setback the emergence of hallucinations 10 At varying stages of the cortical grading acetylcholine ACh may impact the balance of thalamic and intracortical inputs as well as the balance in between bottom up and top down 10 Particularly in CBS a shortage of acetylcholine at cortical locations should correspond to the onset of hallucinations 10 The syndrome can also develop after bilateral optic nerve damage due to methyl alcohol poisoning 13 Diagnosis editA variety of disciplines including optometry ophthalmology geriatric medicine psychiatry and neurology play a part in securing the diagnosis of CBS 6 Since CBS is not commonly recognized by all clinicians it oftentimes goes misdiagnosed and identified as psychosis delirium or dementia 1 As a result of this it is estimated that almost 60 of CBS patients hesitate to notify their physicians 1 By focusing on the specific type of visual hallucination one may find an accurate diagnosis 1 If a patient presents symptoms indicative of Charles Bonnet syndrome basic laboratory examinations like metabolic panel and blood count tests as well as neuroimaging may aid in an accurate diagnosis 1 Prognosis editThere is no treatment of proven effectiveness for CBS 6 For those experiencing CBS knowing that they have this syndrome and not a mental illness seems to be the most comforting treatment so far as it improves their ability to cope with the hallucinations 6 As time passes from the initial onset of visual hallucinations studies show that around 60 of those living with CBS feel that visual hallucinations have no effect on their lives 33 of people feel that the hallucinations are disruptive to their lives and 7 of people even find pleasure in the hallucinations 6 A large proportion of those with CBS develop the visual hallucinations as vision begins to deteriorate and stop hallucinating once vision is entirely gone 10 Complex hallucinations may progress over time if the primary loss of vision is due to damage of the early cortical areas 10 If activation of the early cortical areas is suppressed when CBS symptoms have already been exhibited hallucinations may temporarily terminate 10 Also interrupting vision for a short time by closing the eyes or blinking may be helpful 3 It is possible for a stressful life event to alter the disposition of hallucinatory experiences as well as the emotional experiences from unconcerning to concerning in CBS 14 As expressed in some patients an interplay between CBS and an acute or post traumatic stress disorder may exist 14 The role that trauma plays in CBS may affect how and when a hallucinatory episode is triggered 14 History edit nbsp Charles Bonnet the first person to describe the syndrome The disease was first noted by the Swiss naturalist Charles Bonnet who described the condition in 1760 1 He documented it in his 90 year old grandfather 15 who was nearly blind from cataracts in both eyes 7 After Bonnet s grandfather received bilateral cataract surgery his vision evolved from slightly better to complete deterioration over time 6 It was around this period that his visual hallucinations started 6 His hallucinations consisted of perceptions of men women birds carriages buildings tapestries physically impossible circumstances and scaffolding patterns 7 16 Even though his health was in good shape and he had an absence of any psychiatric disorders the source of the hallucinations remained unknown 6 At forty years old Charles Bonnet himself developed an unrevealed cause of severe vision loss and experienced the hallucinations 6 In 1936 Jean Lhermitte and Julian de Ajuriaguerra concluded that visual hallucinations consist of thalamic lesions as well as ocular pathology 6 In 1967 French Swiss neurologist Georges de Morsier coined the term Charles Bonnet syndrome in Bonnet s honor 2 1 De Morsier s description of CBS implies a concentrated neurodegeneration usually occurring in the elderly with typical cognition 6 In psychiatric literature the most commonly accepted interpretation of CBS is that of Gold and Rabins 6 In 1989 they detailed that the hallucinations associated with CBS are not affecting other sensory modalities 6 They believed that the visual hallucinations are oftentimes stereotyped persistent and or repetitive in nature 6 Society and culture editThe syndrome is discussed in Vilayanur S Ramachandran s book Phantoms in the Brain Ramachandran suggests that James Thurber who was blinded in one eye as a child may have derived his extraordinary imagination from the syndrome 17 Vikram Chandra s book Sacred Games 2006 David Eagleman s book Incognito The Secret Lives of the Brain Oliver Sacks 2012 book Hallucinations The Indian movie Jawan of Vellimala released in 2012 in which Mammootty is a victim of the syndrome The Black Canvas 2014 a chamber opera by the Greek composer Spyros Syrmos is about a celebrated painter whose visions are caused by CBS Margaret Atwood s short story Torching the Dusties Deborah Lawrenson s novel The Lantern 2011 Gareth Brookes graphic novel A Thousand Coloured Castles 2017 Dealt 2017 documentary about notable card mechanic Richard Turner The 2019 Netflix film Velvet Buzzsaw The Doc Martin episode One Night Only 2022 Season 10 Episode 2 depicts Dr Ellingham diagnosing a patient with Charles Bonnet syndrome See also editPhantom eye syndrome condition of pain in a lost eyePages displaying wikidata descriptions as a fallback Musical ear syndrome Auditory hallucination associated with hearing loss Ganzfeld effect Psychological phenomenon Hypnagogia State of consciousness leading into sleep Anton Babinski syndrome Rare symptom of brain damage where those affected deny being blindPages displaying short descriptions of redirect targetsReferences edit a b c d e f g h i j k l m n o p q Jan Tiffany del Castillo Jorge 2012 Visual Hallucinations Charles Bonnet Syndrome Western Journal of Emergency Medicine 13 6 544 547 doi 10 5811 westjem 2012 7 12891 ISSN 1936 900X PMC 3555593 PMID 23357937 a b de Morsier G 1967 Le syndrome de Charles Bonnet hallucinations visuelles des vieillards sans deficience mentale Charles Bonnet syndrome visual hallucinations of the elderly without mental impairment Ann Med Psychol in French 125 677 701 a b c Vukicevic Meri Fitzmaurice Kerry 2008 Butterflies and black lacy patterns The prevalence and characteristics of Charles Bonnet hallucinations in an Australian population Clinical amp Experimental Ophthalmology 36 7 659 665 doi 10 1111 j 1442 9071 2008 01814 x PMID 18983551 S2CID 205492511 Berrios German E Brook Peter 1982 The Charles Bonnet Syndrome and the Problem of Visual Perceptual Disorders in the Elderly Age and Ageing 11 1 17 23 doi 10 1093 ageing 11 1 17 PMID 7041567 Vojnikovic Bozo Radeljak Sanja Dessardo Sandro Zarkovic Palijan Tija Bajek Goran Linsak Zeljko 2010 What associates Charles Bonnet syndrome with age related macular degeneration Collegium Antropologicum 34 Suppl 2 45 48 ISSN 0350 6134 PMID 21305724 a b c d e f g h i j k l m n o p q r s t u Pang Linda 2016 Hallucinations Experienced by Visually Impaired Charles Bonnet Syndrome Optometry and Vision Science 93 12 1466 1478 doi 10 1097 OPX 0000000000000959 ISSN 1538 9235 PMC 5131689 PMID 27529611 a b c Sacks Oliver What hallucination reveals about our minds Ted com Archived from the original on 2013 07 08 Retrieved 2013 07 03 Schultz G Melzack R 1991 The Charles Bonnet syndrome phantom visual images Perception 20 6 809 25 doi 10 1068 p200809 PMID 1816537 S2CID 22318715 a b c Mogk Lylas G Riddering Anne Dahl David Bruce Cathy Brafford Shannon 2000 Charles Bonnet Syndrome In Adults with Visual Impairments from Age Related Macular Degeneration In Arditi Aries Horowitz Amy Lang Mary Ann Rosenthal Bruce Seidman Karen Stuen Cynthia eds Vision Rehabilitation CRC Press pp 117 9 ISBN 978 90 265 1631 3 a b c d e f g h i j k l m n Reichert David P Series Peggy Storkey Amos J Hallucinations in Charles Bonnet Syndrome Induced by Homeostasis a Deep Boltzmann Machine Model PDF NIPS Proceedings University of Edinburgh Tan C S H Lim V S Ho D Y Yeo E Ng B Y Au Eong K G 2004 Charles Bonnet syndrome in Asian patients in a tertiary ophthalmic centre British Journal of Ophthalmology 88 10 1325 9 doi 10 1136 bjo 2004 041947 PMC 1772345 PMID 15377560 Abbott Emily J Connor Gillian B Artes Paul H Abadi Richard V 2007 Visual Loss and Visual Hallucinations in Patients with Age Related Macular Degeneration Charles Bonnet Syndrome Investigative Ophthalmology amp Visual Science 48 3 1416 23 doi 10 1167 iovs 06 0942 PMID 17325191 Olbrich H M Lodemann E Engelmeier M P 1987 Optical hallucinations in the aged with diseases of the eye Zeitschrift fur Gerontologie 20 4 227 229 PMID 3660920 a b c Vukicevic Meri 2010 08 02 Frightening visual hallucinations atypical presentation of Charles Bonnet syndrome triggered by the Black Saturday bushfires The Medical Journal of Australia 193 3 181 182 doi 10 5694 j 1326 5377 2010 tb03843 x PMID 20678049 S2CID 35769299 Bonnet Charles 1760 Essai Analytique sur les facultes de l ame Copenhagen Philibert pp 426 428 Bonnet s syndrome Charles Bonnet Whonamedit Archived from the original on 2014 02 23 Retrieved 2013 07 03 V S Ramachandran Sandra Blakeslee 1988 Phantoms in the Brain HarperCollins pp 85 7 External links editInformation on Charles Bonnet syndrome from RNIB National Public Radio article with an audio segment about Charles Bonnet syndrome Oliver Sacks What hallucination reveals about our minds Archived 2013 07 08 at the Wayback Machine Ted Talk Feb 2009 Fortean Times article on Charles Bonnet syndrome Damn Interesting article on Charles Bonnet syndrome W Burke 2002 The neural basis of Charles Bonnet hallucinations a hypothesis Journal of Neurology Neurosurgery amp Psychiatry 73 5 535 541 doi 10 1136 jnnp 73 5 535 PMC 1738134 PMID 12397147 Retrieved from https en wikipedia org w index php title Visual release hallucinations amp oldid 1216932488, wikipedia, wiki, book, books, library,

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