Alice in Wonderland syndrome

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Alice in Wonderland syndrome
Other namesTodd's syndrome, [1] Lilliputian hallucinations, dysmetropsia
Alice par John Tenniel 11.png
The perception a person can have due to micropsia, a potential symptom of dysmetropsia. From Lewis Carroll's 1865 novel Alice's Adventures in Wonderland
Specialty Psychiatry, neurology
Symptoms
  • Macropsia - Objects are perceived larger than their actual size [2]
  • Micropsia - Objects are perceived smaller than their actual size [2]
  • Pelopsia - Objects are perceived nearer than they actually are [2]
  • Teleopsia - Objects are perceived much further away than they are [2]
  • Metamorphopsia - Altered perception of shape [2]
  • Tachysensia - Altered perception of time [2]
Complications Impaired vision
Usual onsetBefore, during, or after a migraine

Alice in Wonderland syndrome (AIWS), also known as Todd's syndrome or dysmetropsia, is a neurological disorder that distorts perception. People with this syndrome may experience distortions in their visual perception of objects, such as appearing smaller (micropsia) or larger (macropsia), or appearing to be closer (pelopsia) or farther (teleopsia) than they are. Distortion may also occur for senses other than vision. [3]

Contents

The cause of Alice in Wonderland syndrome is currently not known, but it has often been associated with migraines, head trauma, or viral encephalitis caused by Epstein–Barr virus infection. [4] It is also theorized that AIWS can be caused by abnormal amounts of electrical activity, resulting in abnormal blood flow in the parts of the brain that process visual perception and texture. [5]

Although there are cases of Alice in Wonderland syndrome in both adolescents and adults, it is most commonly seen in children. [2]

Classification

The classification is not universally agreed upon in literature, however, some authors distinguish true Alice in Wonderland syndrome based solely on symptoms related to alterations in a person's body image. In contrast, they utilize the term "Alice in Wonderland-like syndrome" to encompass symptoms associated with changes in perception of vision, time, hearing, touch, or other external perceptions. [2] [6]

Due to the classification of all the clinical features seen in Alice in Wonderland, the table below illustrates theses features and symptoms by type with Type C having a combination of Type A and Type B symptoms. [7]

TypesObligatory symptomsFacultative symptoms
Type AAschematia: partial or total macrosomatognosia or microsomatognosia; paraschematiaDerealization, depersonalization, somatopsychic duality, aberration in judgement of time
Type BMacro- and micropsia and/or tele- and pelopsia. When micropsia and telopsia appear at the same time and for the same object: porropsia

Lilliputianism (people appearing smaller)

Type CType A + type B symptoms

Signs and symptoms

With over 60 associated symptoms, AIWS affects the sense of vision, sensation, touch, and hearing, as well as the perception of one's body image. [8] [9] Migraines, nausea, dizziness, and agitation are also commonly associated symptoms with Alice in Wonderland syndrome. [10] Less frequent symptoms also include: loss of limb control and coordination, memory loss, lingering touch and sound sensations, and emotional instability. [11] Alice in Wonderland syndrome is often associated with distortion of sensory perception, which involves visual, somatosensory, and non-visual symptoms. [12] AIWS is characterized by the individual being able to recognize the distortion in the perception of their own body [13] and is episodic. AIWS episodes vary in length from person to person. Episodes typically last from a few minutes to an hour, and each episode may vary in experience. [14]

Visual distortions

Individuals with AIWS can experience illusions of expansion, reduction, or distortion of their body image, such as microsomatognosia (feeling that their own body or body parts are shrinking), or macrosomatognosia (feeling that their body or body parts are growing taller or larger). These changes in perception are collectively known as metamorphopsias, or Lilliputian hallucinations, [11] which refer to objects appearing either smaller or larger than reality. [15] People with certain neurological diseases may also experience similar visual hallucinations. [16]

Within the category of Lilliputian hallucinations, people may experience either micropsia or macropsia. Micropsia is an abnormal visual condition, usually occurring in the context of visual hallucination, in which the affected person sees objects as being smaller than they are in reality. [17] Macropsia is a condition where the individual sees everything larger than it is. [18] These visual distortions are sometimes classified as "Alice in Wonderland-like syndrome" instead of true Alice in Wonderland syndrome but are often still classified as Alice in Wonderland syndrome by health professionals and researchers since the distinction is not official. [2] [6] Other distortions include teleopsia (objects are perceived further than they actually are) and pelopsia (objects are perceived closer than they actually are). [19]

Depersonalization/derealization

Along with size, mass, and shape distortions of the body, those with Alice in Wonderland syndrome often experience a feeling of disconnection from one's own body, feelings, thoughts, and environment known as depersonalization/derealization. [2] Depersonalization is a term specifically used to express a true detachment from their personal self and identity. It is described as being an observer completely outside of their own actions and behaviors. Derealization is seen as “dreamlike, empty, lifeless, or visually distorted. Drug and alcohol use can exacerbate this symptom into psychosis. [20]

Hearing and time distortions

Individuals experiencing Alice in Wonderland syndrome can also often experience paranoia as a result of disturbances in sound perception. These disturbances can include the amplification of soft sounds or the misinterpretation of common sounds. [21] [11] Other auditory changes include distortion in pitch and tone and hearing indistinguishable and strange voices, noises, or music. [10]

A person affected by AIWS may also lose a sense of time, a problem similar to the lack of spatial perspective brought on by visual distortion. [2] This condition is known as tachysensia. For those with tachysensia, time may seem to pass very slowly, similar to an LSD experience, and the lack of time and space perspective can also lead to a distorted sense of velocity. For example, an object could be moving extremely slowly in reality, but to a person experiencing time distortions, it could seem that the object was sprinting uncontrollably along a moving walkway, leading to severe, overwhelming disorientation. [22] Having symptoms of tachysensia is correlated with various underlying conditions, including substance use, migraine, epilepsy, head trauma, and encephalitis. Regardless of an individual's disease diagnosis, tachysensia is often included as a symptom associated with Alice in Wonderland Syndrome since it is classified as a perceptual distortion. Therefore, a person can be described as having Alice in Wonderland syndrome even if that person is experiencing tachysensia due to an underlying condition. [23]

Causes

Because AlWS is not commonly diagnosed and documented, it is difficult to estimate what the main causes are. The cause of over half of the documented cases of Alice in Wonderland syndrome is unknown. [24] Complete and partial forms of the AIWS exist in a range of other disorders, including epilepsy, intoxicants, infectious states, fevers, and brain lesions. [11] [25] Furthermore, the syndrome is commonly associated with migraines, as well as excessive screen use in dark spaces and the use of psychoactive drugs. It can also be the initial symptom of the Epstein–Barr virus (see mononucleosis), and a relationship between the syndrome and mononucleosis has been suggested. [4] [26] [27] [10] Within this suggested relationship, Epstein–Barr virus appears to be the most common cause in children, while for adults it is more commonly associated with migraines. [28]

Infectious diseases

A 2021 review found that infectious diseases are the most common cause of Alice in Wonderland syndrome, especially in pediatrics. Some of these infectious agents included Epstein–Barr virus, Varicella Zoster virus, Influenza, Zika, [29] Coxsackievirus, Plasmodium falciparum protozoa, and Mycoplasma pneumonia/Streptococcus pyogenes bacteria. [9] The Association of Alice in Wonderland syndrome is most commonly seen with the Epstein-Barr virus. However, pathogenesis is not well understood beyond these reviews. In some instances, Alice in Wonderland syndrome was reported to be associated with an Influenza A infection. [30] [31]

Cerebral hypotheses

Alice in Wonderland syndrome can be caused by abnormal amounts of electrical activity resulting in abnormal blood flow in the parts of the brain that process visual perception and texture. [5] Nuclear medical techniques using technetium, performed on individuals during episodes of Alice in Wonderland syndrome, have demonstrated that Alice in Wonderland Syndrome is associated with reduced cerebral perfusion in various cortical regions (frontal, parietal, temporal and occipital), both in combination and in isolation. One hypothesis is that any condition resulting in a decrease in perfusion of the visual pathways or visual control centers of the brain may be responsible for the syndrome. For example, one study used single photon emission computed tomography to demonstrate reduced cerebral perfusion in the temporal lobe in people with Alice in Wonderland syndrome. [32]

Other theories suggest the syndrome is a result of non-specific cortical dysfunction (e.g. from encephalitis, epilepsy, decreased cerebral blood flow), or reduced blood flow to other areas of the brain. [11] [10] Other theories suggest that distorted body image perceptions stem from within the parietal lobe. This has been demonstrated by the production of body image disturbances through electrical stimulation of the posterior parietal cortex. Other researchers suggest that metamorphopsias, or visual distortions, may be a result of reduced perfusion of the non-dominant posterior parietal lobe during migraine episodes. [11]

Throughout all the neuroimaging studies, several cortical regions (including the temporoparietal junction within the parietal lobe, and the visual pathway, specifically the occipital lobe) are associated with the development of Alice in Wonderland syndrome symptoms.[1]

Migraines

1 in 10 people who experience migraines have symptoms of Alice in Wonderland syndrome. [33] The role of migraines in Alice in Wonderland syndrome is still not understood, but both vascular and electrical theories have been suggested. For example, visual distortions may be a result of transient, localized ischemia in areas of the visual pathway during migraine attacks. In addition, a spreading wave of depolarization of cells (particularly glial cells) in the cerebral cortex during migraine attacks can eventually activate the trigeminal nerve's regulation of the vascular system. The intense cranial pain during migraines is due to the connection of the trigeminal nerve with the thalamus and thalamic projections onto the sensory cortex. Alice in Wonderland syndrome symptoms can precede, accompany, or replace the typical migraine symptoms. [11] Typical migraines (aura, visual derangements, hemicrania headache, nausea, and vomiting) are both a cause and an associated symptom of Alice in Wonderland Syndrome. [13] Alice in Wonderland Syndrome is associated with macrosomatognosia which can mostly be experienced during migraine auras. [34]

Genetic and environmental influence

While there currently is no identified genetic locus/loci associated with Alice in Wonderland syndrome, observations suggest that a genetic component may exist but the evidence so far is inconclusive. There is also an established genetic component for migraines which may be considered to be a possible cause and influence for hereditary Alice in Wonderland syndrome. Though most frequently described in children and adolescents, observational studies have found that many parents of children experiencing Alice in Wonderland syndrome have also experienced similar symptoms themselves, though often unrecognized. [24] Family history may then be a potential risk factor for Alice in Wonderland syndrome.

One example of environmental influences on the incidence of Alice in Wonderland syndrome includes the drug use and toxicity of topiramate. [35] Other reports of tyramine usage and the association with Alice in Wonderland syndrome has been reported but current evidence is inconclusive. Further research is required to establish the genetic and environmental influences on Alice in Wonderland syndrome. [10]

The neuronal effect of cortical spreading depression (CSD) on TPO-C may demonstrate the link between migraines and Alice in Wonderland Syndrome. As children experience Alice in Wonderland Syndrome more than adults, it is hypothesized that structural differences in the brain between children and adults may play a role in the development of this syndrome. [28] [36]

Diagnosis

Alice in Wonderland syndrome is not part of any major classifications like the ICD-10 [37] and the DSM-5. [38] Since there are no established diagnostic criteria for Alice in Wonderland syndrome, and because Alice in Wonderland syndrome is a disturbance of perception rather than a specific physiological condition, there is likely to be a large degree of variability in the diagnostic process and thus it can be poorly diagnosed. [28] Often, the diagnosis can be presumed when other causes have been ruled out. Additionally, Alice in Wonderland syndrome can be presumed if the patient presents symptoms along with migraines and complains of onset during the day (although it can also occur at night). Ideally, a definite diagnosis requires a thorough physical examination, proper history taking from episodes and occurrences, and a concrete understanding of the signs and symptoms of Alice in Wonderland syndrome for differential diagnosis. A person experiencing Alice in Wonderland syndrome may be reluctant to describe their symptoms out of fear of being labeled with a psychiatric disorder, which can contribute to the difficulty in diagnosing Alice in Wonderland syndrome. In addition, younger individuals may struggle to describe their unusual symptoms, and thus, one recommended approach is to encourage children to draw their visual illusions during episodes. [11] Cases that are suspected should warrant tests and exams such as blood tests, ECG, brain MRI, and other antibody tests for viral antibody detection. [13] Differential diagnosis requires three levels of conceptualization. Symptoms need to be distinguished from other disorders that involve hallucinations and illusions. It is usually easy to rule out psychosis as those with Alice in Wonderland syndrome are typically aware that their hallucinations and distorted perceptions are not 'real'. [10] Once these symptoms are distinguished and identified, the most likely cause needs to be established. Finally, the diagnosed condition needs to be evaluated to see if the condition is responsible for the symptoms that the individual is presenting. [12] Given the wide variety of metamorphopsias and other distortions, it is not uncommon for Alice in Wonderland syndrome to be misdiagnosed or confused with other etiologies.

Anatomical relation

An area of the brain that is important to the development of Alice in Wonderland syndrome is the temporal-parietal-occipital carrefour (TPO-C), [28] [39] where TPO-C region is the meeting point of temporooccipital, parietooccipital, and temporoparietal junctions in the brain. The TPO-C region is also crucial as it is the location where somatosensory and visual information are interpreted by the brain to generate any internal or external manifestations. Thus, modifications to these regions of the brain may trigger the cause of Alice in Wonderland Syndrome and body schema disorders simultaneously . [28]

Depending on which portion of the brain is damaged, the symptoms of Alice in Wonderland syndrome may differ. For example, it has been reported that injury to the anterior portion of the brain is more likely to be correlated to more complex and a wider range of symptoms, whereas damage to the occipital region has mainly been associated with only simple visual disturbances. [28]

Prognosis

The symptoms of Alice in Wonderland syndrome themselves are not physically harmful for the experiencer. Since there is no established treatment for Alice in Wonderland syndrome, prognosis varies between patients and is based on whether an underlying cause has been identified. [24] In many cases, the intensity of the episodes and symptoms decline. Since it is predominately a benign and non-harmful condition, treatment isn't always required. Limitations of the prognosis of Alice in Wonderland syndrome are due to the rarity of having the disorder. Due to the rarity, symptoms must be closely evaluated and observed by a professional [12]

Some cases include reoccurring symptoms in which other medical conditions have to be ruled out before diagnosing AIWS [12] If Alice in Wonderland Syndrome is caused by underlying conditions, symptoms typically occur during the underlying disease and can last from few days to months. [10] In most cases, symptoms may disappear either spontaneously, with the treatment of underlying causes, or after reassurances that symptoms are momentary and harmless. [12] In some cases it is experienced no more than a few episodes of symptoms, in other cases, symptoms may repeat several episodes before resolve. In rare cases, symptoms continue to manifest years after the initial experience, sometimes with the development of new visual disorders or migraines. [24] These manifestations and distortions is why medication is then introduced but have some inducing effects. [12]

Treatment

At present (2024), Alice in Wonderland Syndrome has no standardized treatment plan. [40] Tests including eectroencephalogram (EEG) and magnetic resonance imaging (MRI) are used to view brain activity to examine possible brain injury or deficits. [41] Since symptoms of Alice in Wonderland syndrome often disappear, either spontaneously on their own, or with the treatment of the underlying disease, most clinical and non-clinical Alice in Wonderland Syndrome cases are considered to be benign. In cases of Alice in Wonderland syndrome caused by underlying chronic disease, however, symptoms tend to reappear during the active phase of the underlying cause (e.g., migraine, epilepsy). If treatment of Alice in Wonderland Syndrome is determined necessary and useful, it should be focused on treating the suspected underlying disease. Treatment of these underlying conditions mostly involves prescription medications such as antiepileptics, migraine prophylaxis, antivirals, or antibiotics. Antipsychotics are rarely used in treating Alice in Wonderland Syndrome symptoms due to their minimal effectiveness. [12] There are also rare cases in which these prescription medications ,specifically antipsychotics, may worsen psychosis and psychotic symptoms due to the severity of distortions. [12]

In 2011, a patient was examined for having verbal auditory hallucinations (VAHs) and functional MRI (fMRI) was employed to localize cerebral activity during self-reported VAHs. Repetitive transcranial magnetic stimulation (rTSMS) was used on the patient's Brodmann's area 40, in charge of meaning and phonology, at a frequency of 1 Hz at T3P3. After the second week of treatment, all VAHs and sensory distortions have no effected on the patient and went through a full remission. Follow up appointments were conducted with no signs of any symptoms. By month 8, the symptoms returned. A second treatment was done with complete remission. [42]

Migraine prophylaxis

Treatment methods revolving around migraine prophylaxis include medications and following a low-tyramine diet. Drugs that may be used to prevent migraines include anticonvulsants, antidepressants, calcium channel blockers, and beta blockers. Other treatments that have been explored for migraines include repetitive transcranial magnetic stimulation (rTMS). However, further research is needed to establish the effectiveness of this treatment regime. [10]

Epidemiology

The lack of established diagnostic criteria or large-scale epidemiological studies, low awareness of the syndrome, and the unstandardized diagnosis criteria and definition for Alice in Wonderland syndrome mean that the exact prevalence of the syndrome is currently unknown. One study on 3,224 adolescents in Japan demonstrated the occurrence of macropsia and micropsia to be 6.5% in boys and 7.3% in girls, suggesting that the symptoms of Alice in Wonderland syndrome may not be particularly rare. [43] This also seems to suggest a difference in the male-to-female ratio of people with Alice in Wonderland syndrome. However, according to other studies, it appears that the male/female ratio is dependent on the age range being observed. Studies showed that younger males (age range of 5 to 14 years) were 2.69 times more likely to experience Alice in Wonderland syndrome than girls of the same age, while there were no significant differences between students of 13 to 15 years of age. Conversely, female students (16- to 18-year-olds) showed a significantly greater prevalence. [28]

Alice in Wonderland syndrome is more frequently seen in children and young adults. [36] The average age of the start of Alice in Wonderland syndrome is six years old, but it is typical for some people to experience the syndrome from childhood up to their late twenties. [10] Because many parents who have Alice in Wonderland syndrome report their children having it as well, the condition is thought possibly to be hereditary. [13] Some parents report not realizing they have experienced Alice in Wonderland syndrome symptoms until after their children have been diagnosed, further indicating that many cases of Alice in Wonderland syndrome likely go unrecognized and under-reported. [24]

Research is still being expanded upon and developed on this syndrome in a multitude of different regions and specialties. [44] Future studies are encouraged to include global collaborative efforts that may help improve understanding of Alice in Wonderland syndrome and its epidemiology.

History

The syndrome is sometimes called Todd's syndrome, about a description of the condition in 1955 by Dr. John Todd (1914–1987), a British consultant psychiatrist at High Royds Hospital at Menston in West Yorkshire. [45] [46] Dr. Todd discovered that several of his patients experienced severe headaches causing them to see and perceive objects as greatly out of proportion. In addition, they had altered sense of time and touch, as well as distorted perceptions of their own body. Despite having migraine headaches, none of these patients had brain tumors, damaged eyesight, or mental illness that could have accounted for these and similar symptoms. They were all able to think lucidly and could distinguish hallucinations from reality, however, their perceptions were distorted. [47]

Dr. Todd speculated that author Lewis Carroll had used his own migraine experiences as a source of inspiration for his famous 1865 novel Alice's Adventures in Wonderland . Carroll's diary reveals that, in 1856, he consulted William Bowman, an ophthalmologist, about the visual manifestations of the migraines he regularly experienced. [48] In Carroll's diaries, he often wrote of a "bilious headache" that came coupled with severe nausea and vomiting. In 1885, he wrote that he had "experienced, for the second time, that odd optical affection of seeing moving fortifications, followed by a headache". [49] Carroll wrote two books about Alice, the heroine after which the syndrome is named. In the story, Alice experiences several strange feelings that overlap with the characteristics of the syndrome, such as slowing time perception. In chapter two of Alice's Adventures in Wonderland (1865), Alice's body shrinks after drinking from a bottle labeled "DRINK ME", after which she consumed a cake that made her so large that she almost touched the ceiling. [50] These features of the story describes the macropsia and micropsia that are so characteristic to this disease.

These symptoms have been reported before in scientific literature, including World War I and II soldiers with occipital lesions, so Todd understood that he was not the first person to discover this phenomenon. Additionally, as early as 1933, other researchers such as Coleman and Lippman had compared these symptoms to the story of Alice in Wonderland. Caro Lippman was the first to hypothesize that the bodily changes that Alice encounters mimicked those of Lewis Carroll's migraine symptoms. Others suggest that Carroll may have familiarized himself with these distorted perceptions through his knowledge of hallucinogenic mushrooms. [12] It has been suggested that Carroll would have been aware of mycologist Mordecai Cubitt Cooke's description of the intoxicating effects of the fungus Amanita muscaria (commonly known as the fly agaric or fly amanita), in his books The Seven Sisters of Sleep and A Plain and Easy Account of British Fungi. [51] [52]

Notable cases

Society and culture

Gulliver's Travels

Alice in Wonderland syndrome's symptom of micropsia has also been related to Jonathan Swift's novel Gulliver's Travels . It has been referred to as "Lilliput sight" and "Lilliputian hallucination", a term coined by British physician Raoul Leroy in 1909. [54]

Alice in Wonderland

Alice in Wonderland syndrome was named after Lewis Carroll's 19th-century novel Alice's Adventures in Wonderland . In the story, Alice, the titular character, experiences numerous situations similar to those of micropsia and macropsia. The thorough descriptions of metamorphosis clearly described in the novel were the first of their kind to depict the bodily distortions associated with the condition. There is some speculation that Carroll may have written the story using his own direct experience with episodes of micropsia resulting from the numerous migraines he was known to experience. [48] It has also been suggested that Carroll may have had temporal lobe epilepsy. [55]

House

The condition is diagnosed in the season 8 episode "Risky Business".

Secret Garden

In episode ten of Secret Garden (2010, Korean drama), the leading man, Kim Joo Won, suspects that he is suffering from Alice in Wonderland syndrome.

Doctors

In April 2020, a case of Alice in Wonderland syndrome was covered in an episode of the BBC daytime soap opera Doctors , when patient Hazel Gilmore (Alex Jarrett) experienced it. [56]

See also

Related Research Articles

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Migraine is a genetically influenced complex neurological disorder characterized by episodes of moderate-to-severe headache, most often unilateral and generally associated with nausea and light and sound sensitivity. Other characterizing symptoms may include vomiting, cognitive dysfunction, allodynia, and dizziness. Exacerbation of headache symptoms during physical activity is another distinguishing feature. Up to one-third of migraine sufferers experience aura, a premonitory period of sensory disturbance widely accepted to be caused by cortical spreading depression at the onset of a migraine attack. Although primarily considered to be a headache disorder, migraine is highly heterogenous in its clinical presentation and is better thought of as a spectrum disease rather than a distinct clinical entity. Disease burden can range from episodic discrete attacks, consisting of as little as several lifetime attacks, to chronic disease.

<span class="mw-page-title-main">Hallucination</span> Perception that only seems real

A hallucination is a perception in the absence of an external stimulus that has the compelling sense of reality. Hallucinations are vivid, substantial, and are perceived to be located in external objective space. Hallucination is a combination of two conscious states of brain wakefulness and REM sleep. They are distinguishable from several related phenomena, such as dreaming, which does not involve wakefulness; pseudohallucination, which does not mimic real perception, and is accurately perceived as unreal; illusion, which involves distorted or misinterpreted real perception; and mental imagery, which does not mimic real perception, and is under voluntary control. Hallucinations also differ from "delusional perceptions", in which a correctly sensed and interpreted stimulus is given some additional significance.

<span class="mw-page-title-main">Headache</span> Pain in the head, neck, or face

Headache, also known as cephalalgia, is the symptom of pain in the face, head, or neck. It can occur as a migraine, tension-type headache, or cluster headache. There is an increased risk of depression in those with severe headaches.

<span class="mw-page-title-main">Micropsia</span> Medical condition

Micropsia is a condition affecting human visual perception in which objects are perceived to be smaller than they actually are. Micropsia can be caused by optical factors, by distortion of images in the eye, by changes in the brain, and from psychological factors. Dissociative phenomena are linked with micropsia, which may be the result of brain-lateralization disturbance.

Macropsia is a neurological condition affecting human visual perception, in which objects within an affected section of the visual field appear larger than normal, causing the person to feel smaller than they actually are. Macropsia, along with its opposite condition, micropsia, can be categorized under dysmetropsia. Macropsia is related to other conditions dealing with visual perception, such as aniseikonia and Alice in Wonderland Syndrome. Macropsia has a wide range of causes, from prescription and illicit drugs, to migraines and (rarely) complex partial epilepsy, and to different retinal conditions, such as epiretinal membrane. Physiologically, retinal macropsia results from the compression of cones in the eye. It is the compression of receptor distribution that results in greater stimulation and thus a larger perceived image of an object.

Exploding head syndrome (EHS) is an abnormal sensory perception during sleep in which a person experiences auditory hallucinations that are loud and of short duration when falling asleep or waking up. The noise may be frightening, typically occurs only occasionally, and is not a serious health concern. People may also experience a flash of light. Pain is typically absent.

<span class="mw-page-title-main">Visual snow syndrome</span> Visual impairment

Visual snow syndrome (VSS) is an uncommon neurological condition in which the primary symptom is that affected individuals see persistent flickering white, black, transparent, or coloured dots across the whole visual field.

<span class="mw-page-title-main">Hallucinogen persisting perception disorder</span> Medical condition

Hallucinogen persisting perception disorder (HPPD) is a non-psychotic disorder in which a person experiences apparent lasting or persistent visual hallucinations or perceptual distortions after using drugs, including but not limited to psychedelics, dissociatives, entactogens, tetrahydrocannabinol (THC), and SSRIs. Despite being designated as a hallucinogen-specific disorder, the specific contributory role of psychedelic drugs is unknown.

Palinopsia is the persistent recurrence of a visual image after the stimulus has been removed. Palinopsia is not a diagnosis; it is a diverse group of pathological visual symptoms with a wide variety of causes. Visual perseveration is synonymous with palinopsia.

<span class="mw-page-title-main">Aura (symptom)</span> Symptom of epilepsy and migraine

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<span class="mw-page-title-main">Phantom eye syndrome</span> Medical condition

Phantom eye syndrome (PES) is a phantom pain in the eye and visual hallucinations after the removal of an eye.

Phantosmia, also called an olfactory hallucination or a phantom odor, is smelling an odor that is not actually there. This is intrinsically suspicious as the formal evaluation and detection of relatively low levels of odour particles is itself a very tricky task in air epistemology. It can occur in one nostril or both. Unpleasant phantosmia, cacosmia, is more common and is often described as smelling something that is burned, foul, spoiled, or rotten. Experiencing occasional phantom smells is normal and usually goes away on its own in time. When hallucinations of this type do not seem to go away or when they keep coming back, it can be very upsetting and can disrupt an individual's quality of life.

Musical ear syndrome (MES) describes a condition seen in people who have hearing loss and subsequently develop auditory hallucinations. "MES" has also been associated with musical hallucinations, which is a complex form of auditory hallucinations where an individual may experience music or sounds that are heard without an external source. It is comparable to Charles Bonnet syndrome and some have suggested this phenomenon could be included under this diagnosis.

Derealization is an alteration in the perception of the external world, causing those with the condition to perceive it as unreal, distant, distorted or falsified. Other symptoms include feeling as if one's environment is lacking in spontaneity, emotional coloring, and depth. It is a dissociative symptom that may appear in moments of severe stress.

Migralepsy is a rare condition in which a migraine is followed, within an hour period, by an epileptic seizure. Because of the similarities in signs, symptoms, and treatments of both conditions, such as the neurological basis, the psychological issues, and the autonomic distress that is created from them, they individually increase the likelihood of causing the other. However, also because of the sameness, they are often misdiagnosed for each other, as migralepsy rarely occurs.

<span class="mw-page-title-main">Tactile hallucination</span> Hallucination involving perception of tactile input

Tactile hallucination is the false perception of tactile sensory input that creates a hallucinatory sensation of physical contact with an imaginary object. It is caused by the faulty integration of the tactile sensory neural signals generated in the spinal cord and the thalamus and sent to the primary somatosensory cortex (SI) and secondary somatosensory cortex (SII). Tactile hallucinations are recurrent symptoms of neurological diseases such as schizophrenia, Parkinson's disease, Ekbom's syndrome and delirium tremens. Patients who experience phantom limb pains also experience a type of tactile hallucination. Tactile hallucinations are also caused by drugs such as cocaine and alcohol.

<span class="mw-page-title-main">Illusory palinopsia</span> Subtype of palinopsia

Illusory palinopsia is a subtype of palinopsia, a visual disturbance defined as the persistence or recurrence of a visual image after the stimulus has been removed. Palinopsia is a broad term describing a heterogeneous group of symptoms, which is divided into hallucinatory palinopsia and illusory palinopsia. Illusory palinopsia is likely due to sustained awareness of a stimulus and is similar to a visual illusion: the distorted perception of a real external stimulus.

Prosopometamorphopsia is a visual disorder characterized by altered perceptions of faces. In the perception of a person with the disorder, facial features are distorted in a variety of ways including drooping, swelling, discoloration, and shifts of position. Prosopometamorphopsia is distinct from prosopagnosia, which is characterised by the inability to recognise faces. About 75 cases of prosopometamorphopsia have been reported in the scientific literature. In about half of the reported cases, features on both sides of the face appear distorted. In the other half of cases, distortions are restricted to one side of the face and this condition is called hemi-prosopometamorphopsia.

<span class="mw-page-title-main">Occipital epilepsy</span> Medical condition

Occipital epilepsy is a neurological disorder that arises from excessive neural activity in the occipital lobe of the brain that may or may not be symptomatic. Occipital lobe epilepsy is fairly rare, and may sometimes be misdiagnosed as migraine when symptomatic. Epileptic seizures are the result of synchronized neural activity that is excessive, and may stem from a failure of inhibitory neurons to regulate properly.

References

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