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Hallucinations in medical conditions
Research Guide
What is Hallucinations in medical conditions?
Hallucinations in medical conditions are perceptual experiences without corresponding external stimuli, occurring in syndromes such as Charles Bonnet Syndrome, musical hallucinosis, and auditory hallucinations, often linked to visual impairment, retinal diseases, Parkinson's disease, and schizophrenia.
This field examines visual hallucinatory syndromes including Charles Bonnet Syndrome and musical hallucinosis alongside auditory hallucinations in contexts of visual impairment and retinal diseases, with 14,600 papers published. Research covers neural basis, brain substrate, clinical spectrum, prevalence, phenomenology, and treatment options for these hallucinations. Growth rate over the past five years is not available in the data.
Topic Hierarchy
Research Sub-Topics
Charles Bonnet Syndrome
Charles Bonnet Syndrome involves complex visual hallucinations in visually impaired individuals without cognitive deficits, linked to retinal diseases. Researchers study prevalence, phenomenological characteristics, and deafferentation mechanisms in the visual cortex.
Musical Hallucinosis
Musical hallucinosis features spontaneous auditory perceptions of music, often in hearing-impaired elderly or neurological patients. Studies explore temporal lobe involvement, triggers like sensory loss, and neuroimaging correlates.
Visual Hallucinations in Parkinson's Disease
Visual hallucinations in Parkinson's disease are prevalent, multifaceted symptoms influenced by dopaminergic therapy and Lewy body pathology. Research examines risk factors, phenomenology, and neural substrates using fMRI and clinical trials.
Neural Basis of Hallucinations
The neural basis of hallucinations involves aberrant activity in sensory cortices and salience networks, studied via neuroimaging in various syndromes. Researchers investigate top-down perceptual priors and inhibitory failures in schizophrenia-like models.
Auditory Hallucinations
Auditory hallucinations, often voices, arise from hyperactivity in auditory cortex like Heschl's gyrus, examined in schizophrenia and sensory loss contexts. Studies focus on EEG correlates, voice perception, and pharmacological interventions.
Why It Matters
Hallucinations in medical conditions affect clinical management in Parkinson's disease, where visual hallucinations occur in about one-quarter of patients, as shown in "Hallucinations in Parkinson's disease: Prevalence, phenomenology and risk factors" (Fénelon, 2000), influencing antiparkinsonian treatment decisions. In schizophrenia, reductions in left posterior superior temporal gyrus volume correlate with thought disorder severity, per "Abnormalities of the Left Temporal Lobe and Thought Disorder in Schizophrenia" (Shenton et al., 1992), aiding neuroimaging-based diagnosis. Auditory hallucinations activate Heschl’s gyrus, as demonstrated by "Activation of Heschl’s Gyrus during Auditory Hallucinations" (Dierks et al., 1999), supporting targeted rehabilitation in sensory-impaired patients.
Reading Guide
Where to Start
"Hallucinations in Parkinson's disease: Prevalence, phenomenology and risk factors" (Fénelon, 2000) provides an accessible entry with clear prevalence data (one-quarter of patients) and phenomenology, ideal for understanding clinical context before neural studies.
Key Papers Explained
"Selective Attention Gates Visual Processing in the Extrastriate Cortex" (Moran and Desimone, 1985) establishes attention's role in visual cortex gating, foundational for later works like "Activation of Heschl’s Gyrus during Auditory Hallucinations" (Dierks et al., 1999), which shows parallel activation in auditory hallucinations, and "Hallucinations in Parkinson's disease: Prevalence, phenomenology and risk factors" (Fénelon, 2000), applying phenomenology to clinical syndromes; "Abnormalities of the Left Temporal Lobe and Thought Disorder in Schizophrenia" (Shenton et al., 1992) connects temporal lobe volume to disorders overlapping with hallucinatory experiences.
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Research emphasizes neural basis via neuroimaging in visual and auditory domains, with no recent preprints or news in the last 12 months indicating steady focus on established substrates like Heschl’s gyrus and extrastriate cortex from classics such as Dierks et al. (1999) and Moran and Desimone (1985).
Papers at a Glance
| # | Paper | Year | Venue | Citations | Open Access |
|---|---|---|---|---|---|
| 1 | Selective Attention Gates Visual Processing in the Extrastriat... | 1985 | Science | 2.5K | ✕ |
| 2 | Selective Attention Gates Visual Processing in the Extrastriat... | 2003 | The MIT Press eBooks | 2.2K | ✕ |
| 3 | Abnormalities of the Left Temporal Lobe and Thought Disorder i... | 1992 | New England Journal of... | 1.2K | ✓ |
| 4 | Hallucinations in Parkinson's disease: Prevalence, phenomenolo... | 2000 | Brain | 1.0K | ✕ |
| 5 | Stimulating illusory own-body perceptions | 2002 | Nature | 790 | ✓ |
| 6 | Activation of Heschl’s Gyrus during Auditory Hallucinations | 1999 | Neuron | 752 | ✓ |
| 7 | Out‐of‐body experience and autoscopy of neurological origin | 2004 | Brain | 731 | ✓ |
| 8 | When Far Becomes Near: Remapping of Space by Tool Use | 2000 | Journal of Cognitive N... | 728 | ✕ |
| 9 | Pavlovian conditioning–induced hallucinations result from over... | 2017 | Science | 715 | ✕ |
| 10 | Touched with fire: manic-depressive illness and the artistic t... | 1993 | Choice Reviews Online | 708 | ✕ |
Frequently Asked Questions
What is the prevalence of hallucinations in Parkinson's disease?
Visual hallucinations affect about one-quarter of Parkinson's disease patients. They are often linked to antiparkinsonian treatment but involve other factors. This comes from "Hallucinations in Parkinson's disease: Prevalence, phenomenology and risk factors" (Fénelon, 2000).
How does the left temporal lobe relate to hallucinations in schizophrenia?
Schizophrenia features localized gray matter reductions in the left temporal lobe. Thought disorder severity correlates with the volume reduction in the left posterior superior temporal gyrus. Findings are from "Abnormalities of the Left Temporal Lobe and Thought Disorder in Schizophrenia" (Shenton et al., 1992).
What brain region activates during auditory hallucinations?
Heschl’s gyrus activates during auditory hallucinations. This activation occurs in the primary auditory cortex. Evidence is provided by "Activation of Heschl’s Gyrus during Auditory Hallucinations" (Dierks et al., 1999).
What is Charles Bonnet Syndrome?
Charles Bonnet Syndrome involves visual hallucinations in visually impaired individuals. It arises from visual impairment and retinal diseases without primary psychiatric disorder. The field description notes its inclusion in visual hallucinatory syndromes.
How does selective attention influence visual processing related to hallucinations?
Selective attention gates visual processing in the extrastriate cortex. Cells in areas V4 and inferior temporal cortex respond more to attended stimuli within receptive fields. This is detailed in "Selective Attention Gates Visual Processing in the Extrastriate Cortex" (Moran and Desimone, 1985).
Open Research Questions
- ? What neural mechanisms link visual impairment in retinal diseases to Charles Bonnet Syndrome hallucinations?
- ? How do antiparkinsonian treatments interact with non-pharmacological risk factors for hallucinations in Parkinson's disease?
- ? What distinguishes brain activation patterns in auditory versus musical hallucinosis?
- ? Can Pavlovian conditioning models explain the transition from perceptual priors to hallucinations in healthy individuals?
Recent Trends
The field maintains 14,600 works with no specified five-year growth rate; high-citation classics like "Selective Attention Gates Visual Processing in the Extrastriate Cortex" (Moran and Desimone, 1985; 2455 citations) and its 2003 version (2198 citations) dominate, while no preprints or news from the last 12 months appear, suggesting consolidation around phenomenology in Parkinson's (Fénelon, 2000; 1028 citations) and schizophrenia (Shenton et al., 1992; 1177 citations).
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