Daniel Collerton
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View article: Visual Hallucinations in Serotonergic Psychedelics and Lewy Body Diseases
Visual Hallucinations in Serotonergic Psychedelics and Lewy Body Diseases Open
Background and HypothesisVisual hallucinations (VH) are a core symptom of both Lewy body diseases (LBDs; e.g., Parkinson’s disease and dementia with Lewy bodies) and serotonergic psychedelics (SPs; e.g., psilocybin and mescaline). While th…
View article: Visual Hallucinations in Serotonergic Psychedelics and Lewy Body Diseases
Visual Hallucinations in Serotonergic Psychedelics and Lewy Body Diseases Open
Background and Hypothesis Visual hallucinations (VH) are a core symptom of both Lewy body diseases (LBDs; eg, Parkinson’s disease and dementia with Lewy bodies) and serotonergic psychedelics (SPs; eg, psilocybin and mescaline). While these…
View article: Visual Hallucinations in Serotonergic Psychedelics and Lewy Body Diseases
Visual Hallucinations in Serotonergic Psychedelics and Lewy Body Diseases Open
Background and HypothesisVisual hallucinations (VH) are a core symptom of both Lewy body diseases (LBDs; e.g., Parkinson’s disease and dementia with Lewy bodies) and serotonergic psychedelics (SPs; e.g., psilocybin and mescaline). While th…
View article: Visual Hallucinations in Serotonergic Psychedelics and Lewy Body Diseases
Visual Hallucinations in Serotonergic Psychedelics and Lewy Body Diseases Open
Background and HypothesisVisual hallucinations (VH) are a core symptom of both Lewy body diseases (LBDs; e.g., Parkinson’s disease and dementia with Lewy bodies) and serotonergic psychedelics (SPs; e.g., psilocybin and mescaline). While th…
View article: Visual cortical activity in Charles Bonnet syndrome: testing the deafferentation hypothesis
Visual cortical activity in Charles Bonnet syndrome: testing the deafferentation hypothesis Open
Visual hallucinations in individuals following sight loss (Charles Bonnet syndrome; CBS) have been posited to arise because of spontaneous, compensatory, neural activity in the visual cortex following sensory input loss from the eyes—known…
View article: Episodic Visual Hallucinations, Inference and Free Energy
Episodic Visual Hallucinations, Inference and Free Energy Open
Understandings of how visual hallucinations appear have been highly influenced by generative approaches, in particular Friston’s Active Inference conceptualization. Their core proposition is that these phenomena occur when hallucinatory ex…
View article: Non-clinical hallucinations and mental imagery across sensory modalities
Non-clinical hallucinations and mental imagery across sensory modalities Open
Mental imagery may act as a modality general process increasing hallucination proneness. The observed distinction between self-report and performance-based imagery highlights the difficulty of accurately measuring internal processes.
View article: Functional connectivity in Lewy body disease with visual hallucinations
Functional connectivity in Lewy body disease with visual hallucinations Open
Background and purpose Visual hallucinations are a common, potentially distressing experience of people with Lewy body disease (LBD). The underlying brain changes giving rise to visual hallucinations are not fully understood, although prev…
View article: Transcranial Direct Current Stimulation in the Treatment of Visual Hallucinations in Charles Bonnet Syndrome
Transcranial Direct Current Stimulation in the Treatment of Visual Hallucinations in Charles Bonnet Syndrome Open
Findings indicate that inhibitory tDCS of visual cortex may reduce the frequency of visual hallucinations in people with CBS, particularly individuals who demonstrate greater occipital excitability prior to stimulation. tDCS may offer a fe…
View article: Functional and structural brain network correlates of visual hallucinations in Lewy body dementia
Functional and structural brain network correlates of visual hallucinations in Lewy body dementia Open
Visual hallucinations are a common feature of Lewy body dementia. Previous studies have shown that visual hallucinations are highly specific in differentiating Lewy body dementia from Alzheimer’s disease dementia and Alzheimer–Lewy body mi…
View article: Investigation of structural brain changes in Charles Bonnet Syndrome
Investigation of structural brain changes in Charles Bonnet Syndrome Open
Our findings suggest that although there are cortical and subcortical effects associated with sight loss, structural changes do not explain the occurrence of VHs. CBS may relate instead to connectivity or excitability changes in brain netw…
View article: Cognition, hallucination severity and hallucination-specific insight in neurodegenerative disorders and eye disease
Cognition, hallucination severity and hallucination-specific insight in neurodegenerative disorders and eye disease Open
Introduction: Hallucinations occur across neurodegenerative disorders, with increasing severity, poorer cognition and impaired hallucination-specific insight associated with worse outcomes and faster disease progression. It remains unclear…
View article: Exploring Bottom-Up Visual Processing and Visual Hallucinations in Parkinson's Disease With Dementia
Exploring Bottom-Up Visual Processing and Visual Hallucinations in Parkinson's Disease With Dementia Open
Visual hallucinations (VH) are a common symptom of Parkinson's disease with dementia (PDD), affecting up to 65% of cases. Integrative models of their etiology posit that a decline in executive control of the visuo-perceptual system is a pr…
View article: A Review of Multimodal Hallucinations: Categorization, Assessment, Theoretical Perspectives, and Clinical Recommendations
A Review of Multimodal Hallucinations: Categorization, Assessment, Theoretical Perspectives, and Clinical Recommendations Open
Hallucinations can occur in different sensory modalities, both simultaneously and serially in time. They have typically been studied in clinical populations as phenomena occurring in a single sensory modality. Hallucinatory experiences occ…
View article: Exploring Bottom-Up Visual Processing and Visual Hallucinations in Parkinson’s Disease with Dementia
Exploring Bottom-Up Visual Processing and Visual Hallucinations in Parkinson’s Disease with Dementia Open
Visual hallucinations (VH) are a common symptom of Parkinson’s disease with dementia (PDD), affecting up to 65% of cases. Integrative models of their etiology posit that a decline in executive control of the visuo-perceptual system is a pr…
View article: Hallucinations in Older Adults: A Practical Review
Hallucinations in Older Adults: A Practical Review Open
Older adults experience hallucinations in a variety of social, physical, and mental health contexts. Not everyone is open about these experiences, as hallucinations are surrounded with stigma. Hence, hallucinatory experiences in older indi…
View article: Visual hallucinations in neurological and ophthalmological disease: pathophysiology and management
Visual hallucinations in neurological and ophthalmological disease: pathophysiology and management Open
Visual hallucinations are common in older people and are especially associated with ophthalmological and neurological disorders, including dementia and Parkinson’s disease. Uncertainties remain whether there is a single underlying mechanis…
View article: A Review of Multimodal Hallucinations: Categorisation, Assessment, Theoretical Perspectives And Clinical Recommendations
A Review of Multimodal Hallucinations: Categorisation, Assessment, Theoretical Perspectives And Clinical Recommendations Open
Hallucinations can occur in different sensory modalities within an individual, both simultaneously and serially in time. Historically, they have typically been studied in clinical populations as phenomena occurring in a single sensory moda…
View article: The utility and application of electrophysiological methods in the study of visual hallucinations
The utility and application of electrophysiological methods in the study of visual hallucinations Open
Visual hallucinations (VH) are a common symptom in multiple clinical and non-clinical populations. Although structural and functional neuroimaging has informed the understanding of VH, temporal resolution is limited. Electrophysiological t…
View article: Reduced occipital GABA in Parkinson disease with visual hallucinations
Reduced occipital GABA in Parkinson disease with visual hallucinations Open
The data suggest that reduced levels of GABA are associated with visual hallucinations in PD and implicate changes to the ventral visual stream in the genesis of visual hallucinations. Modulation of visual cortical excitability through, fo…
View article: P4‐284: PRELIMINARY VALIDATION OF THE NORTH‐EAST VISUAL HALLUCINATION SCALE SEVERITY SCORE IN LEWY BODY DISEASES
P4‐284: PRELIMINARY VALIDATION OF THE NORTH‐EAST VISUAL HALLUCINATION SCALE SEVERITY SCORE IN LEWY BODY DISEASES Open
Visual hallucinations (VH) are a common symptom of Parkinson's disease (PD), Parkinson's disease dementia (PDD) and dementia with Lewy bodies (DLB) and other disorders. Several self-rated interviews (Queen Square Visual Hallucination Inven…
View article: Coping with Cognitive Impairment in People with Parkinson’s Disease and Their Carers: A Qualitative Study
Coping with Cognitive Impairment in People with Parkinson’s Disease and Their Carers: A Qualitative Study Open
Cognitive impairment is common in Parkinson’s disease (PD). However, the psychosocial impact of living and coping with PD and cognitive impairment in people with PD and their carers have not been explored. This paper draws on a qualitative…
View article: The Structure and Measurement of Unusual Sensory Experiences in Different Modalities: The Multi-Modality Unusual Sensory Experiences Questionnaire (MUSEQ)
The Structure and Measurement of Unusual Sensory Experiences in Different Modalities: The Multi-Modality Unusual Sensory Experiences Questionnaire (MUSEQ) Open
Hallucinations and other unusual sensory experiences (USE) can occur in all modalities in the general population. Yet, the existing literature is dominated by investigations into auditory hallucinations ("voices"), while other modalities r…
View article: Compensatory shifts in visual perception are associated with hallucinations in Lewy body disorders
Compensatory shifts in visual perception are associated with hallucinations in Lewy body disorders Open
Visual hallucinations are a common, distressing, and disabling symptom of Lewy body and other diseases. Current models suggest that interactions in internal cognitive processes generate hallucinations. However, these neglect external facto…
View article: Cognitive behavioural therapy for visual hallucinations: an investigation using a single-case experimental design
Cognitive behavioural therapy for visual hallucinations: an investigation using a single-case experimental design Open
There has been limited application of cognitive behavioural therapy (CBT) to the treatment of distressing visual hallucinations (VH) in people with psychosis. Preliminary research applying interventions to a novel presenting issue are enha…
View article: Cognitive impairment in Parkinson's disease: impact on quality of life of carers
Cognitive impairment in Parkinson's disease: impact on quality of life of carers Open
Background The quality of life (QoL) of informal caregivers of people with Parkinson's disease (PD) (PwP) can be affected by the caring role. Because of cognitive symptoms and diminished activities of daily living, in addition to the manag…
View article: What Is the Link Between Hallucinations, Dreams, and Hypnagogic–Hypnopompic Experiences?
What Is the Link Between Hallucinations, Dreams, and Hypnagogic–Hypnopompic Experiences? Open
By definition, hallucinations occur only in the full waking state. Yet similarities to sleep-related experiences such as hypnagogic and hypnopompic hallucinations, dreams and parasomnias, have been noted since antiquity. These observations…
View article: Cognitive decline and quality of life in incident Parkinson's disease: The role of attention
Cognitive decline and quality of life in incident Parkinson's disease: The role of attention Open
INTRODUCTION: Parkinson's disease dementia (PDD) is associated with poorer quality of life (QoL). Prior to the onset of PDD, many patients experience progressive cognitive impairment. There is a paucity of longitudinal studies investigatin…