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Sheldon AD, Kafadar E, Fisher V, Greenwald MS, Aitken F, Negreira AM, Woods SW, Powers AR. Perceptual pathways to hallucinogenesis. Schizophr Res 2022; 245:77-89. [PMID: 35216865 PMCID: PMC9232894 DOI: 10.1016/j.schres.2022.02.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 01/31/2022] [Accepted: 02/02/2022] [Indexed: 12/22/2022]
Abstract
Recent advances in computational psychiatry have provided unique insights into the neural and cognitive underpinnings of psychotic symptoms. In particular, a host of new data has demonstrated the utility of computational frameworks for understanding how hallucinations might arise from alterations in typical perceptual processing. Of particular promise are models based in Bayesian inference that link hallucinatory perceptual experiences to latent states that may drive them. In this piece, we move beyond these findings to ask: how and why do these latent states arise, and how might we take advantage of heterogeneity in that process to develop precision approaches to the treatment of hallucinations? We leverage specific models of Bayesian inference to discuss components that might lead to the development of hallucinations. Using the unifying power of our model, we attempt to place disparate findings in the study of psychotic symptoms within a common framework. Finally, we suggest directions for future elaboration of these models in the service of a more refined psychiatric nosology based on predictable, testable, and ultimately treatable information processing derangements.
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Affiliation(s)
- Andrew D Sheldon
- Yale University School of Medicine and the Connecticut Mental Health Center, New Haven, CT, United States of America
| | - Eren Kafadar
- Yale University School of Medicine and the Connecticut Mental Health Center, New Haven, CT, United States of America
| | - Victoria Fisher
- Yale University School of Medicine and the Connecticut Mental Health Center, New Haven, CT, United States of America
| | - Maximillian S Greenwald
- Yale University School of Medicine and the Connecticut Mental Health Center, New Haven, CT, United States of America
| | - Fraser Aitken
- School of Biomedical and Imaging Sciences, Kings College, London, UK
| | | | - Scott W Woods
- Yale University School of Medicine and the Connecticut Mental Health Center, New Haven, CT, United States of America
| | - Albert R Powers
- Yale University School of Medicine and the Connecticut Mental Health Center, New Haven, CT, United States of America.
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Badcock JC, Larøi F, Kamp K, Kelsall-Foreman I, Bucks RS, Weinborn M, Begemann M, Taylor JP, Collerton D, O’Brien JT, El Haj M, Ffytche D, Sommer IE. Hallucinations in Older Adults: A Practical Review. Schizophr Bull 2020; 46:1382-1395. [PMID: 32638012 PMCID: PMC7707075 DOI: 10.1093/schbul/sbaa073] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
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 individuals are often under-recognized. They are also commonly misunderstood by service providers, suggesting that there is significant scope for improvement in the training and practice of professionals working with this age group. The aim of the present article is to increase knowledge about hallucinations in older adults and provide a practical resource for the health and aged-care workforce. Specifically, we provide a concise narrative review and critique of (1) workforce competency and training issues, (2) assessment tools, and (3) current treatments and management guidelines. We conclude with a brief summary including suggestions for service and training providers and future research.
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Affiliation(s)
- Johanna C Badcock
- School of Psychological Science, University of Western Australia, Perth, Australia
- Perth Voices Clinic, Murdoch, Australia
- To whom correspondence should be addressed; School of Psychological Science, The University of Western Australia, 35 Stirling Highway, Perth, 6009; tel: 0423123665, fax: 61864881006, e-mail:
| | - Frank Larøi
- Department of Biological and Medical Psychology, University of Bergen, Bergen, Norway
- Psychology and Neuroscience of Cognition Research Unit, University of Liege, Liege, Belgium
- Norwegian Centre of Excellence for Mental Disorders Research, University of Oslo, Oslo, Norway
| | - Karina Kamp
- Department of Psychology and Behavioural Science, Aarhus University, Aarhus C, Denmark
| | | | - Romola S Bucks
- School of Psychological Science, University of Western Australia, Perth, Australia
| | - Michael Weinborn
- School of Psychological Science, University of Western Australia, Perth, Australia
| | - Marieke Begemann
- Department of Biomedical Sciences of Cells and Systems, University Medical Center, Rijks Universiteit Groningen (RUG), Groningen, The Netherlands
| | - John-Paul Taylor
- Institute of Neuroscience, Newcastle University, Newcastle upon Tyne, UK
| | - Daniel Collerton
- Institute of Neuroscience, Newcastle University, Newcastle upon Tyne, UK
| | - John T O’Brien
- Department of Psychiatry, University of Cambridge, Cambridge, UK
| | - Mohamad El Haj
- Laboratoire de Psychologie des Pays de la Loire (LPPL-EA 4638), Nantes Université, Univ Angers, Nantes, France
| | - Dominic Ffytche
- Department of Old Age Psychiatry, Institute of Psychiatry, Psychology and Neuroscience, King’s College, London, UK
| | - Iris E Sommer
- Rijks Universiteit Groningen (RUG), Department of Biomedical Sciences of Cells and Systems, University Medical Center Groningen, The Netherlands
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