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The Neuroscience of Visual Hallucinations Daniel Collerton

The Neuroscience of Visual Hallucinations By Daniel Collerton

The Neuroscience of Visual Hallucinations by Daniel Collerton

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Summary

Each year, some two million people in the United Kingdom experience visual hallucinations. Infrequent, fleeting visual hallucinations, often around sleep, are a usual feature of life.

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The Neuroscience of Visual Hallucinations Summary

The Neuroscience of Visual Hallucinations by Daniel Collerton

Each year, some two million people in the United Kingdom experience visual hallucinations. Infrequent, fleeting visual hallucinations, often around sleep, are a usual feature of life. In contrast, consistent, frequent, persistent hallucinations during waking are strongly associated with clinical disorders; in particular delirium, eye disease, psychosis, and dementia. Research interest in these disorders has driven a rapid expansion in investigatory techniques, new evidence, and explanatory models. In parallel, a move to generative models of normal visual function has resolved the theoretical tension between veridical and hallucinatory perceptions. From initial fragmented areas of investigation, the field has become increasingly coherent over the last decade. Controversies and gaps remain, but for the first time the shapes of possible unifying models are becoming clear, along with the techniques for testing these. This book provides a comprehensive survey of the neuroscience of visual hallucinations and the clinical techniques for testing these. It brings together the very latest evidence from cognitive neuropsychology, neuroimaging, neuropathology, and neuropharmacology, placing this within current models of visual perception. Leading researchers from a range of clinical and basic science areas describe visual hallucinations in their historical and scientific context, combining introductory information with up-to-date discoveries. They discuss results from the main investigatory techniques applied in a range of clinical disorders. The final section outlines future research directions investigating the potential for new understandings of veridical and hallucinatory perceptions, and for treatments of problematic hallucinations. Fully comprehensive, this is an essential reference for clinicians in the fields of the psychology and psychiatry of hallucinations, as well as for researchers in departments, research institutes and libraries. It has strong foundations in neuroscience, cognitive science, optometry, psychiatry, psychology, clinical medicine, and philosophy. With its lucid explanation and many illustrations, it is a clear resource for educators and advanced undergraduate and graduate students.

About Daniel Collerton

Daniel Collerton, Consultant Clinical Psychologist, Northumberland, Tyne and Wear NHS Foundation Trust, UK Elaine Perry, Institute of Ageing and Health, Newcastle University, UK Urs Peter Mosimann, University Hospital of Old Age Psychiatry, University of Bern, Switzerland

Table of Contents

List of contributors ix Foreword xi Section 1: Background and Context 1 1 Visual hallucinations: history and context of current research 3 G.E. Berrios and Ivana S. Markova 1.1 Introduction 3 1.2 The construction of visual hallucinations 5 1.3 Epistemology: dichotomies 11 1.4 Research and its vicissitudes 15 1.5 Bringing the history of visual hallucinations and research together 17 1.6 Conclusions 18 1.7 References 19 2 Defining and measuring hallucinations and their consequences what is really the difference between a veridical perception and a hallucination? Categories of hallucinatory experiences 23 Jan Dirk Blom 2.1 What every student knows 23 2.2 Suspended between realism and anti-realism 24 2.3 Faith 26 2.4 The philosophy of As If 28 2.5 Visual hallucinations 28 2.6 Visual illusions 30 2.7 Metamorphopsias (visual distortions) 34 2.8 Ways of measuring and quantifying positive disorders of vision 37 2.9 Concluding remarks 38 2.10 References 40 3 Hallucinatory aspects of normal vision 47 Geraint Rees 3.1 Introduction 47 3.2 Gregory s taxonomy 48 3.3 Blind spot and scotomas 49 3.4 After-images and after-effects 50 3.5 Perceptual ambiguity and multistable perception 51 3.6 Illusory contours and surfaces 52 3.7 Object perception and illusory vision 53 3.8 Conclusion 55 3.9 References 55 4 Non-pathological associations sleep and dreams, deprivation and bereavement 59 Armando D Agostino, Anna Castelnovo, and Silvio Scarone 4.1 Introduction 59 4.2 Visual hallucinations in the general population 60 4.3 Visual hallucinations during sleep and sleep/wake transitions 67 4.4 Trauma, grief and bereavement 74 4.5 Sensory deprivation 83 4.6 The Bayesian heuristic: a unifying model? 84 4.7 Conclusions: the psychosis continuum 85 4.8 References 86 5 The clinical associations of visual hallucinations 91 Marco Onofrj, Astrid Thomas, Giovanni Martinotti, Francesca Anzellotti, Massimo Di Giannantonio, Fausta Ciccocioppo, and Laura Bonanni 5.1 Introduction 91 5.2 Describing hallucinations 93 5.3 Visual hallucinations associated with visual loss 93 5.4 Visual hallucinations in acute vascular or neoplastic lesions 94 5.5 Visual hallucinations in neurodegenerative diseases 94 5.6 Visual hallucinations associated with dementia 99 5.7 Creutzfeldt-Jakob disease 101 5.8 Visual hallucinations in psychosis 102 5.9 Drug-induced hallucinations 104 5.10 Delirium 105 5.11 Epilepsy 105 5.12 Migraine 107 5.13 Inborn errors of metabolism 108 5.14 Commentary 108 5.15 References 110 Section 2: Investigations and Data 119 6 Hallucinogenic mechanisms: pathological and pharmacological insights 121 Simon J.G. Lewis, James M. Shine, Daniel Brooks, and Glenda M. Halliday 6.1 Introduction 121 6.2 Societal impact 122 6.3 Misperceptions and hallucinations 122 6.4 Pathological findings in clinical disorders with high levels of hallucinations 125 6.5 Role of neurotransmitters in hallucinations 130 6.6 A common neural mechanism 132 6.7 Conclusion 138 6.8 References 139 7 Imaging in visual hallucinations 151 Anne Marthe Meppelink 7.1 Introduction 151 7.2 Imaging the hallucinator 152 7.3 Imaging the hallucination 158 7.4 References 163 8 EEG and transcranial magnetic stimulation. Changing and recording the dynamic flow of visual perception 167 Nicholas Murphy, Sara Graziadio, and John-Paul Taylor 8.1 Introduction 167 8.2 Electroencephalography 168 8.3 Transcranial magnetic stimulation 179 8.4 Future directions for the study of visual hallucinations using neurophysiological approaches 184 8.5 References 186 9 Neuropsychological approaches to understanding visual hallucinations 193 Jim Barnes 9.1 Introduction 193 9.2 Perceptual impairments 195 9.3 Misidentifications of internal images 196 9.4 Executive function 199 9.5 Attention and vigilance 201 9.6 Questions and future directions 204 9.7 References 210 Section 3: Models and Theories 217 10 Geometric visual hallucinations and the structure of the visual cortex 219 Jack D. Cowan 10.1 Introduction 219 10.2 A new mathematical formulation of V1 circuitry 228 10.3 Conditions for the loss of stability of the homogeneous state 232 10.4 Extensions of the model 238 10.5 Summary and concluding remarks 248 10.6 References 250 11 Thalamic and brainstem regulatory systems why disturbances external to the visual system can cause hallucinations 255 Rene M. Muri 11.1 Introduction 255 11.2 Overview of the cases published with peduncular hallucinations 257 11.3 Aetiology and lesion localization contributing to peduncular hallucinations 269 11.4 Origin and mechanisms of peduncular hallucinations 270 11.5 References 275 12 The pathology of hallucinations: one or several points of processing breakdown? 281 Nico J. Diederich, Christopher G. Goetz, and Glenn T. Stebbins 12.1 Introduction 281 12.2 Requirements for an ideal model 282 12.3 Phenomenology a clue to pathogenesis? 282 12.4 Early unimodal models of pathogenesis 283 12.5 Neuropathological findings 287 12.6 Interactive, multifactorial models 290 12.7 Conclusions and outlook 299 12.8 References 301 Section 4: New Directions 307 13 Future directions for research 309 Daniel Collerton, Urs Peter Mosimann, and Elaine Perry 13.1 Introduction 309 13.2 References 318 14 The treatment of visual hallucinations at present and in the future 321 Elaine Perry, Urs Peter Mosimann, and Daniel Collerton 14.1 Introduction 321 14.2 Excluding drugs that induce visual hallucinations 323 14.3 Drug treatment of visual hallucinations 327 14.4 Psychological interventions 332 14.5 Unexplored issues and other potential therapies 334 14.6 References 336 Index 343

Additional information

CIN1118731700G
9781118731703
1118731700
The Neuroscience of Visual Hallucinations by Daniel Collerton
Daniel Collerton
Used - Good
Hardback
John Wiley & Sons Inc
20150213
368
N/A
Book picture is for illustrative purposes only, actual binding, cover or edition may vary.
This is a used book - there is no escaping the fact it has been read by someone else and it will show signs of wear and previous use. Overall we expect it to be in good condition, but if you are not entirely satisfied please get in touch with us

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