part brain hallucinations What causes hallucinations

What part of the brain causes hallucinations

The language examination should distinguish Wernicke aphasia from the language of delirium. Aphasics have prominent paraphasias of all types, including neologisms, and they have relatively preserved response to axial or whole-body commands. Their agraphia is also empty of content and is paragraphic compared with the mechanical and other writing disturbances previously described in patients with delirium.

The brain regions responsible for hallucinations remain unclear. We studied 89 brain lesions causing hallucinations using a recently validated technique termed lesion network mapping. We found that hallucinations occurred following lesions to a variety of different brain regions, but these lesion locations fell within a single functionally connected brain network. This network was defined by connectivity to the cerebellar vermis, inferior cerebellum (bilateral lobule X), and the right superior temporal sulcus. Within this single hallucination network, additional connections with the lesion location dictated the sensory modality of the hallucination: lesions causing visual hallucinations were connected to the lateral geniculate nucleus in the thalamus while lesions causing auditory hallucinations were connected to the dentate nucleus in the cerebellum. Our results suggest that lesions causing hallucinations localize to a single common brain network, but additional connections within this network dictate the sensory modality, lending insight into the causal neuroanatomical substrate of hallucinations.

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Acknowledgements

DT was supported by a DuPont-Warren Fellowship Award from Harvard Medical School. JJ was supported by funding from the Academy of Finland #295580, the Finnish Medical Foundation, and a grant from the Orion Research Foundation. JMF was supported by RETICS INVICTUS PLUS (RD06/0019/0010) and FEDER. MDF was supported by the National Institute of Mental Health (R01MH113929), Nancy Lurie Marks Foundation, and Mathers Foundation. None of the institutions mentioned above have a role in the design and conduct of the study, in the collection, management, analysis, and interpretation of the data, in the preparation, review, or approval of the manuscript, nor in the decision to submit the manuscript for publication.

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Authors and Affiliations

  1. Department and Research Institute of Rehabilitation Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea

    Na Young Kim

  2. Berenson-Allen Center for Non-Invasive Brain Stimulation and Division of Cognitive Neurology, Department of Neurology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA

    Na Young Kim, Joey Hsu, Juho Joutsa, Louis Soussand, Alvaro Pascual-Leone & Michael D. Fox

  3. Department of Psychiatry, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA, USA

    Daniel Talmasov

  4. Department of Neurology, New York University School of Medicine, New York, NY, USA

    Daniel Talmasov

  5. Turku Brain and Mind Center, Department of Neurology, University of Turku, Turku, Finland

    Juho Joutsa

  6. Division of Clinical Neurosciences, Turku University Hospital, Turku, Finland

    Juho Joutsa

  7. Athinoula A. Martinos Centre for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Charlestown, MA, USA

    Ona Wu & Michael D. Fox

  8. J. Philip Kistler Stroke Research Center, Department of Neurology, Massachusetts General Hospital, Charlestown, MA, USA

    Natalia S. Rost

  9. Department of Neurology, Biomedical Research Institute (IIB Sant Pau), Hospital de la Santa Creu i Sant Pau (HSCSP), Universidad Autónoma de Barcelona, Barcelona, Spain

    Estrella Morenas-Rodríguez & Joan Martí-Fàbregas

  10. German Center for Neurodegenerative Diseases (DZNE) Munich, Munich, Germany

    Estrella Morenas-Rodríguez

  11. Chair of Metabolic Biochemistry, Biomedical Center (BMC), Faculty of Medicine, Ludwig-Maximilians-Universität München, Munich, Germany

    Estrella Morenas-Rodríguez

  12. Institut Guttmann de Neurorehabilitació, Universitat Autonoma de Barcelona, Badalona, Spain

    Alvaro Pascual-Leone

  13. Department of Psychiatry, Clinical Neuroscience Research Unit, Connecticut Mental Health Center, Yale University School of Medicine, New Haven, CT, USA

    Philip R. Corlett

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Contributions

NYK, JH, and MDF conceived and designed the work; NYK, JJ, OW, NR, EMR, and JMF acquired the data; NYK, JH, JJ, LS, APL, and MDF analyzed and interpreted data; NYK, DT, and MDF drafted the work; PRC, APL, and MDF revised the manuscript critically for important intellectual content; all authors approved the final version to be published and agree to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. NYK and MDF had full access to all the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis.

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Kim, N.Y., Hsu, J., Talmasov, D. et al. Lesions causing hallucinations localize to one common brain network. Mol Psychiatry 26, 1299–1309 (2021). //doi.org/10.1038/s41380-019-0565-3

What part of the brain controls visual hallucinations?

Visual hallucinations were associated with reduced volume in bilateral occipital regions, right supramarginal gyrus and left fusiform gyrus, bilateral dorsolateral prefrontal cortex, frontal pole and the middle portion of the left cingulate gyrus.

What brain problems cause hallucinations?

Common Causes of Hallucinations.
Schizophrenia. More than 70% of people with this illness get visual hallucinations, and 60%-90% hear voices. ... .
Parkinson's disease. ... .
Alzheimer's disease. ... .
Migraines. ... .
Brain tumor. ... .
Charles Bonnet syndrome. ... .
Epilepsy..

What part of the brain causes hallucinations in schizophrenia?

In schizophrenia, the right superior temporal region has repeatedly been associated with hallucinations in anatomical and functional brain imaging studies.

What part of the brain causes delusions and hallucinations?

Delusions result from right hemisphere lesions, but it is the left hemisphere that is deluded." Often bizarre in content and held with absolute certainty, delusions are pathologic beliefs that remain fixed despite clear evidence that they are incorrect.

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