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Lesions causing hallucinations localize to one common brain network.

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Hallucinations are linked to a specific brain network, not just isolated regions. Lesion network mapping reveals how damage within this network determines the type of hallucination experienced.

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Area of Science:

  • Neuroscience
  • Neurology
  • Brain Imaging

Background:

  • The precise brain regions underlying hallucinations are not fully understood.
  • Hallucinations can arise from damage to various brain areas.

Purpose of the Study:

  • To identify the common brain network associated with hallucinations.
  • To investigate how specific lesion locations within this network relate to hallucination modality.

Main Methods:

  • Utilized lesion network mapping on 89 patients with brain lesions causing hallucinations.
  • Analyzed functional connectivity patterns of lesion locations.

Main Results:

  • Lesions causing hallucinations consistently mapped to a single, functionally connected brain network.
  • This network involves connectivity with the cerebellar vermis, inferior cerebellum (lobule X), and right superior temporal sulcus.
  • Specific connections within the network predicted hallucination modality: visual hallucinations linked to the thalamus (lateral geniculate nucleus), auditory hallucinations to the cerebellum (dentate nucleus).

Conclusions:

  • Hallucinations originate from a unified brain network, challenging the notion of isolated lesion sites.
  • The neuroanatomical substrate of hallucinations is network-based, with specific connections modulating sensory experience.