What is it about?

Studying the precise anatomical regions in which electrical brain stimulation evoked experiential phenomena (mainly complex hallucinations and illusions), the authors found that complex visual hallucinations could be elicited over widespread cortical regions spanning all lobes of the right hemisphere but only rarely over the left occipital lobe.

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Why is it important?

These results offer some insights into lateralized differences in functional connectivity that may be used for presurgical functional mapping of the designated surgical area in patients with epilepsy.


Experiential phenomena are fascinating experiences of the human mind. Just imagine feeling inside of a dream, seeing sights and hearing voices, but being completely awake and aware of the situation. Even though this phenomena has intrigued neurosurgeons and neuroscientists for over a 100 years, its neural basis is still enigma. Hence, it was very interesting for me to research the neural circuits responsible for it.

Michal Andelman Gur
Weizmann Institute of Science

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This page is a summary of: Spatial distribution and hemispheric asymmetry of electrically evoked experiential phenomena in the human brain, Journal of Neurosurgery, July 2020, Journal of Neurosurgery Publishing Group (JNSPG),
DOI: 10.3171/2019.3.jns183429.
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