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Neurological considerations
Author(s) -
KAWASAKI A
Publication year - 2014
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.2014.3463.x
Subject(s) - visual hallucination , brainstem , perception , neuroscience , psychology , sensory system , vestibular system , visual perception , visual system , cognitive psychology , lesion , medicine , audiology , visual cortex , psychiatry
Seeing light flashes, scintillations, movement, simple or complex forms which are not based on actual sensory visual input from the external world represents a group of positive visual phenomena , often referred to as « hallucinations ». Such visual experiences arise from abnormal endogenously‐ activated neural discharges and can originate from any part of the visual system. In certain cases of disordered spatial perception, the lesion may even arise from the brainstem vestibular pathway. This lecture will examine the possible central mechanisms by which hallucinations are generated and give clinical examples of different types of positive visual phenomena.