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Psych J. 2015 Dec;4(4):178-85. doi: 10.1002/pchj.109. Epub 2015 Oct 15.

Sight and blindness in the same person: Gating in the visual system.

Author information

  • 1Institute of Medical Psychology, Ludwig Maximilian University, Munich, Germany.
  • 2Practice for Psychotherapy, Munich, Germany.

Abstract

We present the case of a patient having dissociative identity disorder (DID) who-after 15 years of misdiagnosed cortical blindness--step-by-step regained sight during psychotherapeutic treatment. At first only a few personality states regained vision whereas others remained blind. This could be confirmed by electrophysiological measurement, in which visual evoked potentials (VEPs) were absent in the blind personality states but were normal and stable in the seeing states. A switch between these states could happen within seconds. We assume a top-down modulation of activity in the primary visual pathway as a neural basis of such psychogenic blindness, possibly at the level of the thalamus. VEPs therefore do not allow separating psychogenic blindness from organic disruption of the visual pathway. In summary, psychogenic blindness seems to suppress visual information at an early neural stage.

© 2015 The Institute of Psychology, Chinese Academy of Sciences and Wiley Publishing Asia Pty Ltd.

KEYWORDS:

conversion disorders; dissociative identity disorder; lateral geniculate nucleus (LGN); psychogenic blindness; thalamus; visual evoked potentials (VEP, VECP); visual pathway

PMID:
26468893
[PubMed - in process]
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