Encyclopedia of Clinical Neuropsychology

2018 Edition
| Editors: Jeffrey S. Kreutzer, John DeLuca, Bruce Caplan

Blindsight

  • Sophie LebrechtEmail author
  • Michael J. Tarr
Reference work entry
DOI: https://doi.org/10.1007/978-3-319-57111-9_1346

Short Description or Definition

Blindsight is a neuropsychological disorder that results from damage to the primary visual cortex (V1). Such localized cortical damage produces localized visual impairment in the patient’s visual field contralateral to the site of the damage. Critically, despite the nominal loss of vision, patients with blindsight preserve the ability to detect and discriminate visual stimuli presented in the impaired region of their visual field. Lawrence Weiskrantz’s (1986) observation of this ability to “see” stimuli in a “blind” visual field led him to refer to this disorder as “blindsight.”

Categorization

There are two types of blindsight, termed Type I and Type II. Patients with Type I blindsight report no conscious awareness of stimuli presented in the damaged region of their visual field, yet preserve the ability to detect stimuli presented there. Patients with Type II blindsight report a faint conscious perception of stimuli in the damaged region of their visual...

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References and Readings

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Visual Neuroscience LaboratoryBrown UniversityProvidenceUSA