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Network Localization of Unconscious Visual Perception in Blindsight
Isaiah Kletenik1,2,3,4, Michael A Ferguson2,3,4, James R Bateman5
1Division of Cognitive and Behavioral Neurology, Brigham and Women's Hospital, Boston, MA.
Annals of Neurology
|December 28, 2021
Summary
Blindsight, a visual perception disorder, is linked to brain lesions connected to the medial pulvinar. This finding helps understand unconscious visual processing in patients with brain injuries.
Area of Science:
- Neuroscience
- Cognitive Science
- Ophthalmology
Background:
- Blindsight involves unconscious visual perception despite loss of conscious sight.
- Neuroanatomical pathways for blindsight remain debated due to conflicting prior research.
Purpose of the Study:
- To identify specific brain lesion locations associated with blindsight.
- To investigate the neuroanatomical pathways underlying unconscious visual perception in blindsight.
Main Methods:
- Systematic literature search for lesion locations in blindsight patients (n=34) and controls (n=35).
- Resting-state functional connectivity analysis using a large connectome database (n=1,000).
- Identification of connections significantly associated with blindsight versus no blindsight.
Main Results:
- Functional connectivity between lesion sites and the ipsilesional medial pulvinar significantly correlated with blindsight (p=0.029).
- No significant connectivity differences were found with other previously implicated brain regions.
- Findings were consistent across different lesion laterality and stimulus types.
Conclusions:
- Connectivity to the ipsilesional medial pulvinar is a key differentiator for lesion locations in blindsight.
- Results support the role of the medial pulvinar in the neuroanatomical substrate of unconscious visual abilities.
- Findings align with recent animal model data on unconscious visual processing.
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