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2017 ; 11
(ä): 64
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English Wikipedia
From Cortical Blindness to Conscious Visual Perception: Theories on Neuronal
Networks and Visual Training Strategies
#MMPMID28912694
Hadid V
; Lepore F
Front Syst Neurosci
2017[]; 11
(ä): 64
PMID28912694
show ga
Homonymous hemianopia (HH) is the most common cortical visual impairment leading
to blindness in the contralateral hemifield. It is associated with many
inconveniences and daily restrictions such as exploration and visual orientation
difficulties. However, patients with HH can preserve the remarkable ability to
unconsciously perceive visual stimuli presented in their blindfield, a phenomenon
known as blindsight. Unfortunately, the nature of this captivating residual
ability is still misunderstood and the rehabilitation strategies in terms of
visual training have been insufficiently exploited. This article discusses type I
and type II blindsight in a neuronal framework of altered global workspace,
resulting from inefficient perception, attention and conscious networks. To
enhance synchronization and create global availability for residual abilities to
reach visual consciousness, rehabilitation tools need to stimulate subcortical
extrastriate pathways through V5/MT. Multisensory bottom-up compensation combined
with top-down restitution training could target pre-existing and new neuronal
mechanisms to recreate a framework for potential functionality.