Persistence of training-induced visual improvements after occipital stroke.

Damage to the primary visual cortex causes homonymous visual impairments that appear to benefit from visual discrimination training. However, whether improvements persist without continued training remains to be determined and was the focus of the present study. After a baseline assessment visit, 20 participants trained twice daily in their blind-field for a minimum of six months (median=155 sessions), using a motion discrimination and integration task.

Neurochemistry and functional connectivity in the brain of people with Charles Bonnet syndrome.

Background: Charles Bonnet syndrome (CBS) is a condition in which people with vision loss experience complex visual hallucinations. These complex visual hallucinations may be caused by increased excitability in the visual cortex that are present in some people with vision loss but not others.

Objectives: We aimed to evaluate the association between γ-aminobutyric acid (GABA) in the visual cortex and CBS.