In the first part of the project we will employ behavioural as well as brain imaging methods to study the basic neural mechanisms of blindsight, that is, above chance visually guided behaviour in hemianopic
patients in the absence of visual awareness.
However, other common field deficits include arcuate defects, nasal steps, diffuse field loss and even hemianopic
For example, patients with hemianopic
field loss may have typical or near-typical acuities but experience additional challenges to safe and effective travel because of spatial and perceptual deficits.
Ibotenic acid lesions of the lateral substantia nigra restore visual orientation behavior in the hemianopic
This patient reported experiencing visual hallucinations in the hemianopic
A study, titled "Cognitive mechanisms and hallucinations as hallmarks of visual system plasticity in hemianopic
patients during vision restoration therapy," reviewed the broader perspectives of brain plasticity.
Lesions in the visual pathway result in abnormal colour vision in specific quadrants of the visual field or hemianopic
loss of colour perception.
10 (total, Participants were randomly (2005), I hemianopic
assigned to one of two (cross-over), field loss) experimental groups that 17 were statistically similar in age, gender, visual acuity, contrast sensitivity, and visual field loss.
If the lesion is large, a hemianopic
visual field defect might also be present in the contralateral field; for this reason, gross assessment of the visual field by confrontation methods can be useful.
We sought to answer the following main question with this research synthesis: What is the evidence that rehabilitative interventions are effective for improving the driving skills and performance of individuals with low vision, including those who have low vision or a hemianopic
field loss as the result of a stroke?
Lesions which occur after the LGN produce more congruent quadrantanopias (optic radiations), respecting the midlines, or hemianopic
defects if the whole optic radiation is affected.
By these means, homonymous or bi-temporal defects that came close to fixation, whether hemianopic
or quadrantonopic, are not accepted as safe for driving.