PSYCH 330 Attention Nov. 28
Part 1: Spatial attention deficits and disorders
Neglect always Caused by stroke.
Anopia: visual deficits.
Hemianopia: a problem of processing information in one of the two vision fields.
Blindsight, are processing visual information in these fields in an unconscious way. If put an object in
their blind field, they can’t see anything about it, but if force them to choose between two objects,
they are pretty accurate in choosing the right one.
Contralesional: the side that is the opposite to the lesion field
Blindsight hemianopia is a sensory deficit.
Rods: motion sensitive, spread outside of the central fovea.
Cones help us see things finely in details.
Two pathways from eye to brain. One is the older go to brainstem and then thalamus ▯ secondary visual
the other newer pathway is primary visual pathway, which goes to thalamus.
Blindsight patients: can’t perceive the presented information, but can tell the motion of the items. t▯ wo
separate pathways in vision, one is the evolutionary new pathway: go to thalamus to
brain▯consciously seeing something.
The other is the evolutionary older pathway which goes to the brainstem ▯reflexive behavior, making
eye movement, directing gate & hands. Thus, the patient can use the older pathway to detect the
motion but can’t see and be able to aware of it.
Spatial neglect hemianopia is an attentional deficit ▯ anosognosia, unaware of the symptoms they have.
Neglect patients do not make compensatory head movements
Artery narrowed by atherosclerosis (atherosclerotic plaque)
Narrowed artery blocked by blood clot (ischemic stroke) ▯ no blood flow b ▯ rain neurons start to burn
glucose but not efficient, neurotransmitters will get disrupted. Glugamate is toxicant when there are
Hemorrhagic stroke: burst aner 85% ischemic ▯ most common
Plaque rupture ▯ the cause of 70
Signs: weakness; trouble speaking; vision problems; headache; dizziness;
Always left vision field, rare right vision field.
Neglect caused by TPJ junction in right hemisphere. VFC (IFG&MFC)
Severity of neglect varies. Some people can recover gradually.