Hemispatial neglect is a disorder of attention where a person ignores one side of space, usually the left, after damage to the right hemisphere. In Cognitive Psychology, it shows how perception can fail when attention does not reach part of the visual field.
Hemispatial neglect is a condition in Cognitive Psychology where a person fails to attend to one side of space, most often the left side after damage to the right hemisphere. The person is not simply blind on that side. The bigger problem is that attention does not register or prioritize information from that half of the environment, so it may be left out of awareness.
A classic case involves right parietal lobe damage, often after a stroke. If the right hemisphere is injured, the person may ignore food on the left side of a plate, shave only the right side of the face, or bump into objects on the left. They may insist nothing is missing, because the neglected side is not being represented normally in conscious awareness.
This term matters because hemispatial neglect shows the difference between sensation, perception, and attention. The eyes and ears may still receive input, but that input does not get enough attentional priority to become part of what the person notices. In other words, the problem is not just the sense organs. It is the brain’s system for selecting and organizing information.
Neglect can show up across more than one sense. A person may fail to respond to sounds, touch, or movement on the neglected side, not only visual stimuli. That makes the condition more than a visual field issue. It is a broader spatial attention problem, tied to how the brain maps space around the body.
Severity varies a lot. Some people miss subtle details on one side, while others act as if the entire left half of the world is absent. In class examples, this is often used to show why damage to one brain region can change a person’s everyday behavior in very specific ways, like reading only half a page or eating from only one side of a tray. Rehabilitation often uses visual scanning training, where the person practices consciously turning attention toward the neglected side until that habit becomes more automatic.
Hemispatial neglect is one of the clearest examples of how attention shapes perception in Cognitive Psychology. It shows that seeing is not just about the eyes collecting input, because the brain still has to select what gets noticed and acted on. That makes it a strong case study for the idea that perception is an active process, not a passive camera feed.
The term also helps explain why brain damage can create very uneven problems. A person with neglect may understand language, remember facts, and move normally, but still miss half of a scene. That pattern tells you something specific about the brain: attention is partly spatial, and the right hemisphere is especially important for monitoring space on both sides, not just the left.
This concept is useful when you analyze real-world behavior. If someone keeps eating from only one side of a plate or reads only one side of a page after a stroke, hemispatial neglect is a better explanation than carelessness. It links the behavior to a known mechanism in attention, which is exactly the kind of reasoning cognitive psychology looks for.
It also connects to treatment. Visual scanning training works because it teaches the person to deliberately direct attention toward the neglected side. That turns the abstract idea of attention into something measurable and trainable, which is a big theme in the course.
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Visual cheatsheet
view galleryRight hemisphere
Hemispatial neglect is strongly linked to damage in the right hemisphere, especially areas that help monitor space and direct attention. This connection matters because the right hemisphere is often described as supporting attention across both sides of space, while left-hemisphere damage does not usually produce the same dramatic left-sided neglect. The term helps you connect brain localization with behavior.
Visual field
Neglect often looks like a problem with the visual field, but it is really an attention problem layered on top of sensory input. A person may have usable vision in the neglected side and still not respond to it. That distinction helps you separate sensory loss from attentional failure when you analyze a case.
Attentional bias
Hemispatial neglect is an extreme form of spatial attentional bias, where attention is pulled strongly toward one side and away from the other. In milder situations, bias can shape what gets noticed first or longest. Neglect shows what happens when that bias becomes severe enough to distort awareness of the whole scene.
Bottom-Up Processing
Bottom-Up Processing is about information coming in from the environment, but hemispatial neglect shows that incoming input is not enough by itself. Even when stimuli are present, they may not reach awareness if attention does not select them. The pairing helps you see why attention sits between sensation and perception.
A quiz or case question may describe someone eating from only the right side of a plate, ignoring the left side of a drawing, or failing to notice objects on one side after a stroke. Your job is to identify hemispatial neglect and connect it to damage in the right hemisphere, usually the right parietal lobe. If the prompt asks why the person is not just blind, explain that the problem is attentional awareness, not simple loss of sensation.
You may also be asked to compare neglect with a visual field defect or general inattention. In those cases, focus on whether the person can detect input but fails to attend to it. A strong answer mentions real behavior, like bumping into objects, reading one side of a page, or missing food on one side of a tray, because that shows you understand how the condition appears in daily life.
Hemispatial neglect is often confused with visual field loss, but they are not the same. Visual field loss means the sensory system cannot detect input from part of space, while neglect means the input is there but the brain does not attend to it. A person with neglect may still have intact eyesight on the ignored side, yet act as if that side does not exist.
Hemispatial neglect is an attention disorder where a person ignores one side of space, usually the left side.
It is most often linked to damage in the right hemisphere, especially the right parietal lobe.
The person may still receive sensory input from the neglected side, but the input does not reach full awareness.
Neglect can affect vision, touch, and sound, so it is more than a simple eye problem.
Visual scanning training helps by teaching the person to consciously shift attention toward the neglected side.
Hemispatial neglect is a condition where a person ignores one side of space, usually the left, because attention is disrupted. It is often caused by right hemisphere damage, especially after a stroke. Cognitive Psychology uses it to show that attention helps determine what becomes consciously perceived.
No. Blindness is a sensory problem, but hemispatial neglect is mainly an attentional problem. The person may still have functioning vision on the neglected side and yet fail to notice or respond to it. That is why the behavior can look like blindness even when the eyes are not the main issue.
The right hemisphere has a major role in directing attention across space, including toward both sides of the environment. When it is damaged, attention often becomes biased toward the right, leaving the left side underrepresented. That is why left-sided neglect is so common after right hemisphere injury.
One common approach is visual scanning training. The person practices deliberately turning attention toward the neglected side, such as scanning left to right when reading or searching a scene. This does not instantly fix the condition, but it can reduce missed information in daily tasks.