Neglect after a stroke is an attention disorder where the brain fails to process or respond to one side of the world, usually the left. It’s not a vision problem. The eyes still work, but the brain essentially ignores information coming from the affected side. About 61% of people who have a stroke in the right side of the brain develop some form of neglect, and roughly 22% of those with a left-brain stroke experience it as well.
How Neglect Differs From Vision Loss
Stroke can also cause hemianopia, which is actual loss of vision in one half of the visual field. The two conditions look similar from the outside, but they work very differently. Hemianopia is a sensory problem: the brain’s visual processing areas are damaged, so signals from one side never arrive. People with hemianopia are typically aware they can’t see on one side and learn to turn their head to compensate.
Neglect is an attention problem. The visual signals reach the brain, but the brain doesn’t register them as important or even real. A person with neglect may eat food from only the right side of their plate, shave only the right half of their face, or bump into objects on their left without understanding why. Unlike hemianopia, which cuts off sharply at the midline, neglect creates a gradient. Attention is pulled strongly toward the side of the brain lesion, so even things slightly to the right of center may get more attention than things directly ahead. This gradient effect means neglect can influence the entire visual field, not just one half.
Perhaps the most striking difference is awareness. Many people with neglect genuinely don’t realize anything is wrong. They aren’t choosing to ignore the left side. Their brain has lost the capacity to attend to it.
What Causes It in the Brain
Neglect most commonly results from damage to the right hemisphere, particularly areas involved in directing and sustaining spatial attention. The right side of the brain plays a dominant role in monitoring the entire surrounding space, which is why right-hemisphere strokes produce neglect far more often and more severely than left-hemisphere strokes. When this network is disrupted, the brain’s attention map becomes lopsided, heavily favoring the side of the lesion.
Different Forms of Neglect
Neglect doesn’t always look the same from person to person, partly because it can affect different zones of space.
- Peripersonal neglect affects the space within arm’s reach. Someone with this form may struggle with tasks right in front of them: reading, eating, grooming, finding objects on a table. This type is strongly linked to balance problems and difficulty with everyday activities like locating personal belongings.
- Extrapersonal neglect affects space beyond arm’s reach. People with this form may have particular trouble navigating rooms, hallways, or outdoor environments. Wayfinding becomes the primary challenge.
These two forms can occur independently. A person can have severe neglect for nearby objects while navigating a hallway just fine, or vice versa. Some people have both. There’s also personal neglect, where someone ignores the affected side of their own body, failing to dress one arm or wash one side of their face.
How Neglect Is Detected
Clinicians use several paper-and-pencil screening tests to identify neglect. In the line bisection test, you’re asked to mark the center of horizontal lines drawn on a page. People with neglect consistently place their mark too far to the right, because they underestimate (or completely miss) the left portion of each line. A mark displaced more than 6 millimeters from the true center, or skipping two or more lines on one side of the page, suggests neglect.
However, line bisection alone misses about 40% of people with severe neglect. Cancellation tests, where you cross out specific targets scattered across a page (stars, bells, or letters), tend to be more reliable. These tasks demand sustained searching across the entire page, making the attentional bias harder to hide. Each cancellation test still misses roughly 6% of cases, so clinicians often use several tests together to get an accurate picture.
Recovery Timeline and Outlook
Neglect improves on its own for many people, but the recovery window narrows over time. In the first three months after stroke, about 42% of people recover. Between three and six months, that number climbs to 53%. After six months, additional improvement is minimal, with the overall recovery rate reaching only about 56%. That means roughly 44% of people with neglect still have measurable symptoms beyond six months.
The presence of neglect significantly affects overall stroke recovery. It reduces independence in daily activities, makes rehabilitation less effective, lowers quality of life, and influences whether someone can return home or needs long-term care. Because neglect makes it harder to engage with rehabilitation exercises (you may not notice the therapist on your left, or may ignore half of a task), it can slow recovery from other stroke-related problems like weakness or mobility loss.
Treatment Approaches
One of the most studied treatments is prism adaptation. You wear glasses fitted with lenses that shift your entire visual field about 10 degrees to the right. Then you repeatedly point at targets. Because everything looks shifted, your brain has to recalibrate, gradually redirecting your motor and attention systems back toward the left. A typical course involves 30-minute sessions daily for two weeks. In controlled trials, patients who underwent prism adaptation improved significantly more than those who did simple pointing exercises without prisms, and the benefits were still present a month after treatment ended.
Visual scanning training takes a more direct approach, teaching you to consciously and systematically look toward the neglected side. Over time, this can become more automatic. Limb activation therapy encourages use of the arm or leg on the affected side, which can also help draw attention back toward that side of space. Most rehabilitation programs combine several of these strategies.
Practical Strategies for Daily Life
Environmental setup makes a real difference. Important items like glasses, phone, or a call button should be placed on the non-neglected side so they’re never missed. At the same time, placing stimulating objects on the neglected side, like a television, family photos, or flowers, encourages the brain to look that direction more often.
Visitors and family members should sit on the affected (usually left) side during conversations, gently pulling attention toward the neglected space. Background noise and clutter make neglect worse, so reducing distractions before important tasks helps. Fatigue amplifies symptoms noticeably, so scheduling demanding activities during the person’s most alert hours can improve performance. These strategies won’t cure neglect, but they create an environment that works with the brain’s limitations while still challenging it to improve.