Neuroscience
“Don't stand so close to me!”
A review of how the brain tracks the zone within arm's reach may explain why Kabuki kids struggle with distance and personal space —and why practice could reshape that map.
I've noticed my Kabuki kid sometimes struggles with spatial awareness and reaching for objects. Why is that?
The brain creates a specialized zone called peripersonal space, which is the area immediately surrounding the body. It uses a network of brain areas to combine touch, sight, and sound information to guide actions like reaching and grasping. In certain neurodevelopmental conditions, the processing of this near-body space can be altered.
What is peripersonal space?
It's the space immediately around your body, like the area you can reach with your arms. Your brain keeps track of this space to help you move safely and interact with things around you.
How does the brain do that?
It combines information from your senses, like touch, vision, and sound, to build a map of this space. This map is constantly updated and can change based on what you're doing or feeling.
How does the brain know where the boundaries of this space are?
The brain relies on the body schema, which is an internal representation of the body used specifically for action. To guide movement, it must constantly monitor the position and motion of the limbs in relation to nearby objects. The brain actually uses this dynamic body schema to determine the boundaries of our peripersonal space.
Many Kabuki kids bump into things or stand too close. This isn't clumsiness or bad manners. It may be the brain's map of the space around the body working differently.
Scientists have a name for that map: peripersonal space. It's the zone right around you—within arm's reach—where your brain blends what you see, hear, and feel to guide movement.
A major review of brain research helps explain how this "nearby space" is built. And it offers a fresh way to think about why navigating the physical world can be so hard for Kabuki children.
Two kinds of body knowledge
Your brain holds more than one idea of your body. One is the picture you have of how you look. Another is a working tool for action—a sense of where your limbs are right now, used to move and reach.
This action-tool is closely tied to the space around the body. The two are so linked that, in some parts of the brain, it may not even make sense to separate them.
How the brain watches the space around you
To move safely, your brain must constantly track where your body is and where nearby objects are. This lets you reach for a cup—or duck under a branch without thinking.
Special brain cells make this possible. Researchers found neurons that fire both when a body part is touched and when something appears near that same body part.
These cells don't track space the way a camera does. Instead, they map the area around each body part—your hand, your arm, your face. The response is strongest when objects are closest to the skin, fading as they move away.
Remarkably, these cells can hold onto information. In one experiment, a cell kept firing for an object near the body even after the lights went out and the object was silently removed—as if the brain still expected it to be there.
A map that combines the senses
This nearby-space map isn't built from vision alone. It blends touch, sight, sound, and your sense of where your limbs are positioned. More than half of certain brain cells that respond to touch on the back of the head also respond to sound.
That blending has a practical payoff. When something touches your hand, you react faster if you also see something near that hand. The senses reinforce each other inside this special zone.
The map can stretch and shift
Here's what may matter most for Kabuki families: this map is not fixed. It changes with experience.
Use a tool—a stick, a rake—to reach far objects, and within minutes the map expands to include the tool's tip. The far space you just worked in gets pulled in and treated as "near.
The map also updates as children grow. As arms get longer and reach farther, the brain must keep adjusting its picture of nearby space over time.
When the map goes wrong
We know the map can break down because brain injuries reveal it. After certain injuries, patients miss a touch on one hand when something also appears near the other. But move a visual stimulus close to the affected hand, and their perception can improve.
This tells us something important: a distorted body-and-space map changes how a person perceives the world around them. For Kabuki children who struggle with distance and spatial reasoning, this is the very machinery that may be affected.
Not one place, but a network
Perhaps the biggest lesson is this: there is no single "space center" in the brain. The sense of your body and the space around it emerges from many brain regions working together.
Each region handles its own slice—the space around one body part, the movements made with it—using its own frame of reference. When you walk home tonight and a low branch crosses your path, this whole network quietly protects you.
For our children, understanding this network is a start. If the map of nearby space can stretch through experience—through tool use, through practice—then it is not carved in stone. That flexibility is where hope for support and therapy may live.
generated by Claude