Neuralink lets a person control a computer by measuring movement-related activity in the brain. It sends those signals around a damaged spinal pathway, without repairing the spinal cord.
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Playing chess without a mouse
In 2024, Neuralink participant Noland Arbaugh showed computer chess using his brain-computer interface. A brain-computer interface connects measured brain activity to an external device.
His implant surgery took place in January. The public chess demonstration followed in March. The Short correctly gives the year without assigning the demonstration to the surgery month.
Arbaugh did not need to move a mouse with his hand. Software used the recorded signals to move a cursor. The computer still supplied the chess program and its ordinary controls.
The damaged movement pathway
Movement normally depends on communication between the brain, spinal cord, nerves, and muscles. An injury can interrupt part of that route. Activity related to attempted hand movement can still remain above a spinal cord injury.
The video's cable drawing explains that interruption. It does not describe every cause or degree of paralysis. Some injuries preserve different amounts of movement and sensation.
For this application, the system takes useful signals from above the injury. It sends commands to a computer instead of restoring the original route to the hand.
What the electrodes measure
The N1 implant described for the PRIME study contains 1,024 recording electrodes on 64 flexible threads. An electrode is a conducting contact that measures electrical signals. N1 is the implant's identifier.
The Short describes electrodes on the brain. More precisely, the thin threads enter brain tissue. Their contacts record voltage changes near neurons, which are nerve cells.
A spike is a brief electrical signal produced by a neuron. Several electrodes can capture patterns related to intended movement. One electrode does not necessarily measure only one cell.
The left and right patterns in the animation simplify how groups of cells encode movement. There is no universal left-thought code that works identically in every person's brain. The decoder must learn a useful relationship for its user and task.
From a pattern to a cursor
Implant electronics process the recorded signals. A wireless connection sends information to an external computer. A decoder then maps the pattern to a command, such as a cursor movement.
The decoder is a computer program. During training, it compares neural activity with attempted actions or displayed targets. Repeated examples help it estimate the intended movement.
The result depends on the whole system. The electrodes supply measurements, the software interprets them, and the computer carries out the command. The implant alone does not understand the rules of chess.
A new route, with a clear limit
Neuralink's public trial materials describe an investigational device. Permission to study a device does not mean approval for general sale. The PRIME study examines early safety and function.
The device discussed here does not mend the spinal cord. It can provide useful access to a computer while the original movement limitation remains. That is why the final image shows a new route around the injury.
What this means
Useful control can come from signals that remain above a spinal injury. The achievement is a connection between those signals and an external action.
It does not establish unrestricted mind reading, guaranteed performance, or a cure for paralysis. The longer explanation covers training, surgery, evidence, and the regulatory pathway.
FAQ
Does Neuralink make the person's hand move again?
The cursor-control system described here operates an external computer. It does not restore the original pathway to the hand.
Does each electrode read one thought?
No. Electrodes measure local electrical activity. Software uses patterns across measurements to estimate trained actions.
Is the chip sitting outside the brain?
The implant sits in the skull, while its thin electrode threads enter brain tissue.
Can anyone buy this implant?
The checked trial materials describe an investigational system. They do not establish approval for general sale.