What is a Brain-Computer Interface (BCI)?

What it is: A BCI is a device that lets a person control a computer (or another device) directly with their brain. No hands needed, no voice needed — just thoughts.
Who it’s for: Anyone trying to understand brain chips
Best if: You’ve seen ‘BCI’ in headlines and need it in plain English
Skip if: You work in neuroscience

BCI stands for Brain-Computer Interface. The name is long but the idea is simple: a BCI reads what your brain is doing and turns it into a command a computer can follow.

Imagine wanting to move a cursor on a screen. Normally you pick up a mouse. With a BCI, you just think “move left” and it moves.

Two main types

• Inside your head (invasive). A small chip is placed on or in the brain. Best signal, but it’s brain surgery. Example: Neuralink.
• Outside your head (non-invasive). A cap with sensors sits on your scalp. No surgery, but the signal is fuzzy. Often used in labs.

Who is BCI for?

• People who are paralyzed. Lets them use phones, computers, or robot arms.
• People with ALS or strokes. Lets them speak through a computer voice.
• Maybe, one day: everyone. Musk talks about healthy people using BCIs to work faster. That’s far off.

Companies making BCIs

• Neuralink (Elon Musk)
• Synchron (goes in through a blood vessel, no skull cut)
• Blackrock Neurotech (older, used in research for years)
• Precision Neuroscience

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