concept also: BCI, brain computer interface, neural interface
Brain-computer interface
A system that reads neural activity and turns it into control signals — letting a person operate a cursor, type, or draw using decoded intent rather than movement.
Most high-fidelity BCIs today are invasive, placing electrodes on or in the cortex. The variable that gates everything is bandwidth: how much intent can be decoded, how fast, and how reliably.
The trajectory runs from simple selection (think-to-click) toward continuous, fluid control. Each step up in fidelity — cursor, then handwriting, then freeform drawing — is a real marker of progress.