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**Brain signals control an external device.
**Brain signals control an external device.
***An example is the original BrainGate BCI where an implantable array let a patient control a computer cursor.
***An example is the original BrainGate BCI where an implantable array let a patient control a computer cursor.
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[[File:A.jpg|none|thumb|200px|Open-Loop Efferent BCI]]
*[B] Open-Loop Afferent BCI
*[B] Open-Loop Afferent BCI
**Electrical stimulation to the brain by a device.
**Electrical stimulation to the brain by a device.