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**Electrical stimulation to the brain by a device.
 
**Electrical stimulation to the brain by a device.
 
***An example is the original deep brain stimulation (DBS) used for Parkinson's treatment in which a neural implant gives off stimulation to the brain.
 
***An example is the original deep brain stimulation (DBS) used for Parkinson's treatment in which a neural implant gives off stimulation to the brain.
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[[File:B.jpg|none|thumb|200px|Open-Loop Afferent BCI]]
 
* [C] Closed-Loop Efferent BCI
 
* [C] Closed-Loop Efferent BCI
 
**Brain signals control an external device and then feedback is given to the user that enables them to change brain signals.
 
**Brain signals control an external device and then feedback is given to the user that enables them to change brain signals.
 
***An example would be the BrainGate BCI, in which the computer with the cursor also gave off instructions due to the signals it was picking up that then are relayed back to the patient to change the brain signals and thereby affect cursor control.
 
***An example would be the BrainGate BCI, in which the computer with the cursor also gave off instructions due to the signals it was picking up that then are relayed back to the patient to change the brain signals and thereby affect cursor control.
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[[File:C.jpg|none|thumb|200px|Closed-Loop Efferent BCI]]
 
*[D] Closed-Loop Afferent BCI
 
*[D] Closed-Loop Afferent BCI
 
**Electrical stimulation to the brain by a device and moderated by movement monitoring
 
**Electrical stimulation to the brain by a device and moderated by movement monitoring

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