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**Measures Tonic states (degree of “relaxation”, cognitive load, ...)
**Measures Tonic states (degree of “relaxation”, cognitive load, ...)
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These are the 5 types of BCI systems based on the possible combinations of input and output sources for the brain (neuroimaging / neurostimulation) and body (peripheral inputs and outputs such as keyboards and screens).<ref>https://jsf.co/wp-content/uploads/2020/08/JSF_Brain_Computer_Interfaces.pdf</ref>
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These are the 5 types of BCI systems based on the possible combinations of input and output sources for the brain (neuroimaging / neurostimulation) and body (peripheral inputs and outputs such as keyboards and screens).
*[A] Open-Loop Efferent BCI
*[A] Open-Loop Efferent BCI
**Brain signals control an external device.
**Brain signals control an external device.
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*[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.
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***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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***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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*[C] Closed-Loop Efferent BCI
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* [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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*[D] Closed-Loop Afferent BCI
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* [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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***An example is a Parkinson’s DBS-BCI in which a tremor of the wrist causes the electrical stimulation to change.
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***An example is a Parkinson's DBS-BCI in which a tremor of the wrist causes the electrical stimulation to change.
*[E] Bidirectional Afferent Closed-Loop BCI
*[E] Bidirectional Afferent Closed-Loop BCI
**Electrical stimulation to the brain is modulated depending on the recordings.
**Electrical stimulation to the brain is modulated depending on the recordings.
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***An example is Neuropace’s BCI in treating epilepsy in which recordings of brain signals are used to modulate the electrical stimulation output.
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*** An example is Neuropace's BCI in treating epilepsy in which recordings of brain signals are used to modulate the electrical stimulation output.
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