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=== Invasiveness ===
=== Invasiveness ===
*Invasive
*Invasive
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**Invasive BCIs are implanted directly into the brain.
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**Invasive BCIs are implanted inside the skull or brain.
*Non-Invasive
*Non-Invasive
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**Non-invasive BCIs are placed outside of the brain.
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**Non-invasive BCIs are placed outside of the skull.
=== Activity ===
=== Activity ===
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<ref>[https://www.pantechsolutions.net/blog/brain-computer-interface/ Source]</ref>
*Active BCI:
*Active BCI:
**“An active BCI is a BCI which derives its outputs from brain activity which is directly consciously controlled by the user, independently from external events, for controlling an application.”
**“An active BCI is a BCI which derives its outputs from brain activity which is directly consciously controlled by the user, independently from external events, for controlling an application.”
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**“A passive BCI is a BCI which derives its outputs from arbitrary brain activity without the purpose of voluntary control, for enriching a human-computer interaction with implicit information.”
**“A passive BCI is a BCI which derives its outputs from arbitrary brain activity without the purpose of voluntary control, for enriching a human-computer interaction with implicit information.”
**Measures Tonic states (degree of “relaxation”, cognitive load, ...)
**Measures Tonic states (degree of “relaxation”, cognitive load, ...)
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[https://www.pantechsolutions.net/blog/brain-computer-interface/ Source]
=== Input and Output===
=== Input and Output===
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**Electrical stimulation to the brain is modulated depending on the recordings.
**Electrical stimulation to the brain is modulated depending on the recordings.
*** An example is Neuropace's BCI in treating epilepsy in which recordings of brain signals are used to modulate the electrical stimulation output.
*** 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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[https://jsf.co/wp-content/uploads/2020/08/JSF_Brain_Computer_Interfaces.pdf Source]
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<references />