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| 4.
BCI - Intro |
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4.1.
Definition and features of a BCI
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4.1.3. The parts of a BCI |
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Like any communication or control system, a BCI has:
1) input
2) output
3) components that translate input into output
4) a protocol that determines the onset, offset,
and timing of operation.
Picture: basic design and operation
of any BCI system. Signals from the brain are acquired by electrodes
on the scalp or in the head and processed to extract specific
signal features (e.g. amplitudes of evoked potentials or sensorimotor
cortex rhythms, firing rates of cortical neurons) that reflect
the user’s intent. These features are translated into
commands that operate a device (e.g. a simple word processing
program, a wheelchair, or a neuroprosthesis). Success depends
on the interaction of two adaptive controllers, user and system.
The user must develop and maintain good correlation between
his or her intent and the signal features employed by the BCI;
and the BCI must select and extract features that the user can
control and must translate those features into device commands
correctly and efficiently.
Source:
Brain–computer
interfaces for communication and control, Clinical Neurophysiology
113 (2002) 767–791, Jonathan R. Wolpaw, Niels Birbaumer, Dennis
J. McFarland, Gert Pfurtscheller, Theresa M. Vaughan |
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