The performance of Brain-Computer
Interface (BCI) systems has significantly evolved over the past 50 years,
distinguishing between direct and indirect connection methods.
Direct
Connection Performance:
1.
Definition:
Direct connection BCIs involve the real-time measurement of electrical activity
directly from the brain, typically using techniques such as:
- Electroencephalography (EEG):
Non-invasive, measuring electrical activity through electrodes on the
scalp.
- Invasive Techniques: Such as
implanted electrodes, which provide higher signal fidelity and resolution.
2.
Historical Development:
- Early Research: The journey began in the 1970s
with initial experiments at UCLA aimed at establishing direct
communication pathways between the brain and devices. Research in this
period focused primarily on animal subjects and theoretical frameworks.
- Technological Advancements:
As technology advanced, particularly in the areas of signal processing and
machine learning, the direct connection methods began to yield more accurate
and reliable interpretations of brain signals for practical applications
like controlling devices.
3.
Current Performance:
- Complex Command Recognition:
Improved algorithms now allow for high accuracy in interpreting user
intentions, enabling the control of complex devices (e.g., robotic
prosthetics) .
- Calibration: While intrusive methods such as
implanted electrodes offer better signals, they require more extensive
calibration and carry risks.
Indirect
Connection Performance:
1.
Definition:
Indirect connection BCIs acquire brain-related metrics that do not directly measure
the electrical activity of neurons. Methods include:
- Functional Magnetic Resonance Imaging (fMRI):
Measures brain activity by detecting changes associated with blood flow.
- Functional Near-Infrared Spectroscopy (fNIRS):
Involves measuring hemodynamic responses associated with neural activity.
2.
Historical Development:
- Emergence of Non-invasive Techniques:
The non-invasive BCI systems became more prevalent in the 1990s,
leveraging indirect methods to allow users to interact with computers
without the need for invasive procedures
- Application Expansion: This evolution
led to applications beyond medical, including gaming and consumer
products
3.
Current Performance:
- User Comfort and Accessibility:
Indirect BCIs, such as fNIRS and fMRI, offer a user-friendly environment
without the risks associated with invasive methods, making them more
widely acceptable for use in various applications.
- Real-time Analysis: Although
providing less temporal resolution than direct methods, advances in
imaging technologies have enhanced the real-time analysis capabilities of
indirect BCIs for practical tasks.
Summary
of Performance:
In summary, the direct connection BCIs
have made strides in accuracy and capability through improved electrode
technology and sophisticated algorithms, particularly beneficial in medical
applications. Indirect connection BCIs, while generally less invasive, have
developed to become user-friendly alternatives, particularly suited for research,
entertainment, and rehabilitation. Overall, both approaches have expanded
significantly over the last fifty years, leading to a diverse array of
applications that enhance human-computer interaction, especially for
individuals with disabilities.
Kawala-Sterniuk, A., Browarska, N., Al-Bakri, A., Pelc, M., Zygarlicki, J., Sidikova, M., Martinek, R., & Gorzelanczyk, E. J. (2021). Summary of over fifty years with brain-computer interfaces—A review. Brain Sciences, 11(43). https://doi.org/10.3390/brainsci11010043
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