16 Questions
What is an advantage of the electrodes used in sEMG recording?
Ease of placement, can be placed beneath or over clothes
What is the purpose of commercial textile electrodes?
To measure EMG activity and transmit control commands via delicate movements or muscle contractions
When did the history of EMG prosthetics begin?
The 1960s
What was the limitation of the first EMG-controlled prosthetic arm?
It could only perform a single function: opening and closing the hand
How do modern EMG-controlled ULPS primarily function?
Through a basic threshold-based system, monitoring muscle activity and triggering actions when exceeding a set limit
What is a limitation of current EMG interfaces?
Difficulty in allowing users to control multiple joints simultaneously
What is a challenge of EMG-controlled prosthetics with multiple degrees of freedom?
Controlling them becomes intricate, requiring unnatural movements to generate necessary EMG signals
What is a disadvantage of switching between different functions in EMG-controlled prosthetics?
Requires unnatural movements to generate the necessary EMG signals
When was the concept of surface electromyography (sEMG) first introduced?
1940s
What was the first successful application of sEMG?
Development of a myoelectric prosthetic arm
What has been the focus of research in recent decades?
Applications of sEMG interfaces
What are the advantages of sEMG interfaces over conventional devices?
Numerous advantages, including less user attention required, high signal-to-noise ratio, and robustness to ambient sound changes
How do sEMG signals compare to other biosignals in terms of signal-to-noise ratio?
sEMG signals offer reasonably high signal-to-noise ratio
What is the benefit of sEMG control compared to voice control?
Minor delay
How do sEMG interfaces benefit users with motor impairment?
They assist in the development of interactive interfaces with minimal requirement of user motor skills
What is required for users to effectively use sEMG interfaces?
Some training
Study Notes
Surface Electromyography (sEMG) in Prosthesis Applications
- sEMG has extensive applications in the field of prosthesis, with its effectiveness verified by numerous revolutionary developments and research attempts.
- The concept of sEMG was introduced in the 1940s, leading to the first successful development of a myoelectric prosthetic arm in 1960.
- Research has focused on sEMG interfaces, establishing their potential for disabled individuals and healthy users, and encouraging patents in mobile technology.
Advantages of sEMG Interfaces
- sEMG interfaces require less user attention compared to EEG-based controls or visual-based control.
- They permit the user to gaze about during the controlling task, unlike visual-based control.
- sEMG signals offer a reasonably high signal-to-noise ratio compared to other biosignals.
- sEMG control has a minor delay compared to voice control and is robust to changes in ambient sound.
Benefits for Users with Motor Impairment
- sEMG interfaces can assist in developing interactive interfaces with minimal requirement of user motor skills.
- However, some training is required to make the user familiar with the interface.
Electrodes in sEMG Recording
- Electrodes employed in sEMG recording offer ease in their placement and can be placed beneath the clothes or even fixed over them.
- Commercial textile electrodes, such as smart shorts, are available, measuring EMG activity and delivering control commands via delicate movements or various intensities of muscular contractions.
History of EMG Prosthetics
- The first commercially available EMG-controlled prosthetic arm was developed in the 1960s by the Central Prosthetic Research Institute of the USSR.
- Modern EMG-controlled ULPS rely on a basic threshold-based system, monitoring muscle activity and triggering specific actions when the muscle contraction strength surpasses a set limit.
Challenges and Limitations
- Controlling multiple joints simultaneously is a limitation of current EMG interfaces.
- Switching between different functions often requires unnatural movements to generate the necessary EMG signals.
- Newer prosthetics with multiple degrees of freedom (DOFs) allow for more complex movements, but controlling them becomes intricate.
Explore the applications of surface electromyography (sEMG) in the field of prosthesis, including its revolutionary developments and extensive research attempts.
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