Cardinality as a highly descriptive feature in myoelectric pattern recognition for decoding motor volition
1Department of Signals and Systems, Chalmers University of Technology Gothenburg, Sweden ; Centre for Advanced Reconstruction of Extremities, Sahlgrenska University Hospital Gothenburg, Sweden ; Integrum AB Gothenburg, Sweden.
Frontiers in Neuroscience
|November 19, 2015
Summary
A new myoelectric feature called cardinality significantly improves muscle activity prediction. This advancement enhances control for prosthetic limbs and rehabilitation devices, benefiting patients with motor impairments.
Area of Science:
- Biomedical Engineering
- Rehabilitation Science
- Signal Processing
Background:
- Myoelectric signal descriptors are crucial for clinical practice and rehabilitation research.
- These descriptors, extracted from sliding time windows, are used in pattern recognition to decode motor volition for controlling assistive devices.
- Existing features vary in effectiveness and computational cost.
Purpose of the Study:
- To introduce and evaluate a novel myoelectric feature, cardinality.
- To compare cardinality's performance against traditional and recent myoelectric features.
- To determine the optimal conditions for cardinality's application in myoelectric pattern recognition.
Main Methods:
- Cardinality was calculated and compared with established time-domain features (Hudgins' set) and rough entropy.
- Performance was assessed across various conditions: sampling frequencies, time window lengths, contraction dynamics, movement types (single/simultaneous), and classification algorithms.
- Signal resolution was maintained between 12 and 14 bits.
Main Results:
- Cardinality consistently outperformed all other evaluated myoelectric features.
- This superior performance was observed across diverse experimental conditions and classification algorithms.
- The effectiveness of cardinality was particularly noted with a signal resolution between 12 and 14 bits.
Conclusions:
- Cardinality offers a more accurate and robust method for myoelectric pattern recognition compared to existing features.
- This feature has significant potential for improving the control of limb prostheses, exoskeletons, and rehabilitation therapies.
- The study provides open-access code and data, facilitating further research and development in myoelectric control systems.
Related Concept Videos
01:20Motor Unit Stimulation
4.8K
When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...
4.8K
01:48Classification of Skeletal Muscle Fibers
60.3K
Skeletal muscles continuously produce ATP to provide the energy that enables muscle contractions. Skeletal muscle fibers can be categorized into three types based on differences in their contraction speed and how they produce ATP, as well as physical differences related to these factors. Most human muscles contain all three muscle fiber types, albeit in varying proportions.
Slow-Twitch Muscle Fibers
Slow oxidative, muscle fibers appear red due to large numbers of capillaries and high levels of...
Slow-Twitch Muscle Fibers
Slow oxidative, muscle fibers appear red due to large numbers of capillaries and high levels of...
60.3K
01:09Functional Classification of Joints
9.0K
Functional Classification of Joints
The functional classification of joints is determined by the amount of mobility between the adjacent bones. Joints are functionally classified as a synarthrosis or immobile joint, an amphiarthrosis or slightly moveable joint, or as a diarthrosis, a freely moveable joint. Fibrous and cartilaginous joints can be functionally classified as either synarthroses or amphiarthroses, whereas all synovial joints are classified as diarthroses.
Synarthrosis
An...
The functional classification of joints is determined by the amount of mobility between the adjacent bones. Joints are functionally classified as a synarthrosis or immobile joint, an amphiarthrosis or slightly moveable joint, or as a diarthrosis, a freely moveable joint. Fibrous and cartilaginous joints can be functionally classified as either synarthroses or amphiarthroses, whereas all synovial joints are classified as diarthroses.
Synarthrosis
An...
9.0K
01:27Specialized Characteristics of Cardiac Muscles
4.9K
The primary role of cardiac muscles is to propel blood throughout the cardiovascular system. The cardiac muscle cells, or cardiomyocytes, exhibit specialized characteristics that allow them to perform this function.
Cardiac muscle cells are smaller than skeletal muscles, averaging 10–20 mm in diameter and 50–100 mm in length. However, they have large energy demands for continuous contraction and relaxation. This energy is almost exclusively derived from aerobic metabolism of energy...
Cardiac muscle cells are smaller than skeletal muscles, averaging 10–20 mm in diameter and 50–100 mm in length. However, they have large energy demands for continuous contraction and relaxation. This energy is almost exclusively derived from aerobic metabolism of energy...
4.9K
01:13Motor Units
10.0K
The motor unit is a fundamental component of the neuromuscular system and plays a crucial role in coordinating muscle contractions. It consists of a somatic motor neuron, which connects and controls multiple skeletal muscle fibers, forming a single functional segment. The axon of the motor neuron branches out and establishes synaptic connections known as neuromuscular junctions with individual muscle fibers within the motor unit.
Motor units come in different sizes, with smaller units...
Motor units come in different sizes, with smaller units...
10.0K
00:46Motor Units
63.0K
A motor unit consists of two main components: a single efferent motor neuron (i.e., a neuron that carries impulses away from the central nervous system) and all of the muscle fibers it innervates. The motor neuron may innervate multiple muscle fibers, which are single cells, but only one motor neuron innervates a single muscle fiber.
63.0K