Related Experiment Video
Updated: Aug 13, 2026
07:41
Design and Implementation of a Bespoke Robotic Manipulator for Extra-corporeal Ultrasound
Published on: January 7, 2019
High-order Characteristics of Upper Limb Intermuscular Coupling in Natural Manipulation
Summary
This study introduces a new framework to analyze high-order interactions (HOIs) in muscle coordination, revealing task-dependent muscle redundancy and synergy during grasping and lifting.
Area of Science:
- Neuroscience
- Biomechanics
- Systems Biology
Background:
- Current intermuscular coupling (IMC) analyses often use pairwise metrics, potentially missing complex, high-order interactions (HOIs).
- Understanding HOIs is crucial for elucidating neuromuscular coordination during motor tasks.
Purpose of the Study:
- To develop and apply a multi-domain high-order analysis framework for IMC.
- To characterize high-order dependencies among muscles during grasping/lifting tasks across time, frequency, and connectivity domains.
Main Methods:
- Integrated O-information rate (OIR), frequency-domain O-information rate (fOIR), and β-band B-index-rate network analysis.
- Focused on activation and coordination patterns during natural grasping and lifting tasks.
Main Results:
- Identified significant information redundancy within proximal muscle groups and synergistic interactions across different muscle groups.
- Observed task- and posture-dependent variations in high-order dependency patterns, with greater redundancy during lifting than gripping.
- Found high-order dependencies predominantly in the β-band (15-30 Hz), indicating redundancy and synergy during upper-limb tasks.
Conclusions:
- The novel framework reveals task-dependent HOIs in neuromuscular control.
- Findings highlight muscle redundancy within groups and synergy across groups, advancing understanding of motor control.
- Provides insights applicable to motor control systems and rehabilitation strategies.
Related Concept Videos
01:24Muscle Coordination and Action
Muscle coordination is a complex and finely tuned process essential for smooth and purposeful movements like flexion, extension, adduction, abduction, and rotation. The human body orchestrates the actions of various muscles working in concert, each with a specific role. Four functional types describe how muscles work together: agonist, antagonist, synergist, and fixator.
Agonists
Agonist muscles, often called prime movers, are the primary muscles responsible for producing a specific movement.
Agonists
Agonist muscles, often called prime movers, are the primary muscles responsible for producing a specific movement.
01:20Motor Unit Stimulation
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...
01:20Excitation-Contraction Coupling in Skeletal Muscles
Excitation-contraction coupling is a series of events that occur between generating an action potential and initiating a muscle contraction. It occurs at the triad, a structure found in skeletal muscle fibers that comprise a T-tubule and terminal cisternae of the sarcoplasmic reticulum on each side. These triads are visible in longitudinally sectioned muscle fibers. They are typically located at the A-I junction — the junction between the A and I bands of the sarcomere.
When an action potential...
When an action potential...
01:15Bones of the Upper Limb: Ulna
The ulna and radius are parallel bones of the antebrachium or the forearm. The ulna lies medially and consists of a bony tip called the olecranon process at its proximal end. This hook-like projection articulates with the olecranon fossa of the humerus and forms the "hinged" ulnohumeral part of the elbow joint. This joint facilitates forearm extension and flexion while preventing its hyperextension. Similarly, the coronoid process, another bony projection on the proximal/anterior side of the...
01:16Muscles of the Forearm that Move the Hand and Fingers
The muscles of the forearm that move the wrist, hand, and digits are numerous and diverse. They can be classified into two groups based on their location and function — the anterior and posterior compartment muscles.
Anterior Compartment
The anterior compartment muscles originate from the humerus. They primarily function as flexors and are also known as flexor muscles. They typically insert on the carpals, metacarpals, and phalanges. The superficial layer includes the flexor carpi radialis,...
Anterior Compartment
The anterior compartment muscles originate from the humerus. They primarily function as flexors and are also known as flexor muscles. They typically insert on the carpals, metacarpals, and phalanges. The superficial layer includes the flexor carpi radialis,...
01:13Motor Units
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...