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Related Concept Videos

Anatomical Movements00:51

Anatomical Movements

Anatomical movements refer to the various actions or motions that can be performed by the body's joints and muscles. These movements are described using specific terms to provide a standardized way of discussing and understanding the range of motion at different joints.
Here are some common anatomical movements:
Flexion and extension motions are in the sagittal (anterior–posterior) plane of motion. These movements take place at the shoulder, hip, elbow, knee, wrist, metacarpophalangeal,...
Three-Dimensional Force System01:30

Three-Dimensional Force System

In mechanical engineering, a three-dimensional force system is a system of forces acting in three dimensions, with forces applied along the x, y, and z coordinate axes. The three-dimensional force system is an important concept in mechanical engineering, as it allows engineers to understand and analyze the behavior of objects and structures in three dimensions. By understanding the forces acting on a system, engineers can design more efficient and effective mechanical systems that can withstand...
Three-Dimensional Force System:Problem Solving01:30

Three-Dimensional Force System:Problem Solving

A three-dimensional force system refers to a scenario in which three forces act simultaneously in three different directions. This type of problem is commonly encountered in physics and engineering, where it is necessary to calculate the resultant force on the system, which can then be used to predict or analyze the behavior of the object or structure under consideration.
To solve a three-dimensional force system, first resolve each force into its respective scalar components. Do this using...
Muscles that Move the Arm01:31

Muscles that Move the Arm

Nine muscles are involved in arm movements. Two of these, the pectoralis major and latissimus dorsi, originate from the axial skeleton and are called axial muscles. The other seven originate from the scapula and are called the scapular muscles.
The pectoralis major has two origins. Its clavicular head originates on the medial half of the clavicle. In contrast, the sternocostal head originates on the costal cartilages of ribs 1-6, the sternum, and the aponeurosis of the external oblique of the...
Muscles that Move the Forearm01:16

Muscles that Move the Forearm

The muscles that move the forearms can be divided into four groups: forearm flexors, forearm extensors, forearm pronators, and forearm supinators. The flexors and extensors act on the elbow joint, while the pronators and supinators act on the radioulnar joints.
Forearm Flexors
The biceps brachii, brachialis, and brachioradialis are forearm flexors. The biceps brachii is made up of two heads. Its long head originates at the supraglenoid tubercle of the scapula, whereas that of the short head is...
Muscles of the Forearm that Move the Hand and Fingers01:16

Muscles 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,...

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Study Motor Skill Learning by Single-pellet Reaching Tasks in Mice
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Implicit motor sequence learning using three-dimensional reaching movements with the non-dominant left arm.

Charles R Smith1, Jessica F Baird2, Joelle Buitendorp1

  • 1Department of Exercise Science, Arnold School of Public Health, University of South Carolina, Columbia, SC, USA.

Experimental Brain Research
|October 8, 2024
PubMed
Summary

Individuals learn whole-arm motor sequences differently based on arm dominance. The non-dominant arm shows greater learning gains through straighter movements, while the dominant arm improves via speed.

Keywords:
DominanceImplicit sequence learningMotor learningReaching

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Area of Science:

  • Neuroscience
  • Motor Control
  • Human Movement Science

Background:

  • Interlimb differences in reach control can affect motor sequence learning.
  • Whole-arm movements are crucial for many daily tasks and sports.
  • Understanding how dominant and non-dominant limbs learn motor skills is important for rehabilitation and training.

Purpose of the Study:

  • To investigate the learning of a 3-dimensional whole-arm sequence task.
  • To compare motor learning between the dominant right arm and non-dominant left arm.
  • To identify differences in learning strategies employed by each arm.

Main Methods:

  • Thirty-one right-hand dominant adults practiced a virtual whole-arm sequence task over two days.
  • Participants used either their dominant right or non-dominant left arm.
  • Performance was measured by response time and kinematic variables (hand path distance, peak velocity).

Main Results:

  • Both arms improved performance, but the non-dominant left arm showed greater response time gains.
  • The left arm group improved by reducing hand path distance (straighter movements).
  • The right arm group improved via a combination of reduced hand path distance and increased peak velocity.

Conclusions:

  • Individuals can learn whole-arm motor sequences with their non-dominant arm.
  • Motor learning strategies differ between dominant and non-dominant arms.
  • Reach control differences influence the strategy adopted for learning whole-arm movements.