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Related Concept Videos

Method of Joints: Problem Solving II01:30

Method of Joints: Problem Solving II

Consider a truss structure with frictionless joints fixed to a wall and roller support. If a force of 150 N is applied to joint A, the forces in each member of the truss can be determined using the method of joints.
Support Reactions in Three Dimensions01:27

Support Reactions in Three Dimensions

Support reactions in three dimensions help maintain the stability and equilibrium of various structures and systems. These reactions prevent the system from translating and rotating, ensuring the design can withstand external forces and perform its intended function efficiently and safely. Some of the supports providing support reactions in three dimensions are discussed below:
Ball and Socket Joint is one of the supports allowing free rotation about any axis. This freedom of rotation is...
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Muscle 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.
Method of Joints: Problem Solving I01:30

Method of Joints: Problem Solving I

The method of joints is a commonly used technique to analyze the forces in structural trusses. The method is based on the principle of equilibrium, which assumes that the truss members are connected by frictionless pins. The forces at each joint can be determined by considering the equilibrium of the forces acting on that joint. Consider a truss structure with two forces of 20 N and 10 N acting at joints C and D, respectively. The method of joints can be used to determine the forces FCB, FDC,...
Dose-Response Relationship: Selectivity and Specificity01:25

Dose-Response Relationship: Selectivity and Specificity

Drugs exert their therapeutic effects by interacting with receptors, enzymes, or ion channels that are present throughout the human body. The strength and duration of the interaction between a drug and its target receptor are characterized by the selectivity and specificity of the drug. Selectivity refers to a drug's strong preference for its intended target over other targets. For instance, isoprenaline, a non-selective β-adrenergic agonist, interacts with both β1- and β2-adrenergic receptors...
Functional Classification of Joints01:09

Functional Classification of Joints

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 immobile...

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Related Experiment Video

Updated: May 30, 2026

A Modified Lean and Release Technique to Emphasize Response Inhibition and Action Selection in Reactive Balance
07:19

A Modified Lean and Release Technique to Emphasize Response Inhibition and Action Selection in Reactive Balance

Published on: March 19, 2020

Response selection during a joint action task.

Matthew Ray1, Timothy N Welsh

  • 1Faculty of Physical Education and Health, University of Toronto, Canada. matthew.ray@utoronto.ca

Journal of Motor Behavior
|July 22, 2011
PubMed
Summary
This summary is machine-generated.

In joint action tasks, individuals anticipate coactor needs to improve task efficiency. This study shows participants predicted confederate needs, passing a jug with the handle available 86% of the time.

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Area of Science:

  • Cognitive Psychology
  • Social Neuroscience
  • Human-Computer Interaction

Background:

  • Joint action requires coordinating actions with others.
  • Predicting a coactor's needs is crucial for seamless collaboration.
  • Shared task representations may facilitate predictive coordination.

Purpose of the Study:

  • To investigate if individuals predict coactor needs in a joint action task.
  • To determine if these predictions influence response selection.
  • To examine the role of shared representations in collaborative tasks.

Main Methods:

  • Participants engaged in a joint action task involving passing a jug to a confederate.
  • The task involved varying conditions to assess predictive strategies.
  • Performance was measured by the jug's orientation upon transfer.

Main Results:

  • The jug was passed with the handle available to the confederate in 86% of trials.
  • This outcome supports the hypothesis of predictive coactor need assessment.
  • Results suggest a strategy prioritizing overall task efficiency.

Conclusions:

  • Individuals utilize predictive mechanisms to anticipate coactor needs in joint actions.
  • This predictive capability enhances the efficiency of collaborative tasks.
  • Shared task representations likely underpin successful joint action coordination.