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Related Concept Videos

Structural Joints: Synovial Joints01:16

Structural Joints: Synovial Joints

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Synovial joints are the most common type of joint in the body. A key structural characteristic for a synovial joint is the presence of a joint cavity. This fluid-filled space is where the articulating surfaces of the bones contact each other. Also, unlike fibrous or cartilaginous joints, the articulating bone surfaces at a synovial joint are not directly connected to each other with fibrous connective tissue or cartilage. This gives the bones of a synovial joint the ability to move smoothly...
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Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy01:26

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This lesson explores three gastrointestinal imaging techniques: radionuclide testing, colonic transit studies, and virtual colonoscopy.
Radionuclide Testing
Radionuclide testing is a sophisticated medical technique for assessing gastrointestinal motility. It focuses on gastric emptying and colonic transit time. Radioactive markers track the movement of food through the digestive system, providing insights into gastrointestinal disorders.
In gastric emptying studies, a meal's liquid and...
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Structural Joints: Fibrous Joints01:03

Structural Joints: Fibrous Joints

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Fibrous joints are a type of joint where the bones are connected by fibrous connective tissue. These joints provide stability and minimal to no movement between the articulating bones. There are three types of fibrous joints.
Suture
All the bones of the skull, except for the mandible, are joined to each other by a fibrous joint called a suture. The fibrous connective tissue found at a suture strongly unites the adjacent skull bones and thus helps to protect the brain and form the face. In...
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Structural Joints: Cartilaginous Joints01:17

Structural Joints: Cartilaginous Joints

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As the name indicates, at a cartilaginous joint, the adjacent bones are united by cartilage, a tough but flexible type of connective tissue. Unlike synovial joints, these types of joints lack a joint cavity and involve bones joined together by either hyaline cartilage or fibrocartilage.
There are two types of cartilaginous joints:
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A synchondrosis ("joined by cartilage") is a cartilaginous joint where bones are connected by hyaline cartilage. Synchondrosis may be temporary...
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Joints01:26

Joints

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Joints, also called articulations or articular surfaces, are points at which ligaments or other tissues connect adjacent bones. Joints permit movement and stability, and can be classified based on their structure or function.
Structural joint classifications are based on the material that makes up the joint as well as whether or not the joint contains a space between the bones. Joints are structurally classified as fibrous, cartilaginous, or synovial.
Fibrous Joints Are Immovable
The bones of a...
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Virtual Work01:20

Virtual Work

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The principle of virtual work states that if a body is in static and dynamic equilibrium, then the sum of all the virtual work done by all external forces and couple moments for any given virtual displacement must be zero.
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Related Experiment Video

Updated: Jan 25, 2026

A Methodology for Capturing Joint Visual Attention Using Mobile Eye-Trackers
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Joint Attention Virtual Classroom: A Preliminary Study.

Seung-Hun Seo1, Eunjoo Kim2, Peter Mundy3

  • 1Department of Computer Science, Hanyang University, Seoul, Republic of Korea.

Psychiatry Investigation
|May 3, 2019
PubMed
Summary

This study developed a joint attention virtual reality (JA-VR) classroom, enhancing social attention in virtual learning environments. The JA-VR classroom improved attentional processing compared to traditional methods.

Keywords:
Attentional processingContinuous performance taskHead mounted displayJoint attentionVirtual reality

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Area of Science:

  • Neuroscience
  • Virtual Reality Technology
  • Educational Psychology

Background:

  • Virtual classrooms offer immersive and ecologically valid neuropsychological assessments.
  • Existing virtual classroom studies lack sufficient social attention components.
  • Social attention is crucial for learning and development.

Purpose of the Study:

  • To develop a novel joint attention virtual reality (JA-VR) classroom.
  • To integrate social attention elements between participants and virtual avatars.
  • To enhance the ecological validity of virtual reality assessments.

Main Methods:

  • Developed a JA-VR classroom incorporating social attention features.
  • Compared the JA-VR classroom with a standard VR classroom lacking joint attention.
  • Utilized the AX-version of continuous performance tasks for attention experiments.
  • Recruited 58 participants for pilot and main study phases.

Main Results:

  • The JA-VR classroom demonstrated convergent validity with existing assessment methods.
  • Participants showed improved attentional processing in the JA-VR classroom compared to standard VR and non-VR measures.
  • The integration of joint attention significantly enhanced performance.

Conclusions:

  • The JA-VR classroom successfully incorporates social attention into virtual learning environments.
  • This methodology provides a foundation for studying social attention in educational contexts.
  • The JA-VR classroom has the potential to aid individuals with social attention deficits.