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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,...
Absolute Motion Analysis- General Plane Motion01:24

Absolute Motion Analysis- General Plane Motion

Visualize a drone, with its propellers spinning rapidly, hovering mid-air. The fascinating movements and operations of this drone can be comprehended by applying the principle of general plane motion.
As the drone's propellers rotate, an upward force is generated that counteracts the force of gravity, enabling the drone to lift off from the ground. This initial movement of the drone is along a straight path, representing a form of translational motion. In this phase, every point on the drone...
Upward Impending Motion01:21

Upward Impending Motion

A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. Its operation is based on converting the force applied at its handle into a torsional moment, causing the upward impending motion of the screw. This movement is accomplished by overcoming the static friction between the threads of the screw and the jack.
To better comprehend how a screw jack functions, consider the completely unraveled thread as a block in contact with the...
Relative Motion Analysis - Velocity01:24

Relative Motion Analysis - Velocity

A stroke engine has a slider-crank mechanism that converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider.
When an external force is exerted, it sets the crank into a rotational movement. This, in turn, instigates the motion of the connecting rod, leading to what is referred to as a general plane motion. This process involves two key points - point A on the connecting rod...
Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
However, to express the relative position of point B relative to point A, an additional frame of reference, denoted as x'y', is necessary. This additional frame not only translates but also rotates relative to the fixed frame, making it instrumental in...
Motional Emf01:22

Motional Emf

Magnetic flux depends on three factors: the strength of the magnetic field, the area through which the field lines pass, and the field's orientation with respect to the surface area. If any of these quantities vary, a corresponding variation in magnetic flux occurs. If the area through which the magnetic field lines are passing changes, then the magnetic flux also changes. This change in the area can be of two types: the flux through the rectangular loop increases as it moves into the magnetic...

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Related Experiment Video

Updated: May 31, 2026

Corticospinal Excitability Modulation During Action Observation
12:33

Corticospinal Excitability Modulation During Action Observation

Published on: December 31, 2013

Hand in motion reveals mind in motion.

Jonathan B Freeman1, Rick Dale, Thomas A Farmer

  • 1Department of Psychology, Tufts University Medford, MA, USA.

Frontiers in Psychology
|June 21, 2011
PubMed
Summary

Researchers are using hand movements to understand cognitive processes in real-time. Hand-tracking offers high-fidelity insights into the mind, bridging various areas of psychological science.

Area of Science:

  • Cognitive Psychology
  • Cognitive Neuroscience
  • Human-Computer Interaction

Background:

  • Measuring hand movements during decision-making is a recent approach to studying psychological processes.
  • Manual actions can reveal the real-time dynamics of cognitive processing.
  • Existing research explores how motor actions reflect underlying mental states.

Purpose of the Study:

  • To review the growing body of research on using hand movements to understand cognitive dynamics.
  • To explain how manual actions serve as real-time indicators of cognitive processing.
  • To highlight the potential of hand-tracking as a tool for psychological research.

Main Methods:

  • Review of studies measuring hand movements during choice tasks.
  • Analysis of how hand motions index tentative commitments to choices.
Keywords:
handmotormouse-trackingreal-timetemporal dynamicstime-course

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  • Utilizing hand-tracking technology to capture continuous motor data.

    • Main Results:

    • Hand movements provide high-fidelity, real-time motor traces of cognitive processes.
    • Simple hand motions can continuously index evolving behavioral responses and choice commitments.
    • This methodology offers novel insights into the unfolding of decision-making.

    Conclusions:

    • Hand-tracking offers a powerful, non-invasive method to study cognitive dynamics.
    • Motor traces of the mind can illuminate a wide range of psychological phenomena.
    • This approach can bridge diverse fields within psychological science, including language, cognition, learning, and social processes.