Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Curvilinear Motion: Rectangular Components01:23

Curvilinear Motion: Rectangular Components

Curvilinear motion characterizes the movement of a particle or object along a curved path, notably evident when envisioning a car navigating a winding road. If the car starts at point A, its position vector is established within a fixed frame of reference, where the ratio of the position vector to its magnitude signifies the unit vector pointing in the position vector's direction.
As the car advances, its position evolves over time. Quantifying the car's velocity involves computing the time...
Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

Consider a crane whose telescopic boom rotates with an angular velocity of 0.04 rad/s and angular acceleration of 0.02 rad/s2. Along with the rotation, the boom also extends linearly with a uniform speed of 5 m/s. The extension of the boom is measured at point D, which is measured with respect to the fixed point C on the other end of the boom. For the given instant, the distance between points C and D is 60 meters.
Here, in order to determine the magnitude of velocity and acceleration for point...
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...
Planar Rigid-Body Motion01:22

Planar Rigid-Body Motion

Understanding the movement of a rigid body in planar motion involves recognizing that every particle within this body is traversing a path that maintains a consistent distance from a specific plane. This concept is fundamental in the study of physics and mechanical engineering, and it allows us to comprehend better how objects move in space.
Planar motion is typically divided into three distinct categories. The first is rectilinear translation, demonstrated by a subway train that moves along...
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...
Curvilinear Motion: Normal and Tangential Components01:27

Curvilinear Motion: Normal and Tangential Components

When a car traverses a curved road, its motion can be elucidated by breaking it down into tangential and normal components. The car-centric coordinates attached to the vehicle move with it.
The positive direction of the t-axis aligns with the increasing position of the car along the curved path, denoted by the unit vector ut. Simultaneously, the n-axis, perpendicular to the t-axis, dissects the curved path into differential arc segments, each forming the arc of a circle with a radius of...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Evaluating stress distribution and clinical success in varied dental implant designs.

Bioinformation·2026
Same author

Modulating Propofol Requirement for Induction: The Impact of Different Time Intervals of Fentanyl Administration.

Journal of pharmacy & bioallied sciences·2025
Same author

A Combined Segmental Spinal Epidural Anesthesia Versus General Anesthesia for Breast Cancer Surgeries: A Randomized Comparative Study.

Journal of pharmacy & bioallied sciences·2025
Same author

Comparative Study of Intravenous vs Inhalational Maintenance Anaesthesia on Postoperative Emergence Agitation and Recovery Parameters After General Anaesthesia.

Journal of pharmacy & bioallied sciences·2025
Same author

Visual Distortions in Human Amblyopia Are Correlated with Deficits in Contrast Sensitivity.

The Journal of neuroscience : the official journal of the Society for Neuroscience·2025
Same author

Comparison of Segmental Thoracic and Lumbar Subarachnoid Block in Preeclamptic Patients Undergoing Cesarean Section: An Open-Label Randomized Trial.

Cureus·2025

Related Experiment Video

Updated: Jun 5, 2026

Motion-Acuity Test for Visual Field Acuity Measurement with Motion-Defined Shapes
06:25

Motion-Acuity Test for Visual Field Acuity Measurement with Motion-Defined Shapes

Published on: February 23, 2024

Discerning nonrigid 3D shapes from motion cues.

Anshul Jain1, Qasim Zaidi

  • 1Graduate Center for Vision Research, State University of New York College of Optometry, New York, NY 10036, USA. anshuljjain@gmail.com

Proceedings of the National Academy of Sciences of the United States of America
|January 6, 2011
PubMed
Summary

Human observers can perceive 3D shape from motion, even for deforming objects. This study shows relative velocity, not rigidity, is key for shape from motion perception, and practice improves detecting shape changes.

Related Experiment Videos

Last Updated: Jun 5, 2026

Motion-Acuity Test for Visual Field Acuity Measurement with Motion-Defined Shapes
06:25

Motion-Acuity Test for Visual Field Acuity Measurement with Motion-Defined Shapes

Published on: February 23, 2024

Area of Science:

  • Visual perception
  • Computational neuroscience
  • Cognitive psychology

Background:

  • Organisms and objects often deform nonrigidly during motion.
  • Perceiving 3D shape from motion requires separating shape changes from object movement.
  • Existing structure from motion models often rely on rigidity assumptions.

Purpose of the Study:

  • To measure observers' ability to infer nonrigid volumetric shapes from motion cues.
  • To evaluate computational models for shape from motion perception.
  • To investigate the role of rigidity assumptions versus motion deformations in visual perception.

Main Methods:

  • Psychophysical experiments measuring sensitivity to cross-section discrimination of rigid and flexing cylinders using motion cues.
  • Comparison of a motion perspective model against shape from motion factorization models.
  • Assessing the impact of practice on detecting inflation/deflation from motion.

Main Results:

  • Observers showed equal sensitivity discriminating cross-sections of flexing and rigid cylinders based on motion.
  • A motion perspective model outperformed factorization models in predicting human performance.
  • Asymmetric velocity profiles led to asymmetric perception of symmetric cylinders.
  • Inexperienced observers struggled to detect inflation/deflation, but practice improved performance for both rigid and nonrigid shapes.

Conclusions:

  • Human shape from motion perception relies on relative velocity and motion deformations, not rigidity assumptions.
  • Motion perspective is a crucial cue for inferring 3D shape from visual motion.
  • Training can enhance the ability to perceive dynamic shape changes from motion.