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Related Concept Videos

Torque01:10

Torque

Torque is an important quantity for describing the dynamics of a rotating rigid body. We see the application of torque in many ways in the world, such as when pressing the accelerator in a car, which causes the engine to apply additional torque on the drivetrain. Here, we define torque and provide a framework to create an equation to calculate torque for a rigid body with fixed-axis rotation.
Torque can be considered as the rotational counterpart to force. Since forces change the translational...
Net Torque Calculations01:19

Net Torque Calculations

When a mechanic tries to remove a hex nut with a wrench, it is easier if the force is applied at the farthest end of the wrench handle. The lever arm is the distance from the pivot point (the hex nut in this case) to the person’s hand. If this distance is large, the torque is higher. Only the component of the force perpendicular to the lever arm contributes to the torque. Therefore, pushing the wrench perpendicular to the lever arm is more advantageous. If multiple people apply force to rotate...
Factors Affecting Perception01:25

Factors Affecting Perception

Perception is influenced by perceptual set, context, motivation, and emotion. Perceptual set, or perceptual expectancy, refers to the tendency to perceive things in a particular way, influenced by previous experiences and expectations. This phenomenon affects the interpretation of stimuli, creating a set of mental tendencies and assumptions that impact sensory perceptions of sound, taste, touch, and sight.
An illustrative example of a perceptual set is the scenario where an airline pilot told...
Torque Free Motion01:15

Torque Free Motion

The torque-free motion refers to the movement of a rigid body in space when no external torques are acting upon it. This type of motion can be observed in environments where there are no external forces or frictions, like in outer space. For example, a rotation of Mars in space is a torque-free motion. Mars is an axisymmetric object, meaning it has an axis of symmetry along which it rotates, designated as the z-axis. The rotating frame of reference is defined such that the center of mass of...
Electro-mechanical Systems01:19

Electro-mechanical Systems

Electromechanical systems are intricate configurations that effectively combine electrical and mechanical elements to achieve a desired outcome. Central to many of these systems is the DC motor, a device that converts electrical energy into mechanical motion, enabling various applications ranging from simple fans to complex robotic mechanisms.
A key component of the DC motor is the armature, a rotating circuit positioned within a magnetic field. As an electric current passes through the...
Frictional Forces on Screws01:17

Frictional Forces on Screws

Screws are characterized by a helical ridge known as a thread wrapped around a cylindrical shaft. They are commonly used as fasteners to hold objects together or to transmit power and motion in machines. One type of screw that is particularly useful for transmitting power is the square-threaded screw.
A jack with a square-threaded screw is a mechanical device used to lift heavy loads by applying a force at its handle. When the force is applied, the screw turns, raising the load. The screw can...

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Related Experiment Video

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Applying Incongruent Visual-Tactile Stimuli during Object Transfer with Vibro-Tactile Feedback
05:43

Applying Incongruent Visual-Tactile Stimuli during Object Transfer with Vibro-Tactile Feedback

Published on: May 23, 2019

Visual influence on haptic torque perception.

Yangqing Xu1, Shélan O'Keefe, Satoru Suzuki

  • 1Department of Psychology, Northwestern University, 2029 Sheridan Road, Evanston, IL 60208, USA. xuy@u.northwestern.edu

Perception
|November 20, 2012
PubMed
Summary
This summary is machine-generated.

Visual information significantly impacts torque perception, even when known to be unreliable. This study explores how the brain integrates conflicting visual and haptic sensory data.

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Last Updated: May 16, 2026

Applying Incongruent Visual-Tactile Stimuli during Object Transfer with Vibro-Tactile Feedback
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Published on: May 23, 2019

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Area of Science:

  • Neuroscience
  • Sensory Perception
  • Human-Computer Interaction

Background:

  • The brain integrates simultaneous sensory inputs into a unified perception.
  • Perceptual conflicts across senses are resolved by modality weighting, often task-dependent.
  • Visual-haptic conflicts commonly affect judgments of object properties like size, texture, and weight.

Purpose of the Study:

  • To investigate a novel haptic-visual conflict in the perception of torque.
  • To determine the influence of visual information on haptic torque judgments under conflict.
  • To examine if visual unreliability affects the weighting of visual versus haptic torque information.

Main Methods:

  • Participants held an object with unbalanced left-right torque.
  • Participants viewed a potentially mirror-reversed image of the object.
  • Torque perception was assessed under conditions of visual-haptic conflict.

Main Results:

  • Visual information significantly influenced haptic torque perception.
  • This visual influence persisted even when participants knew the visual data was unreliable.
  • The findings challenge the assumption that proximal haptic information always dominates torque perception.

Conclusions:

  • Visual input exerts a strong influence on haptic torque perception, overriding expectations of haptic dominance.
  • The brain's integration of conflicting sensory information is complex and not solely based on sensory reliability or proximity.
  • Further research is needed to understand the neural mechanisms underlying cross-modal torque perception and conflict resolution.