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Related Concept Videos

Velocity of an Object01:18

Velocity of an Object

Understanding how an object moves along a path requires distinguishing between motion over a time span and motion at a precise moment. A useful example is a vehicle traveling along a straight and level path, where its position at any given time is known. The initial step in analyzing this motion is to measure how far the vehicle travels over a fixed time period. This measurement, called average velocity, is computed by dividing the total change in position by the duration over which the change...
Instantaneous Velocity - II01:10

Instantaneous Velocity - II

Instantaneous velocity is the quantity that measures how fast an object is moving along its path. In other words, the instantaneous velocity of an object is the limit of the average velocity as the elapsed time approaches zero, or the derivative of displacement with respect to time. Like average velocity, the instantaneous velocity is a vector with the dimensions of length per unit time. Instantaneous velocity can have both positive and negative values. The instantaneous velocity can be...
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...
Average and Instantaneous Velocity Vectors01:12

Average and Instantaneous Velocity Vectors

To calculate other physical quantities in kinematics, the time variable must be introduced. The time variable not only allows us to state where an object is (its position) during its motion, but also how fast it’s moving. The speed at which an object is moving is given by the rate at which the position changes with time. For each position, a particular time is assigned. If the details of the motion at each instant are not important, the rate is usually expressed as the average velocity v. This...
Average Velocity01:12

Average Velocity

To calculate the other physical quantities in kinematics, we must introduce the time variable. The time variable allows us not only to state the position of the object during its motion, but also how fast it is moving. The speed at which an object is moving is given by the rate at which the position changes with time. For each position xi, we assign a particular time ti. If the details of the motion at each instant are not important, the rate is usually expressed as the average velocity. This...
Relative Velocity in One Dimension01:10

Relative Velocity in One Dimension

The understanding of the concept of reference frames is essential to discuss relative motion in one or more dimensions. When we say that an object has a certain velocity, we must state the velocity with respect to a given reference frame. In most examples, this reference frame has been Earth. For instance, if a statement reads that a person is sitting in a train moving at 10 m/s east, then it implies that the person on the train is moving relative to the surface of Earth at this velocity,...

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High-speed Particle Image Velocimetry Near Surfaces
11:59

High-speed Particle Image Velocimetry Near Surfaces

Published on: June 24, 2013

Typical object velocity influences motion extrapolation.

Alexis D J Makin1, Andrew J Stewart, Ellen Poliakoff

  • 1School of Psychological Sciences, University of Manchester, Manchester, UK.

Experimental Brain Research
|January 14, 2009
PubMed
Summary
This summary is machine-generated.

Object motion extrapolation is influenced by past experiences. Even when target speeds are identical, perceived speed differs based on learned object categories, affecting visual perception.

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Area of Science:

  • Cognitive psychology
  • Neuroscience
  • Visual perception

Background:

  • Previous research shows immediate prior trial velocity impacts motion extrapolation.
  • The influence of longer-term velocity representations on motion extrapolation remains less understood.

Purpose of the Study:

  • To investigate if longer-term velocity representations, beyond immediate trial history, affect visual motion extrapolation.
  • To determine if learned associations between stimulus categories and velocities influence motion perception.

Main Methods:

  • Participants extrapolated the motion of targets (red, blue, green) disappearing behind an occluder.
  • Targets varied in typical velocity ranges: red (slow), blue (medium), green (fast).
  • Responses on red and green trials with identical 20 deg/s velocities were compared to assess perceptual bias.

Main Results:

  • Participants perceived identical 20 deg/s green targets as moving faster (M = 22.64 deg/s) than identical 20 deg/s red targets (M = 19.72 deg/s).
  • This suggests a bias in motion extrapolation based on learned category-specific velocities.

Conclusions:

  • Motion extrapolation is influenced not only by immediate velocity cues but also by longer-term, category-based velocity expectations.
  • Learned associations between visual stimuli categories and their typical velocities create a persistent bias in motion perception.