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Related Concept Videos

Position and Displacement01:31

Position and Displacement

The position of an object defines its location relative to a convenient frame of reference at any particular time. A frame of reference is an arbitrary set of axes from which the position and motion of an object are described. Earth is often used as a frame of reference, and we often describe the position of an object as it relates to stationary objects on Earth. For example, a rocket launch could be described in terms of the position of the rocket with respect to Earth as a whole. On the other...
Position and Displacement01:31

Position and Displacement

The position of an object defines its location relative to a convenient frame of reference at any particular time. A frame of reference is an arbitrary set of axes from which the position and motion of an object are described. Earth is often used as a frame of reference, and we often describe the position of an object as it relates to stationary objects on Earth. For example, a rocket launch could be described in terms of the position of the rocket with respect to Earth as a whole. On the other...
Curvilinear Motion: Polar Coordinates01:27

Curvilinear Motion: Polar Coordinates

In polar coordinates, the motion of a particle follows a curvilinear path. The radial coordinate symbolized as 'r,' extends outward from a fixed origin to the particle, while the angular coordinate, 'θ,' measured in radians, represents the counterclockwise angle between a fixed reference line and the radial line connecting the origin to the particle.
The particle's location is described using a unit vector along the radial direction. Deriving the particle's position with respect to time...
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...
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...
Position and Displacement Vectors01:00

Position and Displacement Vectors

To describe the motion of an object, one should first be able to describe its position (where it is at any particular time). More precisely, the position needs to be specified relative to a convenient frame of reference. A frame of reference is an arbitrary set of axes from which the position and motion of an object are described. Earth is often used as a frame of reference to describe the position of an object in relation to stationary objects on Earth.
Further, several important kinds of...

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Illusory position shift induced by plaid motion.

Rumi Hisakata1, Ikuya Murakami

  • 1Department of Life Sciences, University of Tokyo, Tokyo, Japan. hisakata@fechner.c.u-tokyo.ac.jp

Vision Research
|September 22, 2009
PubMed
Summary

Motion-induced position shift (MIPS) occurs with plaid patterns, but the global effect isn't just the average of component motions. This suggests a unique global motion detection mechanism.

Area of Science:

  • Visual perception
  • Neuroscience
  • Motion perception

Background:

  • Motion-induced position shift (MIPS) describes the perceived shift of a moving pattern within a stationary envelope.
  • Previous research indicates MIPS is influenced by pattern motion direction.

Purpose of the Study:

  • To investigate MIPS in response to plaid and pseudo plaid patterns.
  • To determine if global MIPS can be predicted by the sum of local MIPS from component motions.

Main Methods:

  • Presenting plaid and pseudo plaid patterns to observers.
  • Measuring perceived shifts in pattern position.
  • Comparing global MIPS with the average of local MIPS from component motions.

Main Results:

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  • Plaid motion elicited a global MIPS in the direction of overall motion.
  • This global MIPS could not be predicted by averaging the local MIPS of component motions.
  • Similar results were found with pseudo plaid patterns, indicating a global motion processing mechanism.

Conclusions:

  • Global motion perception, specifically MIPS, involves mechanisms beyond simple averaging of component motion cues.
  • A potential explanation involves the shifting receptive fields of global motion detectors.
  • This shift, possibly in the direction opposite to global motion, could explain the observed positional displacement through population coding.