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Related Concept Videos

Inertial Frames of Reference01:03

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Newton’s first law is usually considered to be a statement about reference frames. It provides a method for identifying a special type of reference frame: the inertial reference frame. In principle, we can make the net force on a body zero. If its velocity relative to a given frame is constant, then that frame is said to be inertial. So, by definition, an inertial reference frame is a reference frame where Newton's first law holds valid. Newton's first law applies to objects with...
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Non-inertial Frames of Reference01:27

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A reference frame accelerating or decelerating relative to an inertial frame is a non-inertial frame. To help understand this, consider what taking off in an airplane, turning a corner in a car, riding a merry-go-round, and the circular motion of a tropical cyclone all have in common. All these systems are accelerating, decelerating, or rotating relative to the Earth; hence, they all are non-inertial frames. All these systems exhibit inertial forces, which merely seem to arise from motion,...
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The Earth's shape is best described as an ellipsoid, a slightly flattened sphere created by rotating an ellipse around its minor axis. This flattening results in the polar axis being about 21 kilometers shorter than the equatorial axis. In contrast, the geoid represents the Earth's gravitational shape and aligns with the mean sea level (MSL). The geoid is an irregular equipotential surface where gravity is perpendicular at every point. Variations in Earth's mass distribution cause geoid...
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Spherical Coordinates01:23

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Spherical coordinate systems are preferred over Cartesian, polar, or cylindrical coordinates for systems with spherical symmetry. For example, to describe the surface of a sphere, Cartesian coordinates require all three coordinates. On the other hand, the spherical coordinate system requires only one parameter: the sphere's radius. As a result, the complicated mathematical calculations become simple. Spherical coordinates are used in science and engineering applications like electric and...
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Coordinates and Map Projections01:29

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Coordinates and map projections are essential tools in accurately representing the Earth's surface for various applications, ranging from navigation to spatial analysis. The latitude and longitude coordinate system is a universally recognized framework for defining locations. Latitude specifies the distance of a point north or south of the equator, measured in degrees from 0° at the equator to 90° at the poles. Longitude indicates a location's position east or west of the prime meridian,...
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Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
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Related Experiment Video

Updated: Mar 28, 2026

The Spatial Memory Game: Testing the Relationship Between Spatial Language, Object Knowledge, and Spatial Cognition
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Are All Spatial Reference Frames Egocentric? Reinterpreting Evidence for Allocentric, Object-Centered, or

Flavia Filimon1

  • 1Adaptive Behavior and Cognition, Max Planck Institute for Human Development Berlin, Germany ; Berlin School of Mind and Brain, Humboldt Universität zu Berlin Berlin, Germany.

Frontiers in Human Neuroscience
|December 24, 2015
PubMed
Summary

The brain primarily uses egocentric reference frames for spatial representation, even when considering object-centered or world-centered perspectives. This suggests a unified egocentric system underlies spatial cognition.

Keywords:
allocentriccognitive mapegocentricobject-centeredparietal sensorimotor transformationsperception and actionplace cellsspatial reference frames

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Area of Science:

  • Cognitive Neuroscience
  • Spatial Cognition
  • Neurobiology

Background:

  • Egocentric spatial reference frames are well-understood in neural representation.
  • The brain's use of allocentric, object-centered, or world-centered frames remains debated.

Purpose of the Study:

  • To review evidence for and against various spatial reference frames.
  • To propose a unified theory of spatial representation based on egocentric frames.

Main Methods:

  • Literature review of behavioral, neuropsychological, and neurophysiological studies.
  • Analysis of neuroimaging data.
  • Consideration of theoretical models and simulations.

Main Results:

  • Evidence for allocentric, object-centered, and world-centered frames is inconclusive.
  • Theoretical and empirical data support a dominant role for egocentric frames.

Conclusions:

  • All spatial representations may ultimately rely on egocentric reference frames.
  • This challenges existing models of spatial cognition and neural representation.