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Related Concept Videos

Inertial Frames of Reference01:03

Inertial Frames of Reference

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 constant...
Non-inertial Frames of Reference01:27

Non-inertial Frames of Reference

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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Framing Effects

Information is everywhere and its presentation—such as how and when items are presented—can impact our perceptions and decisions surrounding the info. This broad concept umbrellas framing effects—influences that occur due to the way information is framed in its appearance, whether it’s purely the order or the specific wording of a message. Let’s take a look at numerous ways in which two versions of something can objectively say the same thing, yet we respond in different ways based on the...
Position and Displacement01:31

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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...
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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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Gestalt principles provide a framework for understanding how humans perceive objects as unified wholes within their context. These principles are essential in explaining the cognitive processes that make sense of complex visual stimuli by organizing them into coherent groups. One fundamental principle is proximity, which posits that objects located close to each other are perceived as a collective group. For instance, when dots are positioned near one another, the visual system interprets them...

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A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss
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Published on: April 11, 2025

Visual performance fields: frames of reference.

Jennifer E Corbett1, Marisa Carrasco

  • 1Departments of Psychology and Center for Neural Science, New York University, New York, New York, United States of America. jennifer.e.corbett@gmail.com

Plos One
|September 21, 2011
PubMed
Summary
This summary is machine-generated.

Visual performance fields are not fixed but shift with head tilt and eye fixation, demonstrating a strong link to egocentric reference frames and retinal location.

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Area of Science:

  • Visual perception
  • Human psychophysics
  • Neuroscience

Background:

  • Visual performance varies across the visual field, with better performance horizontally than vertically (Horizontal-Vertical Anisotropy, HVA) and inferiorly than superiorly (Vertical Meridian Asymmetry, VMA).
  • Previous studies aligned environmental and observer reference frames, limiting understanding of how spatial reference frame manipulations affect visual performance fields.

Purpose of the Study:

  • To investigate the impact of dissociating spatial reference frames on visual performance fields.
  • To quantify how head-centric and retinotopic coordinates influence the shape of visual performance fields.

Main Methods:

  • Participants performed visual discrimination tasks involving briefly presented radial arrays of Gabor stimuli.
  • Observers discriminated target tilt against distractor orientation under conditions of head tilt and varying fixation points.

Main Results:

  • Visual performance fields were observed to shift in response to head tilt.
  • Performance fields also shifted when observers changed their fixation point.
  • These shifts indicate that performance fields align with egocentric reference frames.

Conclusions:

  • Visual performance fields are dynamic and adaptable, not static.
  • The results demonstrate that visual performance is strongly tied to the egocentric reference frame, specifically the retinal location of stimuli.
  • Understanding these shifts is crucial for comprehending visual processing and spatial awareness.