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Related Concept Videos

Vision01:24

Vision

Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
Sequence Networks of Rotating Machines01:24

Sequence Networks of Rotating Machines

A Y-connected synchronous generator, grounded through a neutral impedance, is designed to produce balanced internal phase voltages with only positive-sequence components. The generator's sequence networks include a source voltage that is exclusively in the positive-sequence network. The sequence components of line-to-ground voltages at the generator terminals illustrate this configuration.
Zero-sequence current induces a voltage drop across the generator's neutral impedance and other...
Visual System01:26

Visual System

Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
Once through the pupil, the light passes through the lens, a...
Color Vision01:24

Color Vision

Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
Gestalt Principles of Perception01:21

Gestalt Principles of Perception

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...
Visual Agnosia01:12

Visual Agnosia

Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round end"...

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Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
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Published on: April 16, 2014

The mental representation of ordered sequences in visual neglect.

Laura Zamarian1, Christl Egger, Margarete Delazer

  • 1Department of Psychology, University of Trieste, Trieste, Italy. zamarian@psico.units.it

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|July 13, 2007
PubMed
Summary

Left spatial neglect can affect number line representation, particularly with small numbers. This study found spatial biases in number, letter, and day bisection tasks for patients with neglect.

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Area of Science:

  • Cognitive Neuroscience
  • Neuropsychology

Background:

  • Left spatial neglect is increasingly recognized in abstract mental representations, including the mental number line.
  • Previous research (Zorzi et al., 2002) indicated neglect-related disruptions in numerical processing.

Purpose of the Study:

  • To replicate and extend findings on left spatial neglect's impact on mental number line representation.
  • To investigate neglect's effect on bisection tasks involving numbers (1-100), letters, days, and months.

Main Methods:

  • Five patients with left spatial neglect and 20 healthy controls performed mental bisection tasks.
  • Tasks involved verbally presented intervals for numbers, letters, days of the week, and months of the year.
  • Participants estimated the midpoint of each interval.

Main Results:

  • Left spatial neglect disrupted mental bisection of numerical intervals, especially with small numbers (1-9).
  • Performance in numerical tasks was influenced by interval size, with longer intervals causing right-sided errors.
  • Spatial biases were observed in letter and day bisection tasks, but not in the months task.

Conclusions:

  • Spatial mental representations appear to exist for small numbers, but not consistently for larger numbers.
  • Left spatial neglect can induce directional biases in abstract sequential representations like letters and days.
  • The findings suggest that neglect's influence on mental representations is domain-specific and depends on the nature of the representation.