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Related Concept Videos

Working Memory01:24

Working Memory

Working memory refers to a combination of components, including short-term memory and attention, that allow an individual to hold information temporarily as we perform cognitive tasks. It is an essential cognitive function that enables the execution of complex tasks such as problem-solving, comprehension, and reasoning. Unlike short-term memory, which simply involves the storage of information for a brief period, working memory involves the active manipulation and processing of this information.
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"...
Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

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.
Perceptual Constancy01:12

Perceptual Constancy

Perceptual constancy is the ability to recognize that objects remain consistent and unchanged even when their appearance varies due to changes in sensory input. There are four main types of perceptual constancy: size constancy, shape constancy, color constancy, and brightness constancy.
Size constancy is the recognition that an object remains the same size, even when its image on the retina changes. For instance, a bus is perceived to be large enough to carry people, even if it looks tiny from...
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...

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Related Experiment Video

Updated: May 16, 2026

Assessing Working Memory in Children: The Comprehensive Assessment Battery for Children – Working Memory (CABC-WM)
09:05

Assessing Working Memory in Children: The Comprehensive Assessment Battery for Children – Working Memory (CABC-WM)

Published on: June 12, 2017

Variability in the quality of visual working memory.

Daryl Fougnie1, Jordan W Suchow, George A Alvarez

  • 1Department of Psychology, Harvard University, William James Hall, 33 Kirkland Street, Cambridge, Massachusetts 02138, USA. darylfougnie@gmail.com

Nature Communications
|November 29, 2012
PubMed
Summary
This summary is machine-generated.

Working memory capacity is not fixed. New research reveals significant within-person variability in working memory quality, challenging existing cognitive models.

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Related Experiment Videos

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Area of Science:

  • Cognitive Psychology
  • Neuroscience

Background:

  • Working memory (WM) is crucial for cognition, enabling temporary information storage.
  • Existing models assume WM capacity is fixed for an individual, though it varies between people.

Purpose of the Study:

  • To investigate the variability of working memory representation quality within individuals.
  • To challenge the fixed-capacity assumption of standard WM models.

Main Methods:

  • The study examined the quality of working memory representations.
  • Statistical analyses were performed to identify sources of variability.

Main Results:

  • Substantial variability in working memory representation quality was observed within individuals.
  • This variability could not be explained by attention, arousal, or resource allocation models.

Conclusions:

  • Standard cognitive models of working memory capacity are insufficient.
  • A novel framework proposing a stochastic degradation process for WM limitations is introduced.