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Related Concept Videos

Working Memory01:24

Working Memory

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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...
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The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
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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.
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Association Areas of the Cortex01:21

Association Areas of the Cortex

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Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
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Visual System01:26

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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.
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Related Experiment Video

Updated: Jul 2, 2025

A Cognitive Paradigm to Investigate Interference in Working Memory by Distractions and Interruptions
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Working memory signals in early visual cortex are present in weak and strong imagers.

Simon Weber1,2,3, Thomas Christophel1,4, Kai Görgen1,3

  • 1Bernstein Center for Computational Neuroscience Berlin and Berlin Center for Advanced Neuroimaging, Charité - Universitätsmedizin Berlin, corporate member of the Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany.

Human Brain Mapping
|February 24, 2024
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Summary

Working memory relies on early visual cortex signals, even without vivid visual imagery. Brain activity reconstruction was equally accurate for strong and weak imagers, challenging previous assumptions.

Keywords:
early visual cortexindividual differencesmultivariate decodingvisual imageryworking memory

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Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging
  • Visual Perception

Background:

  • Visual working memory and imagery are thought to involve early visual cortex.
  • A hypothesis suggests these visual cortex signals reflect a combined memory and imagery code.
  • This implies reduced imagery vividness should correlate with weaker memory signals.

Purpose of the Study:

  • To investigate if early visual cortex working memory signals differ between strong and weak visual imagers.
  • To test the prediction that weaker imagery leads to weaker memory representations in visual cortex.

Main Methods:

  • Participants were categorized as strong or weak visual imagers.
  • fMRI data was collected while participants performed a visual memory task over brief delay periods.
  • Machine learning was used to reconstruct memorized visual stimuli from early visual cortex activity.

Main Results:

  • Memorized visual stimuli were successfully reconstructed from early visual cortex activity in both groups.
  • Reconstruction quality was equally accurate for strong and weak imagers, contrary to the initial prediction.
  • Decodable information in visual cortex correlated with behavioral precision across the imagery spectrum.

Conclusions:

  • Working memory representations in early visual cortex are present regardless of phenomenal visual imagery vividness.
  • These visual cortex signals can support behavioral performance even in individuals with severely limited imagery (aphantasia).
  • The findings challenge the notion that vivid imagery is essential for visual working memory encoding in early visual areas.