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Related Concept Videos

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Lateralization

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Brain lateralization refers to the division of mental processes and functions between the two hemispheres of the brain, a phenomenon that optimizes neural efficiency and underpins complex abilities in humans. This specialization allows each hemisphere to perform tasks where it has a comparative advantage, facilitating more refined cognitive capabilities across different domains.
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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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The human brain, a complex organ, is functionally divided into two cerebral hemispheres—left and right. These hemispheres are interconnected by a structure of paramount importance, the corpus callosum. This substantial bundle of neural fibers is not just a bridge between the hemispheres but a crucial element for the brain's comprehensive functioning. It enables efficient communication between the two hemispheres, allowing each side of the brain to control and receive sensory and motor...
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Related Experiment Video

Updated: Jul 4, 2025

Central and Divided Visual Field Presentation of Emotional Images to Measure Hemispheric Differences in Motivated Attention
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Contralateral delay activity and alpha lateralization reflect retinotopic and screen-centered reference frames in

Wanja A Mössing1, Svea C Y Schroeder1, Anna Lena Biel1

  • 1Institute of Psychology, University of Münster, Germany; Otto-Creutzfeldt-Center for Cognitive and Behavioral Neuroscience, University of Münster, Germany.

Progress in Neurobiology
|February 3, 2024
PubMed
Summary
This summary is machine-generated.

Visual short-term memory (VSTM) maintains object locations using retinotopic coordinates, unaffected by eye movements. Post-saccade brain activity indicates attention, not memory, is retinotopic.

Keywords:
CapacityEEGEye movementsRemappingVisual short-term memory

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • The brain processes visual information with contralateral hemispheres for left and right visual fields.
  • Visual short-term memory (VSTM) shows lateralization via contralateral delay activity (CDA) and alpha-band activity.
  • The reference frame (gaze-centered vs. screen-centered) for VSTM object location is debated, particularly after eye movements.

Purpose of the Study:

  • To investigate whether VSTM represents object locations in retinotopic or spatiotopic coordinates after saccades.
  • To differentiate the reference frames used by CDA and alpha-band activity during VSTM maintenance.

Main Methods:

  • Two experiments involved participants encoding object colors and performing lateral saccades during memory maintenance.
  • Change detection tasks assessed memory for object locations after saccades.
  • Electrophysiological measures, including CDA and alpha-band lateralization, were recorded.

Main Results:

  • CDA consistently showed lateralization toward the object's original retinotopic location, irrespective of saccades.
  • Alpha-band lateralization shifted towards the screen center post-saccade, even in non-memory tasks.
  • CDA polarity did not invert despite saccades shifting retinal locations.

Conclusions:

  • VSTM maintains object locations in a retinotopic reference frame, as evidenced by CDA.
  • Post-saccade alpha-band lateralization reflects attentional shifts, not VSTM content.
  • The findings clarify the reference frame utilized by VSTM during dynamic visual processing.