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Vision01:24

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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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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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The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle...
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Updated: Jun 29, 2025

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity
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Developmentally sensitive multispectral cortical connectivity profiles serving visual selective attention.

Jake J Son1, Abraham D Killanin1, Yasra Arif2

  • 1Institute for Human Neuroscience, Boys Town National Research Hospital, Boys Town, NE, USA; College of Medicine, University of Nebraska Medical Center, Omaha, NE, USA; Center for Pediatric Brain Health, Boys Town National Research Hospital, Boys Town, NE, USA.

Developmental Cognitive Neuroscience
|April 6, 2024
PubMed
Summary
This summary is machine-generated.

Brain connectivity supporting selective attention changes during childhood. Researchers studied youth aged 6-13, finding key brain regions show developmental sensitivity, particularly during the pubertal transition.

Keywords:
AlphaDevelopmentMEGMagnetoencephalographyOscillatory dynamics

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Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Cognitive Science

Background:

  • The developing brain undergoes significant changes throughout childhood and adolescence, impacting cognitive functions like selective attention.
  • Selective attention is vital for executive functions, but age-related neural dynamics and connectivity in its supporting brain regions are not well understood.

Purpose of the Study:

  • To investigate the developmental sensitivity of selective attention neural circuitry in typically developing youth.
  • To identify age-related changes in neural oscillatory dynamics and connectivity within brain regions supporting selective attention.

Main Methods:

  • Magnetoencephalography (MEG) was used to record brain activity in 91 participants aged 6-13 years during a number-based Simon task.
  • Time-frequency analysis and beamforming techniques were applied to identify significant oscillatory brain responses.
  • Whole-brain connectivity analyses were performed using peak voxels in occipital, parietal, and cerebellar cortices as seeds, focusing on alpha and gamma frequency bands.

Main Results:

  • Developmentally sensitive connectivity patterns were observed in brain regions critical for selective attention.
  • Specific findings include altered connectivity in the temporoparietal junction (alpha band) and prefrontal cortex (gamma band) with age.
  • These results indicate significant changes in neural communication supporting selective attention during development.

Conclusions:

  • Brain regions involved in selective attention exhibit high sensitivity to developmental changes, especially during the pubertal transition.
  • The study highlights the dynamic nature of neural networks supporting cognitive functions throughout childhood and adolescence.
  • Findings contribute to understanding the neural basis of cognitive maturation and executive function development.