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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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Related Experiment Video

Updated: Nov 12, 2025

Author Spotlight: Deciphering Neural Circuit Formation from Two-Photon Microscopy and Single Neuron Imaging
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Adaptation of spontaneous activity in the developing visual cortex.

Marina E Wosniack1,2, Jan H Kirchner1,2, Ling-Ya Chao1

  • 1Computation in Neural Circuits Group, Max Planck Institute for Brain Research, Frankfurt, Germany.

Elife
|March 16, 2021
PubMed
Summary
This summary is machine-generated.

Spontaneous brain activity patterns organize neural connections during development. Local and global activity, along with adaptive global event amplitude, refine visual cortex sensitivity before eye-opening.

Keywords:
adaptationdevelopmentmouseneurosciencespontaneous activitysynaptic plasticityvisual cortex

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Systems Neuroscience

Background:

  • Spontaneous neural activity is crucial for establishing brain connectivity during development.
  • The developing mouse primary visual cortex exhibits two distinct spontaneous activity patterns: local retinal and global cortical events.

Purpose of the Study:

  • To investigate how distinct spontaneous activity patterns jointly organize network connectivity via plasticity rules.
  • To determine the specific roles of local and global activity in shaping cortical circuits.

Main Methods:

  • Analysis of in vivo spontaneous cortical activity in mice.
  • Modeling of activity-dependent plasticity rules to understand network organization.

Main Results:

  • Local events were found to shape cortical input selectivity and topography.
  • Global events were postulated to homeostatically regulate connection strength.
  • Global event amplitude adaptation to preceding cortical activation history is necessary for robust selectivity.

Conclusions:

  • The developing visual cortex exhibits adaptive mechanisms in spontaneous activity.
  • Activity-dependent plasticity refines network connectivity for future sensory processing.
  • This developmental process enables the visual cortex to become sensitive to visual input after eye-opening.