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The timing of visual cortex development is not dictated by retinal input. Neural activity in the developing visual cortex is homeostatically controlled and robust to the loss of primary sensory input.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Visual System Research

Background:

  • Mammalian isocortex shows increasing background activity during development.
  • This developmental transition is crucial for mature visual processing.
  • The factors regulating this critical developmental timing remain unknown.

Purpose of the Study:

  • To investigate the role of the retina, the primary input, in the development of continuous spontaneous activity in the mouse visual cortex.
  • To determine if the loss of retinal input affects the timing of cortical activity development.

Main Methods:

  • In vivo depth electrode recordings were used in enucleated mice.
  • Bilateral enucleation was performed at postnatal day 6.
  • Neural activity, firing rates, and oscillations were monitored through postnatal day 16.

Main Results:

  • Acute enucleation silenced the cortex, but activity and oscillations recovered within 2 days.
  • Enucleated mice showed transient differences in silent period duration and continuity.
  • An increase in low-frequency power persisted in enucleated animals.

Conclusions:

  • The timing of visual cortex activity development is independent of major driving input from the retina.
  • Developing visual cortex neural activity is under homeostatic control.
  • This homeostatic control is largely robust to the loss of primary sensory input.