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Synaptic refinement during development and its effect on slow-wave activity: a computational study.

Erik P Hoel1, Larissa Albantakis2, Chiara Cirelli2

  • 1Department of Psychiatry, University of Wisconsin-Madison, Madison, Wisconsin; and Neuroscience Training Program, University of Wisconsin-Madison, Madison, Wisconsin.

Journal of Neurophysiology
|February 5, 2016
PubMed
Summary
This summary is machine-generated.

Synaptic refinement, a process of neural reorganization, explains the developmental decrease in sleep slow-wave activity (SWA) in adolescent rodents. This finding suggests SWA can noninvasively track brain development.

Keywords:
cortical organizationsleepvisual cortex

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Developmental Neuroscience

Background:

  • Synaptic refinement is crucial for visual system development in juvenile rodents.
  • Adolescence is characterized by a significant reduction in sleep slow-wave activity (SWA) in rodents and humans.
  • SWA reflects neuronal population activity and is influenced by cortical neuron organization.

Purpose of the Study:

  • To investigate if synaptic refinement can explain the developmental decline in SWA.
  • To model the relationship between synaptic organization and SWA during development.

Main Methods:

  • Utilized a large-scale neural model of the primary visual cortex and thalamus.
  • Simulated synaptic refinement by altering intralaminar connections based on experimental data.
  • Incorporated spike-timing-dependent plasticity and homeostatic synaptic renormalization to model learning-induced refinement.

Main Results:

  • Synaptic refinement in the model led to a decrease in SWA and altered slow-wave morphology, matching experimental observations.
  • Activity-dependent synaptic refinement, driven by learning with oriented stimuli, also resulted in a decline in SWA.
  • The model successfully replicated the developmental drop in SWA attributed to synaptic reorganization.

Conclusions:

  • Synaptic refinement is a plausible mechanism underlying the developmental decrease in SWA.
  • Sleep SWA may serve as a non-invasive biomarker for tracking cortical connection reorganization during development.
  • This study highlights the interplay between neural development, synaptic plasticity, and sleep regulation.