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Homeostatic Regulation of Excitatory-Inhibitory Balance

  • Gina Turrigiano

Abstract

Activity plays an important role in refining synaptic connectivity during development, but the precise mechanisms that underlie this activity-dependent refinement are still unknown. There is considerable evidence that correlation-based, or Hebbian, plasticity mechanisms akin to long-term potentiation and depression (LTP and LTD) play an important role in synaptic refinement1–3. However, it is not clear that Hebbian plasticity is sufficient for understanding activity-dependent development because the dramatic changes in synaptic strength produced by this kind of plasticity tend to destabilize the activity of neural circuits4–6. Additionally, LTD and LTP do not automatically generate competition between inputs5, but such competition is clearly an important aspect of sensory system plasticity1. It is therefore likely that LTP and LTD-like phenomena co-exist with other cellular plasticity mechanisms that provide competition and stability during activity-dependent development.

Keywords

Visual Cortex Firing Rate Primary Visual Cortex Synaptic Strength Homeostatic Regulation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 2003

Authors and Affiliations

  • Gina Turrigiano
    • 1
  1. 1.Department of Biology and Volen National Center for Complex SystemsBrandeis UniversityWalthamUSA

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