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Stress and plasticity in the limbic system.

Robert M Sapolsky1

  • 1Department of Biological Sciences, Stanford University, Gilbert Laboratory, MC 5020, Stanford, California 94305-5020, USA. sapolsky@stanford.edu

Neurochemical Research
|October 31, 2003
PubMed
Summary

Stress significantly impacts nervous system plasticity, affecting learning and memory. Severe stress impairs explicit learning, while mild stress can enhance it, and various stressors boost implicit fear conditioning.

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Area of Science:

  • Neuroscience
  • Neuroplasticity
  • Stress Physiology

Background:

  • The adult nervous system exhibits plasticity, allowing it to change and be reshaped by experience.
  • Understanding the mechanisms of neuroplasticity is a significant scientific challenge.
  • Stress is known to alter nervous system plasticity, particularly within the limbic system.

Purpose of the Study:

  • To review how stress influences neuroplasticity.
  • To examine the differential effects of stress severity and duration on learning and memory.
  • To explore stress-induced changes in fear conditioning and associated neural plasticity.

Main Methods:

  • Literature review of studies investigating stress and neuroplasticity.
  • Analysis of research on hippocampal-dependent explicit learning under stress.
  • Examination of studies on implicit fear conditioning and amygdala plasticity.

Main Results:

  • Severe and/or prolonged stress impairs hippocampal-dependent explicit learning and its underlying plasticity.
  • Mild and transient stress can facilitate hippocampal-dependent explicit learning and plasticity.
  • Various stressors enhance implicit fear conditioning and the amygdaloid plasticity that supports it.

Conclusions:

  • Stress has complex and dose-dependent effects on neuroplasticity.
  • The impact of stress on learning and memory depends on the nature of the stressor.
  • Understanding these stress-induced plasticity changes is crucial for addressing cognitive and emotional disorders.

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