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Related Concept Videos

Sympathetic Activation01:16

Sympathetic Activation

The sympathetic division can influence tissues and organs by releasing norepinephrine at peripheral synapses and distributing epinephrine and norepinephrine through the bloodstream. In times of crisis or stress, sympathetic activation occurs, which is regulated by sympathetic centers in the hypothalamus. As a result, sympathetic activation prepares the body for physical exertion, rapid ATP production, and heightened alertness, allowing individuals to respond effectively to challenging or...
Hypothalamic-Pituitary Axis01:37

Hypothalamic-Pituitary Axis

The response to stress—be it physical or psychological, acute or chronic—involves activation of the Hypothalamic-Pituitary-Adrenal (HPA) axis. The HPA axis is part of the neuroendocrine system because it involves both neuronal and hormonal communication. Its function is to regulate homeostatic systems—metabolic, cardiovascular, and immune—providing the necessary means to respond to a stressor.
Adrenergic Neurons: Neurotransmission01:27

Adrenergic Neurons: Neurotransmission

Postganglionic sympathetic fibers (except those supplying the sweat glands) releasing noradrenaline or norepinephrine are called noradrenergic or adrenergic neurons. Noradrenaline, dopamine, adrenaline, or epinephrine are collectively called "catecholamines" as they contain a catechol moiety and an amine side chain. The five stages of neurotransmitter release involve their synthesis, storage, release, reuptake and metabolism.
Synthesis: Catecholamine synthesis requires tyrosine, which is taken...
Sympathetic Pathways: Collateral Ganglia and Adrenal Medulla01:27

Sympathetic Pathways: Collateral Ganglia and Adrenal Medulla

The sympathetic pathways of the collateral ganglia and adrenal medulla serve unique but interconnected roles in the sympathetic response.
Collateral Ganglia
Sympathetic preganglionic axons reach the collateral ganglia along the route of splanchnic nerves. These nerves bypass the sympathetic trunk and communicate with sympathetic postganglionic neurons housed in the prevertebral ganglia. These ganglia supply the organs of the abdominopelvic cavity.
The greater splanchnic nerve, formed by the...
Sympathetic Signaling01:31

Sympathetic Signaling

Sympathetic signaling, a vital part of the autonomic nervous system, plays a crucial role in mobilizing the body's resources in response to stress or emergencies. It involves the transmission of nerve impulses from sympathetic preganglionic fibers to postganglionic fibers. This results in the release of specific neurotransmitters and activation of adrenergic receptors.
Sympathetic preganglionic fibers release the neurotransmitter acetylcholine (ACh) onto the ganglionic neurons in the...
Hormones of the Adrenal Glands01:31

Hormones of the Adrenal Glands

Adrenal hormones play a pivotal role in maintaining the body's electrolyte balance and orchestrating responses to stress, showcasing the intricate functions of the adrenal cortex and medulla.
The adrenal cortex, a powerhouse of hormone synthesis, generates over two dozen corticosteroid hormones. The zona glomerulosa produces mineralocorticoids, exemplified by aldosterone, influencing the electrolyte composition of body fluids. The synthesis of glucocorticoids such as cortisol and corticosterone...

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Related Experiment Video

Updated: Jun 20, 2026

Eye Tracking, Cortisol, and a Sleep vs. Wake Consolidation Delay: Combining Methods to Uncover an Interactive Effect of Sleep and Cortisol on Memory
08:08

Eye Tracking, Cortisol, and a Sleep vs. Wake Consolidation Delay: Combining Methods to Uncover an Interactive Effect of Sleep and Cortisol on Memory

Published on: June 18, 2014

Interacting noradrenergic and corticosteroid systems shift human brain activation patterns during encoding.

Anda H van Stegeren1, Benno Roozendaal, Merel Kindt

  • 1University of Amsterdam, Department of Clinical Psychology, Roetersstraat 15, 1018 WB Amsterdam, The Netherlands. A.H.vanStegeren@uva.nl

Neurobiology of Learning and Memory
|August 22, 2009
PubMed
Summary
This summary is machine-generated.

Stress hormones like cortisol and noradrenaline impact memory. While cortisol alone enhanced memory, combining both hormones altered brain activation patterns, particularly deactivating the prefrontal cortex during memory encoding.

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Area of Science:

  • Neuroscience
  • Psychology
  • Endocrinology

Background:

  • Emotionally charged events are typically well-remembered, a process linked to adrenal stress hormones.
  • Animal models indicate corticosterone and noradrenaline synergistically enhance memory via amygdala, hippocampus, and prefrontal cortex (PFC) pathways.

Purpose of the Study:

  • To investigate the interaction of stress hormone systems (corticosteroid and noradrenergic) on human memory formation.
  • To examine the effects of these hormone interactions on brain activation patterns during memory encoding.

Main Methods:

  • Forty-eight male subjects received hydrocortisone, yohimbine, or a combination before viewing emotional and neutral images.
  • Functional Magnetic Resonance Imaging (fMRI) monitored brain activity in the amygdala, hippocampus, and PFC during stimulus encoding.
  • Recognition memory was assessed one week later.

Main Results:

  • Hydrocortisone administration alone improved recognition memory.
  • Yohimbine did not show significant additional memory enhancement when combined with hydrocortisone.
  • Combined hormone administration led to reduced prefrontal cortex activation during encoding, contrasting with amygdala/hippocampus activation seen with individual hormones.

Conclusions:

  • While direct interaction effects on memory performance were not significant, stress hormone levels during encoding differentially modulated brain circuit activation.
  • The findings suggest a complex interplay between stress hormones and neural pathways involved in memory processing.