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Related Experiment Video

Updated: May 7, 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

Sleep and cortisol interact to support memory consolidation.

Kelly A Bennion1, Katherine R Mickley Steinmetz2, Elizabeth A Kensinger1

  • 1Department of Psychology, Boston College, Chestnut Hill, MA 02467, USA.

Cerebral Cortex (New York, N.Y. : 1991)
|September 28, 2013
PubMed
Summary

Elevated cortisol levels before learning enhance memory consolidation, especially for negative memories, but only when followed by sleep. This suggests cortisol tags important information for sleep to process effectively.

Keywords:
attentionemotionfMRIglucocorticoidsstress

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Area of Science:

  • Neuroscience
  • Psychology
  • Cognitive Science

Background:

  • Cortisol, a stress hormone, has been linked to memory benefits.
  • Sleep plays a crucial role in memory consolidation.
  • Previous research indicates separate benefits of cortisol and sleep on memory.

Purpose of the Study:

  • To investigate the interaction between pre-learning cortisol levels and sleep on memory consolidation.
  • To explore the specific impact on memory for emotionally charged stimuli.
  • To elucidate the underlying mechanisms using behavioral and neuroimaging techniques.

Main Methods:

  • Measured resting cortisol levels before learning tasks.
  • Assessed subsequent memory performance after periods of sleep or wakefulness.
  • Utilized eye-tracking to analyze attention during encoding.
  • Employed neuroimaging (fMRI) to examine brain activity during retrieval.

Main Results:

  • Cortisol levels positively correlated with memory recall, but only after sleep, not wakefulness.
  • This effect was particularly pronounced for negative, arousing stimuli.
  • Eye-tracking data showed cortisol strengthened the link between attention and memory for negative items.
  • Neuroimaging revealed enhanced activity in the amygdala and vmPFC during retrieval of consolidated negative memories.

Conclusions:

  • Pre-learning cortisol interacts with sleep to selectively enhance memory consolidation for salient (negative) information.
  • Cortisol may 'tag' attended information as important, facilitating sleep-dependent consolidation.
  • This process refines neural pathways for retrieving emotionally significant memories.