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Related Concept Videos

Insufficient Sleep and Sleep Deprivation01:13

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Insufficient sleep refers to not getting the recommended amount of sleep for optimal functioning, even if it's just slightly less than needed. Sleep insufficiency may occur due to lifestyle choices, such as staying up late for social events or work, resulting in routinely getting less sleep than required. For example, consistently sleeping 6 hours when the body needs 7-9 hours can lead to cumulative effects on health and well-being.
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Substance use disorders involve a pattern of using drugs more extensively than intended and continuing use despite harmful consequences. This includes legal substances like alcohol and nicotine, as well as illegal drugs. These disorders often involve both physical and psychological dependence, reflecting compulsive use of substances that significantly alter thoughts, feelings, and behaviors, contributing to a major public health issue.
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Related Experiment Video

Updated: Dec 9, 2025

Eye Tracking, Cortisol, and a Sleep vs. Wake Consolidation Delay: Combining Methods to Uncover an Interactive Effect of Sleep and Cortisol on Memory
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Sleep deprivation and compensatory cognitive effort on a visual information processing task.

Molly J Sullan1, Sean P A Drummond2, Eric Granholm1,3

  • 1VA San Diego Healthcare System (VASDHS), San Diego, CA.

Sleep
|September 11, 2020
PubMed
Summary
This summary is machine-generated.

Total sleep deprivation (TSD) impairs cognitive performance, but pupillometry reveals increased effort on easy tasks and disengagement from hard ones. This suggests sleep deprivation alters cognitive resource allocation based on task difficulty.

Keywords:
cognitive effortcompensationprocessing loadresource allocationsleep deprivation

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Area of Science:

  • Cognitive Neuroscience
  • Sleep Science
  • Psychology

Background:

  • Total sleep deprivation (TSD) effects on cognition are debated, with some studies showing deficits and others no change.
  • Compensatory cognitive effort may explain preserved performance despite TSD.
  • Understanding the interplay between TSD, cognitive engagement, and performance is crucial.

Purpose of the Study:

  • To investigate the relationship between TSD, cognitive engagement, and performance outcomes.
  • To explore how cognitive effort allocation changes after sleep deprivation.

Main Methods:

  • Twenty healthy adults underwent cognitive testing after normal sleep and ~55 hours of TSD.
  • Participants performed a visual letter detection task (span of apprehension) with varying load (3-item vs. 10-item arrays).
  • Pupillometry was used concurrently to measure cognitive effort.

Main Results:

  • Poorer detection accuracy and slower response times were observed after TSD.
  • Increased pupillary responses (indicating greater cognitive effort) were found before array onset in both conditions.
  • A significant interaction showed greater pupillary dilation for easier (3-item) arrays after TSD, but not for harder (10-item) arrays.

Conclusions:

  • TSD leads to complex changes in attentional control and cognitive resource allocation.
  • Sleep-deprived individuals may exert more effort on simpler tasks but disengage from more demanding ones.
  • Further research is needed to understand the neural mechanisms of these load-dependent attentional control changes after TSD.