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Does melatonin have an effect on cognitive performance?

H A Slotten1, S Krekling

  • 1Department of Psychology, Norwegian University of Science and Technology, Trondheim, Norway. helge.slotten@sv.ntnu.no

Psychoneuroendocrinology
|November 1, 1996
PubMed
Summary

Melatonin does not directly impair cognitive function. However, cognitive processing speed slows during the body temperature trough following melatonin intake, likely due to its hypothermic effects.

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Area of Science:

  • Neuroscience
  • Chronobiology
  • Cognitive Psychology

Background:

  • Melatonin is known to influence circadian rhythms, body temperature, and induce sleepiness.
  • The direct impact of melatonin on cognitive performance remains a subject of debate.
  • Understanding melatonin's cognitive effects is crucial for its therapeutic applications.

Purpose of the Study:

  • To investigate the effects of exogenous melatonin on cognitive performance during daytime.
  • To differentiate between the direct effects of melatonin and its indirect effects via body temperature changes.
  • To assess cognitive function at specific time points relative to melatonin peak and body temperature trough.

Main Methods:

  • A double-blind, placebo-controlled, alternating treatments design was employed with N=1 participant.

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  • Cognitive performance was assessed using logical reasoning, serial add/subtract, visual-spatial, and reaction time tasks.
  • Serum melatonin levels and core body temperature were monitored alongside cognitive testing.

    • Main Results:

    • Cognitive performance (speed and accuracy) was unaffected during the peak serum melatonin levels.
    • Reaction times on all cognitive tasks significantly increased during the body temperature trough.
    • These findings suggest melatonin's effects on cognition are mediated by its hypothermic properties.

    Conclusions:

    • Circulating melatonin does not exert a direct, immediate effect on cortical information processing.
    • The observed decrease in cognitive processing speed is linked to melatonin-induced hypothermia.
    • Melatonin's impact on cognitive speed appears to be a consequence of reduced cerebral processing speed due to lower body temperature.