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Thermal effects on cognition: a new quantitative synthesis.

José Ignacio López-Sánchez1, P A Hancock2

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Rising global temperatures increase thermal stress, impairing cognitive function and work performance, especially for outdoor workers. This study presents mathematical models and software to assess and mitigate heat-related cognitive decline.

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Area of Science:

  • Environmental Health
  • Cognitive Science
  • Occupational Health

Background:

  • Increasing global temperatures impose thermal load, stressing organisms and impacting human activities.
  • Thermal stress negatively affects both physical work capacity and cognitive functions.
  • Cognition is crucial for problem-solving, yet heat exposure degrades thinking abilities.

Purpose of the Study:

  • To refine the isothermal description of cognitive decrements under thermal stress.
  • To provide mathematical functions linking performance deterioration to time/temperature conditions.
  • To develop a tool for monitoring, assessing, and mitigating adverse thermal loads.

Main Methods:

  • Synthesis of existing empirical evidence on thermal stress and cognition.
  • Development of mathematical functions to quantify cognitive performance decline.
  • Creation of a free software tool for thermal load assessment.

Main Results:

  • Mathematical functions accurately describe task-specific cognitive performance deterioration.
  • The degree of cognitive decrement is directly linked to specific time/temperature exposures.
  • A user-friendly software tool is available for practical application.

Conclusions:

  • Thermal stress significantly impairs human cognitive functioning.
  • Quantifiable relationships exist between heat exposure and cognitive deficits.
  • The developed tool can aid in preserving cognitive health in thermally challenging environments.