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Related Concept Videos

Homeostatic Imbalances in Body Temperature01:19

Homeostatic Imbalances in Body Temperature

Hyperthermia occurs when the body's temperature becomes unusually high, often due to heat exposure, intense physical activity, or certain illnesses. This condition can create a dangerous cycle where elevated body temperature increases the metabolic rate, generating more heat and potentially leading to organ failure and brain damage. A severe form of hyperthermia, called heat stroke, can raise body temperature to life-threatening levels. Fever, on the other hand, is a controlled form of...
Increased Body Temperature01:25

Increased Body Temperature

A body temperature above  38°C  (100.4 °F) is known as fever or pyrexia, and a person with fever is termed 'febrile.' Typically, the hypothalamus, a part of the brain that acts as the body's thermostat, regulates body temperature through a thermoregulatory setpoint. It receives signals from cold and warm thermal receptors throughout the body and adjusts the body's temperature accordingly. Fever occurs when this hypothalamic setpoint is altered, usually in response to an infection or illness.
Attention-Deficit/Hyperactivity Disorder01:30

Attention-Deficit/Hyperactivity Disorder

Attention-deficit/hyperactivity disorder (ADHD) is a neurodevelopmental disorder characterized by persistent inattention, hyperactivity, and impulsivity. It affects approximately 5-8% of children globally, with around 60-70% of cases persisting into adulthood. ADHD has significant implications for educational attainment, social interactions, and occupational success.
Diagnostic Criteria and Symptoms
To diagnose ADHD, symptoms must manifest before age 12 and be evident across multiple settings.
Thermoregulation01:26

Thermoregulation

The human body has a sophisticated thermoregulation system that employs negative feedback mechanisms to maintain an optimal core temperature. When the core temperature drops, peripheral and central thermoreceptors send signals to the hypothalamus, activating the heat-promoting center. This center triggers several responses aimed at increasing the core temperature. First, vasoconstriction reduces the flow of warm blood from internal organs to the skin so that the heat is not lost from the skin,...
Decreased Body Temperature01:29

Decreased Body Temperature

A decreased body temperature can occur in patients with hypothermia and frostbite. Heat loss with extended cold exposure overpowers the body's ability to create heat, resulting in hypothermia. Core temperature readings help classify hypothermia. Mild hypothermia is temperatures between 32 °C (89.6 °F) and 35°C (95 °F) and is caused by impaired thermoregulation. Moderate hypothermia is temperatures between 28 C (82.4 °F) and 32 °C (89.6 °F) caused by sustained extreme cold exposure, and severe...
Body Temperature01:25

Body Temperature

The body's temperature, measured in degrees, is determined by the balance between heat production and dissipation to the surrounding environment. For instance, if exercising vigorously, the body will produce more heat, causing sweat and dissipating that heat. Despite extreme environmental conditions and physical exertion, the human temperature-control system maintains a constant core body temperature (the temperature of deep tissues, which are the tissues located beneath the skin and other...

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Related Experiment Video

Updated: May 19, 2026

Using Brain Activation (nir-HEG/Q-EEG) and Execution Measures (CPTs) in a ADHD Assessment Protocol
13:09

Using Brain Activation (nir-HEG/Q-EEG) and Execution Measures (CPTs) in a ADHD Assessment Protocol

Published on: April 1, 2018

Hyperthermia impairs the executive function using the Attention Network Test.

Gang Sun1, Xiao Yang, Qingjun Jiang

  • 1Department of Medical Imaging, Jinan Military General Hospital, Jinan, Shandong Province, China. cjr.sungang@vip.163.com

International Journal of Hyperthermia : the Official Journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group
|September 6, 2012
PubMed
Summary

Passive hyperthermia impairs executive control, a key part of the attention system. Alerting and orienting functions remained unaffected by heat stress, indicating specific cognitive impacts.

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Area of Science:

  • Cognitive Neuroscience
  • Human Physiology
  • Environmental Health

Background:

  • The human attention system is crucial for cognitive processing.
  • The Attention Network Test (ANT) is a validated tool for assessing attention networks.
  • Understanding the impact of environmental stressors like heat on cognition is important.

Purpose of the Study:

  • To investigate the effects of passive hyperthermia on the human attention system.
  • To determine how heat stress influences alerting, orienting, and executive control networks.
  • To utilize the ANT in a controlled heat stress and control condition.

Main Methods:

  • Sixteen right-handed subjects were exposed to a heat stress condition (50°C, 40% RH) and a control condition (20°C, 40% RH) for one hour each.
  • The Attention Network Test (ANT) was administered to assess reaction time and accuracy.
  • Body core temperature (T-core) and body weight loss were monitored.

Main Results:

  • Body core temperatures significantly increased in the heat stress condition.
  • No significant differences in overall reaction time or accuracy were observed between conditions.
  • Executive control network performance was significantly impaired in the heat stress condition compared to the control.

Conclusions:

  • Passive hyperthermia negatively impacts executive control function.
  • Alerting and orienting networks of attention are not significantly affected by passive hyperthermia.
  • Heat stress specifically impairs the ability to resolve cognitive conflict.