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Related Concept Videos

Thermosensation01:43

Thermosensation

Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...
Tactile and Chemical Senses01:27

Tactile and Chemical Senses

Tactile senses encompass touch, temperature, and pain, each mediated by specific receptors. Touch receptors detect mechanical energy or pressure against the skin. Sensory fibers from these receptors enter the spinal cord and relay information to the brain stem. Here, most fibers cross over to the opposite side of the brain. The touch information then moves to the thalamus, which projects a map of the body's surface onto the somatosensory areas of the parietal lobes in the cerebral cortex. This...
Sensory Functions of the Skin01:16

Sensory Functions of the Skin

The skin is the largest organ of the human body and plays a crucial role in our sensory perception. It contains a vast network of sensory receptors that contribute to the skin's protective function by perceiving physical, biological, and environmental cues and generating relevant responses.
There are two main categories of receptors on the skin: capsulated and non-capsulated. The non-capsulated ones are mainly the pain receptors. The capsulated ones can be further categorized based on the...
Somatosensation01:33

Somatosensation

The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.
Joule-Thomson Effect01:21

Joule-Thomson Effect

The Joule-Thomson effect, also known as the Joule-Kelvin effect, describes the temperature change of a fluid when it is forced through a valve or porous plug while keeping it in a thermally insulated environment. This experiment is called a throttling process. This is an important effect widely used in refrigeration and the liquefaction of gases.
This experiment forces high-pressure gas through a throttle valve or a porous plug to a lower-pressure region. The gas expands as it passes through to...
Assessing Body Temperature - Tympanic membrane01:14

Assessing Body Temperature - Tympanic membrane

Assessing tympanic membrane temperature involves using a tympanic membrane thermometer (TMT). Here is a step-by-step guide:
Step 1: Begin by practicing good hand hygiene to prevent the transmission of microorganisms.
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Step 4: Instruct the patient to tilt their head to the side for comfort and check for cerumen...

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Related Experiment Video

Updated: Jun 24, 2026

Characterization of Thermal Transport in One-dimensional Solid Materials
05:20

Characterization of Thermal Transport in One-dimensional Solid Materials

Published on: January 26, 2014

Tactile perception of thermal diffusivity.

Wouter M Bergmann Tiest1, Astrid M L Kappers

  • 1Helmholtz Institute, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands. w.m.bergmanntiest@uu.nl

Attention, Perception & Psychophysics
|March 24, 2009
PubMed
Summary
This summary is machine-generated.

Human touch can distinguish materials by their thermal diffusivity, the rate of heat extraction. Our study found that people can discriminate materials based on cooling speed, with cooling rate being the most significant sensory cue.

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Last Updated: Jun 24, 2026

Characterization of Thermal Transport in One-dimensional Solid Materials
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07:28

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13:21

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Area of Science:

  • Psychophysics
  • Sensory Perception
  • Material Science

Background:

  • Thermal diffusivity dictates heat transfer rate between skin and objects.
  • This property is crucial for tactile material discrimination.
  • Quantifying human ability to perceive thermal diffusivity is key.

Purpose of the Study:

  • To quantitatively assess human observers' ability to discriminate materials by heat extraction rate.
  • To identify the primary sensory cues used in tactile thermal discrimination.
  • To establish discrimination thresholds for thermal diffusivity.

Main Methods:

  • Controlled experiments involving repeated selection of faster-cooling stimuli.
  • Systematic variation of heat extraction rates and temperature differences.
  • Separate investigations into the roles of initial cooling rate and end temperature as discriminative cues.

Main Results:

  • The discrimination threshold for thermal diffusivity was approximately 43% of the extraction rate.
  • A doubling of the cooling rate resulted in a doubling of the absolute threshold.
  • Reducing the temperature difference had a less pronounced effect on the discrimination threshold compared to changes in cooling rate.

Conclusions:

  • Human observers can effectively discriminate materials based on thermal diffusivity through tactile perception.
  • Initial cooling rate is a more dominant cue than end temperature for this discrimination.
  • The findings provide a quantitative basis for understanding tactile thermal perception.