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Related Concept Videos

Tactile and Chemical Senses01:27

Tactile and Chemical Senses

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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.
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Somatosensation01:33

Somatosensation

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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.
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Sensory Functions of the Skin01:16

Sensory Functions of the Skin

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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...
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Sensory Perception: Organization of the Somatosensory System01:11

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The somatosensory system is the central and peripheral nervous system component that senses and processes touch, pressure, pain, temperature, and body position or proprioception. The process of sensation takes place at three levels:
The receptor level:
The receptor level is the first stage of sensation. It involves the detection of a stimulus by specialized sensory receptors. The stimulus must arrive within the receptor's receptive field. Next, the receptor converts the energy of the...
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The Tongue and Taste Buds00:49

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The surface of the tongue is covered with various small bumps called papillae, which either distribute what has been ingested (filiform papillae) or contain the sensory taste (or gustatory) receptor cells (fungiform, circumvallate, and foliate papillae). Embedded within each taste-related papilla are the taste buds—clusters of 30 to 100 gustatory receptor cells.
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Characteristics of Dry Friction01:21

Characteristics of Dry Friction

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Dry friction occurs when two solid surfaces slide against each other without any lubrication or fluid present. It causes resistance when pushing objects along a surface, like a gardener pushing a wheelbarrow. The force applied to move the cart causes dry friction between the wheel and the ground.
Before the wheelbarrow starts moving, the static frictional force acts tangentially to the contact surface, opposing the force that is about to induce the motion. This frictional force prevents the...
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Related Experiment Video

Updated: Jul 30, 2025

Tactile Semiautomatic Passive-Finger Angle Stimulator TSPAS
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Tactile Perception of Coated Smooth Surfaces.

Easa AliAbbasi, Volkan Aydingul, Alperen Sezgin

    IEEE Transactions on Haptics
    |May 17, 2023
    PubMed
    Summary
    This summary is machine-generated.

    Human touch can detect differences in surface chemistry on nanometer-scale coated surfaces. This study links physical measurements to tactile perception, revealing the impact of coating materials on how we feel surfaces.

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    Area of Science:

    • Materials Science
    • Human Perception
    • Tribology

    Background:

    • Surface coatings enhance product aesthetics and function across industries.
    • Tactile perception of nanometer-scale coated surfaces remains under-explored.
    • Limited research links physical surface properties to tactile perception of coatings.

    Purpose of the Study:

    • To investigate the influence of coating materials on tactile perception of smooth surfaces.
    • To correlate physical surface measurements with human tactile discrimination abilities.
    • To understand the adhesive contact mechanisms underlying tactile perception of coated surfaces.

    Main Methods:

    • Two-alternative forced choice (2AFC) experiments with 8 participants to assess tactile discrimination.
    • Measurement of the coefficient of friction using a custom tribometer.
    • Determination of surface energies via Sessile drop tests with 4 liquids.

    Main Results:

    • Participants could discriminate between different coated surfaces, indicating tactile sensitivity to coating variations.
    • Physical measurements (friction, surface energy) showed significant differences based on coating material.
    • A strong correlation was observed between coating material, physical properties, and tactile perception.

    Conclusions:

    • Coating material significantly impacts tactile perception of smooth surfaces.
    • The human finger can detect subtle differences in surface chemistry, likely through molecular interactions.
    • This research provides a foundation for understanding tactile perception related to surface engineering.