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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

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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

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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.
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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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Accessory Structures of the Skin: Hair and Hair Follicles01:16

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Hair and hair follicles are integral components of the integumentary system. Hair is a filamentous structure composed mainly of a protein called keratin. It is found on the surface of the skin throughout the body, except for areas such as the palms of the hands and soles of the feet.
Hair is a keratinous filament growing out of the epidermis. It is primarily made of dead, keratinized cells. Hair strands originate at the epidermal penetration called the hair follicle. The hair shaft is the part...
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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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Related Experiment Video

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Tactile Semiautomatic Passive-Finger Angle Stimulator TSPAS
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Tactile perception of randomly rough surfaces.

Riad Sahli1, Aubin Prot1,2, Anle Wang3

  • 1INM - Leibniz Institute for New Materials, 66123, Saarbrücken, Germany.

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Tactile perception of random surfaces relies on micro-scale roughness, not topography. Fingertip vibrations and friction cues guide similarity judgments, enabling detection of small friction differences.

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Area of Science:

  • Haptics and Materials Science
  • Surface Metrology
  • Sensory Perception

Background:

  • Everyday surfaces exhibit random roughness and self-similarity at small scales.
  • Understanding tactile perception of surface properties is crucial for material design and human-computer interaction.

Purpose of the Study:

  • To investigate how tactile perception of randomly rough surfaces is influenced by independent variations in topography and scale-dependent roughness.
  • To compare tactile and visual perception of surface similarity.
  • To explore the role of friction in tactile similarity judgments.

Main Methods:

  • Utilized 3D-printed samples with controlled topographic structure and statistical roughness properties.
  • Conducted tactile perception experiments where participants judged surface similarity.
  • Analyzed visual perception using color-coded surface height images.
  • Measured friction between fingertip and surfaces.
  • Constructed a psychometric curve relating similarity decisions to friction differences.

Main Results:

  • Tactile similarity perception was dominated by micro-scale roughness statistics, not topographic resemblance.
  • Participants could discern subtle differences in Hurst roughness exponent (0.2) and surface curvature (0.8 μm⁻¹).
  • Visual perception, in contrast, was driven by topographic resemblance.
  • Higher micro-scale roughness correlated with increased friction.
  • Participants detected friction coefficient differences as small as 0.035.

Conclusions:

  • Vibrational cues from micro-scale roughness at the finger ridge scale influence tactile similarity judgments, overriding topographic information.
  • Friction plays a significant role in tactile perception of surface similarity.
  • The study highlights distinct mechanisms for tactile and visual surface perception.