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Related Concept Videos

Design Example: Resistive Touchscreen01:14

Design Example: Resistive Touchscreen

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A device engineer plays a crucial role in designing user interfaces for mobile devices. One such interface is the resistive touchscreen, which fundamentally consists of two metallic layers: a flexible upper layer and a rigid lower layer, separated by a narrow gap. The high resistance between these two layers is a key characteristic of this design.
When a user touches the screen, the two layers make contact at a specific point known as the touchpoint. This contact reduces the resistance between...
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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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Sensation01:21

Sensation

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Sensory receptors are specialized neurons that respond to specific types of external stimuli, initiating the process known as sensation. This occurs when sensory input, such as light entering the eye, is detected by these receptors, causing chemical changes in the cells of the retina. These cells then convert the sensory stimulus into action potentials that are transmitted to the central nervous system, a process termed transduction.
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Related Experiment Video

Updated: Jun 8, 2025

Measurement of Vibration Detection Threshold and Tactile Spatial Acuity in Human Subjects
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Viewed touch influences tactile detection by altering decision criterion.

Anupama Nair1, Jared Medina2,3

  • 1Department of Psychological and Brain Sciences, University of Delaware, 105 The Green, Room 108, Newark, DE, 19716, USA. asnair@udel.edu.

Attention, Perception & Psychophysics
|November 5, 2024
PubMed
Summary

Viewing touch alters tactile perception by changing decision-making, not sensory processing. This research suggests visual cues make people more likely to report feeling a touch, influencing tactile detection rates.

Keywords:
Decision criterionSignal detection theoryTactile perceptionTactile sensitivityVicarious tactile activation

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Last Updated: Jun 8, 2025

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Area of Science:

  • Neuroscience
  • Psychology
  • Sensory Perception

Background:

  • Tactile perception integrates somatosensory and visual information.
  • Previous studies show enhanced tactile detection when viewing touch, suggesting a vicarious tactile system.

Purpose of the Study:

  • To investigate whether viewing touch enhances tactile perception or alters decision criteria.
  • To differentiate between enhanced tactile sensitivity and a liberalized decision bias.

Main Methods:

  • Employed signal detection theory to analyze tactile sensitivity and decision criterion.
  • Conducted three experiments using a tactile detection task with visual stimuli (viewed touch, finger approach, control).

Main Results:

  • Viewing touch consistently shifted participants' decision criterion to be more liberal.
  • Tactile sensitivity showed inconsistent enhancement across experiments.
  • Observing a finger approaching a hand was sufficient to bias the decision criterion.

Conclusions:

  • Viewing touch influences tactile performance by modifying decision mechanisms, not by enhancing the tactile perceptual signal.
  • The vicarious tactile system hypothesis is less supported than the decision bias explanation.