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Related Concept Videos

Design Example01:23

Design Example

The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
Sensory Modalities01:15

Sensory Modalities

Sensation typically is the process by which the sensory receptors and sense organs detect stimuli from the internal and external environment and transmit this information to the central nervous system for processing.
General senses refer to the broad category of sensory information detected by receptors in the body and can be further grouped into somatic and visceral senses. Somatic sensations include touch, pressure, temperature, and pain and are essential for navigating our environment and...
Design Example: Resistive Touchscreen01:14

Design Example: Resistive Touchscreen

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...
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...
Potentiometer01:30

Potentiometer

Voltage and current measurements using a standard voltmeter and ammeter alter the circuit being measured either by drawing or resisting the current flow, which introduces uncertainties in the measurements. Null measurements balance the voltages so that no current flows through the measuring device and, therefore, no alterations occur in the measured circuit.
Suppose the emf of a battery needs to be measured. If the battery is directly connected to a standard voltmeter, the measured quantity is...
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.

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Measurement of Vibration Detection Threshold and Tactile Spatial Acuity in Human Subjects
07:32

Measurement of Vibration Detection Threshold and Tactile Spatial Acuity in Human Subjects

Published on: September 1, 2016

Direction coding using a tactile chair.

Sjoerd C de Vries1, Jan B F van Erp, Raymond J Kiefer

  • 1TNO Defence, Security and Safety, Business Unit Human Factors, Kampweg 5, P.O. Box 23, 3769 ZG Soesterberg, Netherlands. sjoerd.devries@tno.nl

Applied Ergonomics
|November 11, 2008
PubMed
Summary
This summary is machine-generated.

Drivers can receive directional cues from a car seat with a tactile display. This innovative system shows promise for enhancing driver awareness and safety across diverse users.

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Area of Science:

  • Human-Computer Interaction
  • Automotive Safety
  • Haptic Technology

Background:

  • Effective driver communication is crucial for road safety.
  • Traditional auditory and visual cues can increase cognitive load.
  • Exploring alternative sensory channels like haptics offers potential benefits.

Purpose of the Study:

  • To evaluate a car seat with an embedded tactile display for directional information delivery.
  • To assess the accuracy and response times of directional perception via seat vibrations.
  • To investigate factors influencing tactile directional cueing effectiveness.

Main Methods:

  • An 8x8 vibrator matrix in a car seat was used to code eight directions.
  • Localization response time and angular accuracy were measured.
  • Stimulus direction, attention cues, temporal patterns, and user demographics were analyzed.

Main Results:

  • Mean absolute angular error was 23 degrees; back directions were perceived most accurately.
  • Faster vibration patterns (125-250 ms) without attention cues outperformed slower patterns.
  • Tactile stimuli were detected by over 90% of participants, with minimal age/gender effects.

Conclusions:

  • A tactile car seat is a viable and robust method for communicating directional information.
  • This haptic feedback system shows potential for improving driver navigation and safety.
  • The technology is effective across a broad user base, indicating wide applicability.