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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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Design Example: Resistive Touchscreen01:14

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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.
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The human ear is not equally sensitive to all frequencies in the audible range. It may perceive sound waves with the same pressure but different frequencies as having different loudness. Moreover, the perception of sound waves depends on the health of an individual's ears, which decays with age. The health of one's ears may also be affected by regular exposure to loud noises.
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Related Experiment Video

Updated: Mar 24, 2026

Applying Incongruent Visual-Tactile Stimuli during Object Transfer with Vibro-Tactile Feedback
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Virtual Active Touch: Perception of Virtual Gratings Wavelength through Pointing-Stick Interface.

S Okamoto, T Yamauchi, M Konyo

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    This study introduces a virtual-active-touch method for haptic perception without physical hand movement. This technique allows users to feel surface textures through a virtual cursor, enhancing human-computer interaction.

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    Area of Science:

    • Human-Computer Interaction
    • Haptics
    • Virtual Reality

    Background:

    • Tactile feedback is crucial for intuitive human-computer interfaces, with active touch guiding many current methods.
    • Existing techniques often require direct physical hand movements to simulate tactile sensations.

    Purpose of the Study:

    • To introduce and validate a novel virtual-active-touch method for haptic perception.
    • To investigate if tactile feedback can be achieved without actual hand movements.
    • To compare the effectiveness of virtual-active-touch with traditional active touch methods.

    Main Methods:

    • A virtual-active-touch interface was developed where a cursor acts as a virtual finger.
    • Users interacted with virtual roughness gratings using the cursor controlled by a force-input device.
    • Performance was compared against an interface requiring actual hand movements.

    Main Results:

    • The virtual-active-touch method successfully conveyed surface wavelengths, a key texture property.
    • Force-to-velocity gain significantly impacted the perceived texture roughness.
    • Perceived wavelengths were skewed when objects were scaled and viewed on smaller screens.

    Conclusions:

    • Virtual-active-touch interfaces can enable perception of surface wavelengths through intended cursor movement.
    • Further research is needed to address challenges like perceptual skewing on smaller displays.
    • This method offers a promising avenue for natural tactile feedback in human-computer interaction.