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Related Concept Videos

Nonconscious Mimicry01:13

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Updated: Nov 10, 2025

Applying Incongruent Visual-Tactile Stimuli during Object Transfer with Vibro-Tactile Feedback
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Snake Effect: A Novel Haptic Illusion.

Frederico M Severgnini, Juan S Martinez, Hong Z Tan

    IEEE Transactions on Haptics
    |March 31, 2021
    PubMed
    Summary
    This summary is machine-generated.

    We discovered a new haptic illusion, the "snake effect," which mimics a slithering sensation using vibrotactile pulses. Optimal signal timing creates this unique and engaging sensory experience.

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    Area of Science:

    • Haptics
    • Perception
    • Human-Computer Interaction

    Background:

    • Existing haptic illusions like apparent motion and sensory saltation lack a 'crawling' sensation.
    • There is a need for novel haptic feedback to enhance user experience in digital environments.

    Purpose of the Study:

    • To introduce and characterize a novel movement-based haptic illusion, the 'snake effect.'
    • To identify optimal signal parameters for evoking the snake effect.
    • To explore potential applications of the snake effect.

    Main Methods:

    • Modulating amplitude of successive vibrotactile pulses delivered via an array of tactors.
    • Pilot testing to determine effective signal parameters: pulse duration, carrier frequency, amplitude modulation waveform, and peak amplitude.
    • Main experiment using a one-up one-down adaptive procedure to find optimal signal onset asynchrony (SOA) ranges.

    Main Results:

    • The snake effect was successfully created, producing a wavy, creepy sensation.
    • Optimal signal parameters included a minimal pulse duration of 1.69 s, 200-300 Hz carrier frequency, sine/sine-squared/Gaussian modulation, and 30 dB peak amplitude.
    • The optimal signal onset asynchrony (SOA) range was determined to be 271.5 ms to 798 ms, with a midpoint of 535 ms.

    Conclusions:

    • The snake effect is a distinct and vivid haptic illusion.
    • It can be effectively generated using specific vibrotactile signal parameters.
    • The snake effect holds potential for information encoding, gaming, and entertainment applications.