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    Area of Science:

    • Human-Computer Interaction
    • Haptics and Tactile Feedback
    • Perception Science

    Background:

    • Material perception during tapping can be altered using vibration feedback.
    • Haptic material augmentation on touchscreens requires low-latency systems capable of measuring approach velocity.
    • A novel touchscreen system with 0.1 ms latency was developed for this purpose.

    Purpose of the Study:

    • To measure the human detection threshold for vibration feedback latency.
    • To investigate the impact of latency on perceived material properties during tapping interactions.

    Main Methods:

    • A psychophysical approach was used to determine the latency detection threshold.
    • A custom touchscreen system measuring approach velocity and providing low-latency vibration feedback was employed.
    • Subjective questionnaires assessed the influence of latency on material perception.

    Main Results:

    • The human detection threshold for vibration feedback latency was found to be approximately 5.5 ms.
    • Introduced latency led to the perception of a softer surface.
    • Users reported sensations of bouncing and denting due to the feedback latency.

    Conclusions:

    • Vibration feedback latency significantly impacts tactile material perception.
    • Achieving very low latency (below 5.5 ms) is essential for effective haptic material augmentation.
    • Latency can introduce illusory tactile sensations, altering the perceived properties of virtual surfaces.