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Tactile and Chemical Senses01:27

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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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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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Related Experiment Video

Updated: Apr 15, 2026

Applying Incongruent Visual-Tactile Stimuli during Object Transfer with Vibro-Tactile Feedback
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Identification of Vibrotactile Patterns Encoding Obstacle Distance Information.

Yeongmi Kim, Matthias Harders, Roger Gassert

    IEEE Transactions on Haptics
    |March 26, 2015
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    Haptic feedback from electronic travel aids helps visually impaired individuals navigate by conveying obstacle distance. Spatio-temporal and spatial/temporal/intensity variations in four-finger vibrations proved most effective and preferred.

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    Area of Science:

    • Human-Computer Interaction
    • Assistive Technology
    • Sensory Substitution

    Background:

    • Visually impaired individuals can benefit from enhanced sensory feedback for independent ambulation.
    • Haptic technology, particularly vibrotactile signals, is a promising modality for conveying environmental information.

    Purpose of the Study:

    • To investigate the impact of different tactile rendering methods and feedback configurations on obstacle distance identification for the visually impaired.
    • To evaluate user preference and workload associated with various haptic feedback designs.

    Main Methods:

    • Three tactile rendering methods (temporal, spatio-temporal, spatial/temporal/intensity variation) were tested.
    • Two vibration feedback configurations (single-finger and four-finger) were employed.
    • Participants' identification accuracy, preference, and perceived workload were assessed.

    Main Results:

    • A significant interaction was found between tactile rendering method and feedback configuration.
    • Spatio-temporal variation generally yielded high correct identification rates.
    • Four-finger vibration with spatial/temporal/intensity variation also showed high distance identification and was preferred by users.

    Conclusions:

    • Haptic displays utilizing spatio-temporal or spatial/temporal/intensity variation with four-finger feedback are effective for conveying obstacle distance.
    • These methods offer low workload and are preferred by users, providing valuable design guidance for electronic travel aids.