Related Experiment Video
Updated: Nov 3, 2025
08:05
Testing Tactile Masking between the Forearms
Published on: February 10, 2016
6.6K
Sensitivity to Haptic Sound-Localization Cues at Different Body Locations
Mark D Fletcher1,2, Jana Zgheib2, Samuel W Perry1,2
1Institute of Sound and Vibration Research, Faculty of Engineering and Physical Sciences, University of Southampton, University Road, Southampton SO17 1BJ, UK.
Sensors (Basel, Switzerland)
|June 2, 2021
Summary
Tactile intensity differences (TIDs) delivered to the wrist can significantly improve sound localization for cochlear implant (CI) users. This study found sensitivity to TIDs comparable to natural hearing, suggesting enhanced spatial hearing capabilities.
Area of Science:
- Auditory Neuroscience
- Human-Computer Interaction
- Biomedical Engineering
Background:
- Cochlear implants (CIs) restore hearing but often result in limited spatial hearing.
- Electro-haptic stimulation, using tactile feedback, shows promise for improving sound localization in CI users.
- Tactile intensity differences (TIDs) across limbs mimic auditory intensity differences, a key sound localization cue.
Purpose of the Study:
- To establish sensitivity to across-limb TIDs at potential wearable haptic device locations.
- To compare TID sensitivity with natural sound localization cues.
- To assess the dynamic range of haptic stimulation for potential use in hearing aids.
Main Methods:
- Participants were tested for sensitivity to TIDs at the lower tricep, palmar wrist, and dorsal wrist.
- TID sensitivity was compared to across-ear intensity difference sensitivity in normal-hearing listeners.
- The dynamic range of haptic stimulation was measured at each candidate location.
Main Results:
- TID sensitivity was similar across all tested locations (lower tricep, palmar, and dorsal wrist) compared to normal-hearing listeners.
- The measured dynamic range of haptic stimulation significantly exceeded that of electrical CI stimulation.
- Sensitivity and dynamic range suggest potential for improved haptic sound localization.
Conclusions:
- Wearable haptic devices can be effectively deployed at multiple locations (tricep, wrist) for hearing assistance.
- Haptic stimulation offers a low-cost, non-invasive method to enhance spatial hearing for hearing-impaired individuals.
- This technology could significantly improve outcomes for cochlear implant users by providing additional sound-intensity information.
Related Concept Videos
01:33Somatosensation
41.3K
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.
41.3K
01:21Perceiving Loudness, Pitch, and Location
578
The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by...
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by...
578
01:16Sensory Functions of the Skin
6.7K
The skin is the largest organ of the human body and plays a crucial role in our sensory perception. It contains a vast network of sensory receptors that contribute to the skin's protective function by perceiving physical, biological, and environmental cues and generating relevant responses.
There are two main categories of receptors on the skin: capsulated and non-capsulated. The non-capsulated ones are mainly the pain receptors. The capsulated ones can be further categorized based on the...
There are two main categories of receptors on the skin: capsulated and non-capsulated. The non-capsulated ones are mainly the pain receptors. The capsulated ones can be further categorized based on the...
6.7K
01:26Introduction to Special Senses
6.4K
Sensory receptors play an integral part in comprehending our external and internal environments. They receive diverse stimuli, converting them into the nervous system's electrochemical signals. This conversion occurs as the stimulus alters the sensory neuron's cell membrane potential, instigating the generation of an action potential. This action potential is subsequently transmitted to the central nervous system (CNS), which integrates with other sensory data or higher cognitive...
6.4K
00:53Sound Intensity Level
4.5K
Humans perceive sound by hearing. The human ear helps sound waves reach the brain, which then interprets the waves and creates the perception of hearing. The loudness of the environment in which a person is located determines whether they can distinguish between different sound sources.
The human ear can perceive an extensive range of sound intensity, necessitating the use of the logarithmic scale to define a physical quantity—the intensity level. It is a ratio of two intensities and...
The human ear can perceive an extensive range of sound intensity, necessitating the use of the logarithmic scale to define a physical quantity—the intensity level. It is a ratio of two intensities and...
4.5K
01:27Tactile and Chemical Senses
430
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.
430