235 research outputs found
Personalising Vibrotactile Displays through Perceptual Sensitivity Adjustment
Haptic displays are commonly limited to transmitting a discrete
set of tactile motives. In this paper, we explore the
transmission of real-valued information through vibrotactile
displays. We simulate spatial continuity with three perceptual
models commonly used to create phantom sensations: the linear,
logarithmic and power model. We show that these generic
models lead to limited decoding precision, and propose a
method for model personalization adjusting to idiosyncratic
and spatial variations in perceptual sensitivity. We evaluate
this approach using two haptic display layouts: circular, worn
around the wrist and the upper arm, and straight, worn along
the forearm. Results of a user study measuring continuous
value decoding precision show that users were able to decode
continuous values with relatively high accuracy (4.4% mean
error), circular layouts performed particularly well, and personalisation
through sensitivity adjustment increased decoding
precision
A Review of Non-Invasive Haptic Feedback stimulation Techniques for Upper Extremity Prostheses
A sense of touch is essential for amputees to reintegrate into their social and work life. The design of the next generation of the prostheses will have the ability to effectively convey the tactile information between the amputee and the artificial limbs. This work reviews non-invasive haptic feedback stimulation techniques to convey the tactile information from the prosthetic hand to the amputee’s brain. Various types of actuators that been used to stimulate the patient’s residual limb for different types of artificial prostheses in previous studies have been reviewed in terms of functionality, effectiveness, wearability and comfort. The non-invasive hybrid feedback stimulation system was found to be better in terms of the stimulus identification rate of the haptic prostheses’ users. It can be conclude that integrating hybrid haptic feedback stimulation system with the upper limb prostheses leads to improving its acceptance among users
Holdable Haptic Device for 4-DOF Motion Guidance
Hand-held haptic devices can allow for greater freedom of motion and larger
workspaces than traditional grounded haptic devices. They can also provide more
compelling haptic sensations to the users' fingertips than many wearable haptic
devices because reaction forces can be distributed over a larger area of skin
far away from the stimulation site. This paper presents a hand-held kinesthetic
gripper that provides guidance cues in four degrees of freedom (DOF). 2-DOF
tangential forces on the thumb and index finger combine to create cues to
translate or rotate the hand. We demonstrate the device's capabilities in a
three-part user study. First, users moved their hands in response to haptic
cues before receiving instruction or training. Then, they trained on cues in
eight directions in a forced-choice task. Finally, they repeated the first
part, now knowing what each cue intended to convey. Users were able to
discriminate each cue over 90% of the time. Users moved correctly in response
to the guidance cues both before and after the training and indicated that the
cues were easy to follow. The results show promise for holdable kinesthetic
devices in haptic feedback and guidance for applications such as virtual
reality, medical training, and teleoperation.Comment: Submitted to IEEE World Haptics Conference 201
Electrotactile feedback applications for hand and arm interactions: A systematic review, meta-analysis, and future directions
Haptic feedback is critical in a broad range of
human-machine/computer-interaction applications. However, the high cost and low
portability/wearability of haptic devices remain unresolved issues, severely
limiting the adoption of this otherwise promising technology. Electrotactile
interfaces have the advantage of being more portable and wearable due to their
reduced actuators' size, as well as their lower power consumption and
manufacturing cost. The applications of electrotactile feedback have been
explored in human-computer interaction and human-machine-interaction for
facilitating hand-based interactions in applications such as prosthetics,
virtual reality, robotic teleoperation, surface haptics, portable devices, and
rehabilitation. This paper presents a technological overview of electrotactile
feedback, as well a systematic review and meta-analysis of its applications for
hand-based interactions. We discuss the different electrotactile systems
according to the type of application. We also discuss over a quantitative
congregation of the findings, to offer a high-level overview into the
state-of-art and suggest future directions. Electrotactile feedback systems
showed increased portability/wearability, and they were successful in rendering
and/or augmenting most tactile sensations, eliciting perceptual processes, and
improving performance in many scenarios. However, knowledge gaps (e.g.,
embodiment), technical (e.g., recurrent calibration, electrodes' durability)
and methodological (e.g., sample size) drawbacks were detected, which should be
addressed in future studies.Comment: 18 pages, 1 table, 8 figures, under review in Transactions on
Haptics. This work has been submitted to the IEEE for possible publication.
Copyright may be transferred without notice, after which this version may no
longer be accessible.Upon acceptance of the article by IEEE, the preprint
article will be replaced with the accepted versio
Haptics: Science, Technology, Applications
This open access book constitutes the proceedings of the 12th International Conference on Human Haptic Sensing and Touch Enabled Computer Applications, EuroHaptics 2020, held in Leiden, The Netherlands, in September 2020. The 60 papers presented in this volume were carefully reviewed and selected from 111 submissions. The were organized in topical sections on haptic science, haptic technology, and haptic applications. This year's focus is on accessibility
Investigating Social Haptic Illusions for Tactile Stroking (SHIFTS)
A common and effective form of social touch is stroking on the forearm. We
seek to replicate this stroking sensation using haptic illusions. This work
compares two methods that provide sequential discrete stimulation: sequential
normal indentation and sequential lateral skin-slip using discrete actuators.
Our goals are to understand which form of stimulation more effectively creates
a continuous stroking sensation, and how many discrete contact points are
needed. We performed a study with 20 participants in which they rated
sensations from the haptic devices on continuity and pleasantness. We found
that lateral skin-slip created a more continuous sensation, and decreasing the
number of contact points decreased the continuity. These results inform the
design of future wearable haptic devices and the creation of haptic signals for
effective social communication.Comment: To be published in IEEE Haptics Symposium 202
Tactile Weight Rendering: A Review for Researchers and Developers
Haptic rendering of weight plays an essential role in naturalistic object
interaction in virtual environments. While kinesthetic devices have
traditionally been used for this aim by applying forces on the limbs, tactile
interfaces acting on the skin have recently offered potential solutions to
enhance or substitute kinesthetic ones. Here, we aim to provide an in-depth
overview and comparison of existing tactile weight rendering approaches. We
categorized these approaches based on their type of stimulation into asymmetric
vibration and skin stretch, further divided according to the working mechanism
of the devices. Then, we compared these approaches using various criteria,
including physical, mechanical, and perceptual characteristics of the reported
devices and their potential applications. We found that asymmetric vibration
devices have the smallest form factor, while skin stretch devices relying on
the motion of flat surfaces, belts, or tactors present numerous mechanical and
perceptual advantages for scenarios requiring more accurate weight rendering.
Finally, we discussed the selection of the proposed categorization of devices
and their application scopes, together with the limitations and opportunities
for future research. We hope this study guides the development and use of
tactile interfaces to achieve a more naturalistic object interaction and
manipulation in virtual environments.Comment: 15 pages, 2 tables, 3 figures, surve
Haptics: Science, Technology, Applications
This open access book constitutes the proceedings of the 13th International Conference on Human Haptic Sensing and Touch Enabled Computer Applications, EuroHaptics 2022, held in Hamburg, Germany, in May 2022. The 36 regular papers included in this book were carefully reviewed and selected from 129 submissions. They were organized in topical sections as follows: haptic science; haptic technology; and haptic applications
Haptics: Science, Technology, Applications
This open access book constitutes the proceedings of the 12th International Conference on Human Haptic Sensing and Touch Enabled Computer Applications, EuroHaptics 2020, held in Leiden, The Netherlands, in September 2020. The 60 papers presented in this volume were carefully reviewed and selected from 111 submissions. The were organized in topical sections on haptic science, haptic technology, and haptic applications. This year's focus is on accessibility
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