Dong, S. orcid.org/0000-0003-4782-5934, Gallagher, J. orcid.org/0000-0002-3341-175X, Jackson, A. et al. (1 more author) (2023) A Hand-Held Device Presenting Haptic Directional Cues for the Visually Impaired. Sensors, 23 (20). 8415. ISSN 1424-8220
Abstract
Haptic information is essential in everyday activities, especially for visually impaired people in terms of real-world navigation. Since human haptic sensory processing is nonlinear, asymmetric vibrations have been widely studied to create a pulling sensation for the delivery of directional haptic cues. However, the design of an input control signal that generates asymmetric vibrations has not yet been parameterised. In particular, it is unclear how to quantify the asymmetry of the output vibrations to create a better pulling sensation. To better understand the design of an input control signal that generates haptic directional cues, we evaluated the effect of the pulling sensations corresponding to the three adjustable parameters (i.e., delay time, ramp-down step length, and cut-off voltage) in a commonly applied step-ramp input signal. The results of a displacement measurement and a psychophysical experiment demonstrate that when the quantified asymmetry ratio is in a range of 0.3430–0.3508 with an optimised cut-off voltage for our hand-held device, the haptic directional cues are better perceived by participants. Additionally, the results also showed a superior performance in haptic delivery by shear forces than normal forces.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2023 by the authors. This is an open access article under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits unrestricted use, distribution and reproduction in any medium, provided the original work is properly cited. |
Keywords: | asymmetric vibrations; illusory force sensation; directional cues; assistive device |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Mechanical Engineering (Leeds) > Institute of Engineering Systems and Design (iESD) (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 30 Nov 2023 10:50 |
Last Modified: | 30 Nov 2023 11:36 |
Status: | Published |
Publisher: | MDPI |
Identification Number: | 10.3390/s23208415 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:206036 |