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The device comprises a hexagonal array of 19 actuators, which provide haptic feedback. Credit: Northwestern University
A Northwestern University-led team of engineers has developed a new type of wearable device that stimulates the skin to deliver various complex sensations.
The thin, flexible device gently adheres to the skin, providing more realistic and immersive sensory experiences. Although the new device obviously lends itself to gaming and virtual reality (VR), the researchers also envision applications in health care. For example, the device could help people with visual impairments “feel” their surroundings or give feedback to people with prosthetic limbs.
The study will be published on Wednesday (Nov. 6) in the journal Nature.
The device is the latest advance in wearable technology from Northwestern bioelectronics pioneer John A. Rogers. The new study builds on work published in 2019 in Nature, in which his team introduced “epidermal VR,” a skin-interfaced system that communicates touch through an array of miniature vibrating actuators across large areas of the skin, with fast wireless control.
“Our new miniaturized actuators for the skin are far more capable than the simple ‘buzzers’ that we used as demonstration vehicles in our original 2019 paper,” Rogers said. “Specifically, these tiny devices can deliver controlled forces across a range of frequencies, providing constant force without continuous application of power.
“An additional version allows the same actuators to provide a gentle twisting motion at the surface of the skin to complement the ability to deliver vertical force, adding realism to the sensations.”
Rogers is the Louis A. Simpson and Kimberly Querrey Professor of Materials Science and Engineering, Biomedical Engineering and Neurological Surgery, with appointments in Northwestern’s McCormick School of Engineering and Northwestern University Feinberg School of Medicine. He also directs the Querrey Simpson Institute for Bioelectronics.
Rogers co-led the work with Northwestern’s Yonggang Huang, the Jan and Marcia Achenbach Professorship in Mechanical Engineering at McCormick; Hanqing Jiang of Westlake University in China; and Zhaoqian Xie of Dalian University of Technology in China. Jiang’s team built the small modifying structures needed to enable twisting motions.
Leveraging skin-stored energy
The new device comprises a hexagonal array of 19 small magnetic actuators encapsulated within a thin, flexible silicone-mesh material. Each actuator can deliver different sensations, including pressure, vibration and twisting. Using Bluetooth technology in a smartphone, the device receives data about a person’s surroundings for translation into tactile feedback—substituting one sensation (like vision) for another (touch).
A user wears the new device on her neck for sensory feedback. Credit: Northwestern University
Although the device is powered by a small battery, it saves energy using a clever “bistable” design. This means it can stay in two stable positions without needing constant energy input. When the actuators press down, it stores energy in the skin and in the device’s internal structure. When the actuators push back up, the device uses the small amount of energy to release the stored energy.
So, the device only uses energy when the actuators change position. With this energy-efficient design, the device can operate for longer periods of time on a single battery charge.
“Instead of fighting against the skin, the idea was ultimately to actually use the energy that’s stored in skin mechanically as elastic energy and recover that during the operation of the device,” said Matthew Flavin, the paper’s first author.
“Just like stretching a rubber band, compressing the elastic skin stores energy. We can then reapply that energy while we’re delivering sensory feedback, and that was ultimately the basis for how we created this really energy-efficient system.”
At the time of the research, Flavin was a postdoctoral researcher in Rogers’ lab. Now, he is an assistant professor of electrical and computer engineering at the Georgia Institute of Technology.
Sensory substitution
To test the device, the researchers blindfolded healthy subjects to test their abilities to avoid objects in their path, change foot placement to avoid injury and alter their posture to improve balance.
One experiment involved a subject navigating a path through obstructing objects. As the subject approached an object, the device delivered feedback in the form of light intensity in its upper right corner. As the person moved nearer to the object, the feedback became more intense, moving closer to the center of the device.
With only a short period of training, subjects using the device were able to change behavior in real time. By substituting visual information with mechanical, the device “would operate very similarly to how a white cane would, but it’s integrating more information than someone would be able to get with a more common aid,” Flavin said.
“As one of several application examples, we show that this system can support a basic version of ‘vision’ in the form of haptic patterns delivered to the surface of the skin based on data collected using the 3D imaging function (LiDAR) available on smartphones,” Rogers said.
“This sort of ‘sensory substitution’ provides a primitive, but functionally meaningful, sense of one’s surroundings without reliance on eyesight—a capability useful for individuals with vision impairments.”
Citation:
New haptic patch transmits complexity of touch to the skin (2024, November 6)
retrieved 6 November 2024
from https://techxplore.com/news/2024-11-haptic-patch-transmits-complexity-skin.html
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part may be reproduced without the written permission. The content is provided for information purposes only.
Home-worker’s perceptions of their workload and their ability to switch off after the working day are among a list of factors associated with health and well-being related behaviors.
New research from the Institute of Psychiatry, Psychology & Neuroscience (IoPPN) at King’s College London has found that home-worker’s perceptions of their workload and their ability to switch off after the working day are among a list of factors associated with health and well-being related behaviors.
The research, published in Behavioural Sciences, highlights how there can be clear positives to home-working when there are organizational policies in place that support practices conducive to a worker’s health and well-being.
The COVID-19 pandemic and ensuing lockdown led to a sharp rise in home-working among employees that would normally be office based. While extensive research has been conducted on promoting health and well-being among office workers, public health initiatives have largely overlooked the potential impact of home-working on health.
Researchers in this study wanted to establish the acute psychological effects of home-working on health and well-being related behaviors to better understand how these responses interact with one another.
In all, 491 participants were surveyed on a range of psychological responses to home-working practices and health-related behaviors, including measuring how capable home-workers were able to transform workspaces, the amount of time they remained sedentary during the working day, and the quality of their sleep. Analyses revealed the psychological responses to home-working practices could be grouped into four distinct clusters:
Home-working independence
Home-working transition
Daily work pressure
Work-day forecast
Dr. Samuel Keightley, the study’s first author from King’s IoPPN said, “This study illustrates that home-working exhibits similar but unique patterns, highlighting distinct responses to home-working practices that influence the health and well-being of home-based workers. These findings underscore the need to better understand and adjust home-working practices to support healthy behaviors and overall well-being.”
Researchers established a complex picture of associated behaviors. A worker’s perception of their workload manageability, an inability to feel like they can switch off in the evening, and a lack of autonomy all had cascading effects on health behaviors such as sitting and physical activity, and aspects of work-related well-being such as stress and burnout.
In contrast, participants who said that they were able to plan their working day had increased job satisfaction and well-being as well as a reduction in work-related and overall sedentary behavior.
Dr. Myanna Duncan, an Associate Professor in Occupational Psychology at King’s IoPPN and the study’s senior author said, “This study does not conclude that home working is inherently good or bad. Home-working has the potential to negatively impact certain health behaviors, which in the longer term could result in increased levels of stress and burnout.
“Equally, those participants who felt they had greater autonomy over their working day were associated with greater satisfaction and better health behaviors.
“If home working is to continue, it is vital that public health initiatives reflect the nuanced stressors that they can present to ensure that the benefits are maximized.”
More information:
Samuel Keightley et al, Psychological Responses to Home-Working Practices: A Network Analysis of Relationships with Health Behaviour and Wellbeing, Behavioral Sciences (2024). DOI: 10.3390/bs14111039
Citation:
Public health initiatives needed to promote healthy working at home, say researchers (2024, November 6)
retrieved 6 November 2024
from https://phys.org/news/2024-11-health-healthy-home.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
part may be reproduced without the written permission. The content is provided for information purposes only.
Firefighters work to control a blaze in California in July
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2024 is now almost certain to become the first year on record when average temperatures exceed 1.5°C above pre-industrial levels, breaching the threshold set by the Paris Agreement.
“At this point, barring an asteroid impact or a massive volcanic eruption… I think it’s safe to say this will be the first year above 1.5 degrees,” says Zeke Hausfather at US non-profit Berkeley Earth.
Last year, the average surface temperature across the globe was 1.45°C above the…