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The recently developed miniaturized head-mounted two-photon (2P) imaging devices have served as a valuable tool for neuroscientists, enabling real-time functional neural imaging in freely-behaving animals. Although the current 2P fiberscopes and miniscopes are lightweight, the weight of any potential additional accessories inevitably imposes a burden on the animal. Here, we present a buoyancy levitation method to alleviate head-mounted weight burden on mice. By utilizing the buoyance of a helium-filled balloon to counteract the additional weight of up to 7 g, both the motion behavior and neural activities remain unaffected by the added load. This easy-to-implement method provides a platform for studying neural network function in animals, effectively freeing them from the burden of head-mounted weight.
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http://dx.doi.org/10.21203/rs.3.rs-5247340/v1 | DOI Listing |
Gait Posture
August 2025
Department of Kinesiology, Sport, and Hospitality Management, College of Education and Human Development, George Mason University, 10890 George Mason Circle, Katherine Johnson Hall, 201G 4E5, Manassas, VA 20110, USA; Department of Health and Kinesiology, University of Utah, Salt Lake City, UT, USA.
Introduction: Both fall-related anxiety and cognitive demands affect balance and gait without additional motor complexity. High elevation settings in virtual reality elicit 'stiffening of posture' (i.e.
View Article and Find Full Text PDFAugmented reality (AR) technology overlays digital content onto the real world, in contrast to virtual reality (VR), which immerses users in a fully virtual environment. This fundamental distinction enables AR users to maintain continuous interaction with their physical surroundings while receiving enhanced digital information. In AR system design, optimizing both perspective effects and imaging performance is crucial.
View Article and Find Full Text PDFJMIR Res Protoc
June 2025
Division of Respiratory & Critical Care Medicine, Department of Medicine, National University Health System, Singapore, Singapore.
Background: While traditional mindfulness-based interventions demonstrate effectiveness in improving mental health outcomes, their delivery methods face significant challenges related to accessibility and engagement. Geographic barriers to trained facilitators, time constraints for in-person sessions, and participant dropout rates of 15% to 30% due to perceived monotony limit intervention reach and effectiveness. Virtual reality (VR) technology offers innovative solutions through multisensory immersion that creates presence, the subjective feeling of "being there," enhancing attention regulation and reducing external distractions.
View Article and Find Full Text PDFSci Rep
May 2025
Department of Electrical and Computer Engineering, Johns Hopkins University, Baltimore, MD, 21218, USA.
The recently developed miniaturized head-mounted two-photon (2P) imaging devices have served as a valuable tool for neuroscientists, enabling real-time functional neural imaging in freely-behaving animals. Although the current 2P fiberscopes and miniscopes are lightweight, the weight of any potential additional accessories inevitably imposes a burden on the animal. Here, we present a buoyancy levitation method to alleviate head-mounted weight burden on mice.
View Article and Find Full Text PDFNat Nanotechnol
June 2025
Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Republic of Korea.
An ideal waveguide display for augmented reality would feature a single-layer waveguide substrate combined with dispersion-free couplers. While metasurfaces have been explored as a potential solution for waveguide displays, severe limitations-such as low efficiency, poor uniformity and chromatic aberration-remain unresolved. Here we introduce a single-layer waveguide display using achromatic metagratings.
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