Leftward Optical Shift Induces Bias in Line Bisection: A Study with Healthy Subjects Using a Head-mounted Display

Immediate effect of adding mirror visual feedback to lateral weight-shifting training on the standing balance control of the unilateral spatial neglect model

“…As we know, former studies reported that actual USN patients were confused with MFV [20][21][22][23] . In comparison, the USN model condition with its HMD interferes and makes it difficult for the individual to process visual information that affected the postural balance [40][41][42][43][44] . Accordingly, the significant difference between the MVF and non-MVF subgroup only showed in some variables.…”

“…During the pre-test, training task, and post-test, all participants wearing the USN model of HMD (Virtual reality headset for mobile phone with 3D glasses) and smartphone (Galaxy S6 edge, SCV31, Samsung Electronics Japan Co., Ltd) with a web camera (SVPro VR 3D camera) mounted on the head and covered the eyes. This USN model procedure is adopted and the same as the previous study protocol 43,44) . The USN model used a modification of visual direction web camera on HMD of 10 degrees to the right to resemble a mild USN situation (Fig.…”

“…HMD modification as the USN model use procedure was explored in healthy participants. The prism glass, which was substituted by a web camera and HMD modification in healthy participants, can project a more appropriate visual orientation direction and optically shift more to the right emulated the left USN patients 43) . Its use modulated the postural balance control change due to deviations of the web camera's visual direction that resembled an actual USN situation 43,44) .…”

“…The prism glass, which was substituted by a web camera and HMD modification in healthy participants, can project a more appropriate visual orientation direction and optically shift more to the right emulated the left USN patients 43) . Its use modulated the postural balance control change due to deviations of the web camera's visual direction that resembled an actual USN situation 43,44) . Thus, the present study applied HMD modification with a tilted web camera on healthy participants as the USN model.…”

Validity and reliability of standing balance control measurement on the left unilateral spatial neglect model

“…4,15,16 The HMD with a tilted web camera was estimated to affect a visual perception to coordinating hand and eye movements in performing a reaching task. 17 The static and dynamic balance in a virtual environment is perceived through an HMD and physical environment. 18,19 Furthermore, the use of HMD with eyesopened affects an increase of the body sway during a standing posture.…”