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Faster walking by moving the wall forwardVision-based speedometer regulates human walking 
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The visual scene on the eyes expands outward during walking. Such visual information is not only used to detect obstacles on the pathway, but is actually used to control walking in real time. Here we show that our automatic regulator of walking speed based on vision, which estimates and maintains the speed, is robust to changes in the depths. The robustness was not explained by temporal-frequency-based speed coding previously suggested to underlie depth-invariant object-motion perception. On the other hand, it broke down, not only when interocular distance was virtually manipulated, but also when monocular depth cues were deceptive. These observations suggest that our visuomotor system embeds a speedometer that calculates self-motion speed from vision by integrating monocular/binocular depth and motion cues. Elucidating these implicit visuomotor control mechanisms will help us for refining the technology and safety design of virtual reality devices.
[1] S. Takamuku, H. Gomi, “Vision-based speedometer regulates human walking,” iScience 24:103390, 2021. https://doi.org/10.1016/j.isci.2021.103390.
Hiroaki Gomi / Sensory and Motor Research Group, Human and Information Science Laboratory
Email: cs-openhouse-ml@hco.ntt.co.jp