20/20 Magazine

Vision, the Brain, and Mobility by Linda Conlin, Pro to Pro Managing Editor

The eyes are continuously streaming real-time spatial and environmental data directly into the brain, which processes this visual information to regulate split-second motor adjustments. This seamless sensorimotor integration acts as an internal radar. Vision can improve upright stability during standing and locomotion. However, during locomotion, vision supports additional behaviors such as gait cycle modulation (one gait cycle is measured from heel-strike to heel-strike), navigation, and obstacle avoidance. Unlike during standing, vision plays many roles during locomotion, providing information for upright stability as well as body position relative to the external environment. Vision acts as the navigation radar for human locomotion, transmitting environmental information to the brain and regulating motor decisions through sensorimotor integration. When that radar is suddenly blinded or degraded, the brain loses its primary mapping tool and is forced to remodel how it processes movement to keep the body upright and stable.

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