why do people struggle to walk in a straight line when they’re blindfolded?
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Our brains are pretty spectacular, using a wide range of senses and cues to perform various complex tasks. When walking, your brain uses visual cues to help orient and stabilize yourself – suddenly take one of those away, and it will take time to adjust.
Your legs are not exactly the same length. As such, you tend to curve off to the short side over time. When your eyes are open, your brain corrects course without you really thinking about it. When the check is gone, off you go
ELI5 version: Humans rely on a three-part balance system. Eyes (Visual). Ears (Vestibular). Feet (Somatosensory). If you take away the eyes, you are relying on 2/3 of your balance system, thus making you unstable.
Source: Doctorate degree of Physical therapy and rehab medicine
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