This Illusion lets you ‘feel’ the invisible force field around your body
If you’ve ever caught yourself instinctively dodging an over-hanging branch or an uneven surface on the road based only on what your peripheral vision is telling you, congratulations, you’ve experienced a strange phenomenon known as your peripersonal space.
Like whiskers on cats tell them where their nose is in relation to their surroundings, our bodies are enveloped by an invisible ‘force field’, and neuroscientists have figured out how to make us feel it for the first time.
Most of us have a very strong feeling of personal space, and get super weirded-out when someone enters it uninvited, but you’d probably struggle to explain to somewhere where exactly the acceptable and creepy zones around you start and finish.
Fortunately, for scientists working in the field of neuropsychology, it’s their job to define interpersonal awkwardness, so they’ve have actually mapped out your own invisible bubble like so:
Pericutaneous space: The space immediately outside your body that can feel almost like someone is touching you if they enter it – for example, a feather might not be touching your skin, but if it’s in your percutaneous space, you might still experience the sensation of being tickled if it hovers close enough.
Peripersonal space: The space within arm’s or leg’s reach. So to be “within arm’s length” of you is to be within your peripersonal space.
Extrapersonal space: The space that occurs outside your reach.
So if you wave your arms and legs around, all that is the invisible force field that your brain has created to better perceive the world around it, and neuroscientists from the Karolinska Institute in Sweden have finally figured out how to make people actually perceive this.
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