00:19When you are on board the ISS in weightlessness, the movement becomes
00:23symmetric because there is no more gravitation effect of gravity. So which
00:27means that you have to squeeze as much when you are at the top than when you are on the
00:32bottom, which is not the case on Earth. Because on Earth, the risk of slippage is only at the
00:36bottom. At the top, there is no risk of slippage. And so we could observe, we were expecting
00:41the astronaut after a few repetitions, at least after a few months, to squeeze the object
00:46in a fully symmetric way. And we saw that it was not the case. So what we observed was
00:52that the astronaut was gripping the object more when they are at the top than at the
00:58bottom. So this is why we uncover the kind of illusions. The brain somehow overcompensate
01:04the expectation. And so this is why they squeeze more at the top than at the bottom.
01:20It was very interesting because what we showed is that the first few movements, they were
01:26really still having memory of weightlessness environment. So there was a potential hazard
01:32because they did not grip the object optimally. But what was very interesting is that after
01:38a few tenths of repetitions, they recovered the normal behavior. What this shows is that
01:43when they returned back to Earth, they relearned the Earth's environment much faster than they
01:48learned the microgravity environment.
02:06If we prepare astronauts to go to land on the moon, for instance, in that case, they might
02:13need some specific training because the way they are going to manipulate objects might
02:17be affected by partial gravity. So they might need some specific training because the way
02:20they might need some training on Earth just to make them adapt to a partial gravity environment.
02:26But that's another question, of course, that's for the future plants.
02:30Thanks for listening.
02:42Transcription by CastingWords
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