【科学60秒】你真的能够“了如指掌”吗？_英语听力练习mp3下载-科学-沪江听力酷

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【科学60秒】你真的能够“了如指掌”吗？

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It’s probably happened to you: a friend says, “I know this place like the back of my hand,” and then ___1___ to get you hopelessly lost. Well, it could be that they really did know it like the back of their hand. Because researchers have found that people don’t actually know their hands as well as they think they do. The study appears in the Proceedings of the National Academy of Sciences.
We all have “___2___” of our body parts. So when our hands or feet are out of sight, we still know pretty much where they are and what they look like. But just how accurate is our mental picture?
Scientists had volunteers place one hand, ___3___, under a board. And they asked the subjects to guess, by pointing to the board with their other hand, where their hidden knuckles and fingertips lay.
The results? Participants thought their hands were about two thirds wider and one third shorter than they really were. And their ___4___ got worse as they moved away from their thumbs. That’s interesting, because finger sensitivity declines as you head towards the pinky. So our mental body maps seem to reflect our ability to feel. Oh, and for their ___5___ results, let’s give the researchers a hand.