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Do you think you’re an extravert or anintrovert? To answer, you might immediately ponder how much you like going toparties and talking to strangers, or perhaps you’ve already got an answer givento you by one of those online quizzes that prompt such self-reflection. The troublewith these approaches of course is that they rely on honest insight and a heftydose of subjectivity. Maybe you quite like parties, for instance, but nowherenear as much your best friend –does that make you an extravert or not? 你认为你是外向还是内向的人？要回答这个问题，你或许会马上想到自己是否热衷于去派对和与陌生人聊天，或者你已经从那些自我评估的在线心理测试中得到了答案。这些方法的问题在于它们依赖于诚实的自省和大量的主观动因。也许你也很喜欢聚会，但是程度远不及你的闺蜜，那么你到底是不是外向型人格呢？ A completely different approach that getsround these problems involves using a lemon – more specifically, concentratedlemon juice. This is a test with a long history in personality psychology andit’s really easy to try out at home. You’ll need a cotton bud (or what’s calleda cotton swab or Q-tip in the US) with a short piece of thread tied exactly inthe middle of it. Now place one end of the cotton bud on your tongue for 20seconds. Next, put five drops of concentrated lemon juice onto your tongue,swallow, and then put the other end of the cotton bud onto your tongue for 20seconds. Finally, take the end of the cotton bud out of your mouth and hold thecotton bud dangling by the thread. The idea is to see whether it hangshorizontally, or whether the end that you used after the lemon juice hangslower because it is heavier. | 
