What comes to mind first gets counted as what happens most.
脑子里先冒出来的那件，被当成了最常发生的那件。
Named by Tversky and Kahneman in Cognitive Psychology, 1973. Asked whether K falls more often at the start of a word or in third place, 105 of 152 people chose the start; the median guess was two to one.
一九七三年那篇论文里做的测试，问的是同一个字母在词头多，还是在第三个位置多。一百五十二个人里一百零五个选了词头——不是算出来的，是想得起来的。
The train was cancelled twice this year and ran on every other day. Leaving half an hour early forever is built on the two.
车今年停开过两回，别的日子都来了。可提前半小时出门这个习惯，是那两回定下来的。这条我经常犯。
The usual fix, go and list more counterexamples, runs on the same machinery. Schwarz and colleagues, 1991: people asked for twelve examples of their own assertiveness came out rating themselves less assertive than people asked for six. Difficulty gets read as evidence.
想纠正它，一般是逼自己多举反例。可举到第十二个就开始费劲，那份费劲本身又被当成了证据，反而更信原来那个判断。