For example, my first reaction to this comment was to pull out my dictionary and argue that my use of "impulsive" was right, because I knew what I meant when I wrote it and could find that meaning in a dictionary. Instead, I decided that it takes two to communicate, and that if you disagreed with the implications of the word, it was the wrong word to choose. So I abandoned the word in an attempt to become less wrong.

Kahneman wrote, in Thinking, Fast and Slow, that he wrote a book for gossips and critics — rather than a book for movers and shak... (Read more)(Click to expand thread. ⌘F to Expand All)Cmd/Ctrl F to expand all comments on this post

Good point. I normally don't like accusing others of bias, and I will continue to try to refrain from doing so when I'm involved in something that looks like a debate, but I agree that it is useful information that should not be discouraged.

We Change Our Minds Less Often Than We Think

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Over the past few years, we have discreetly approached colleagues faced with a choice between job offers, and asked them to estimate the probability that they will choose one job over another. The average confidence in the predicted choice was a modest 66%, but only 1 of the 24 respondents chose the option to which he or she initially assigned a lower probability, yielding an overall accuracy rate of 96%.

—Dale Griffin and Amos Tversky1

When I first read the words above—on August 1st, 2003, at around 3 o’clock in the afternoon—it changed the way I thought. I realized that once I could guess what my answer would be—once I could assign a higher probability to deciding one way than other—then I had, in all probability, already decided. We change our minds less often than we think. And most of the time we become able to guess what our answer will be within half a second of hearing the question.

How swiftly that unnoticed moment passes, when we can’t yet guess what our answer will be; the tiny window of opportunity for intelligence to act. In questions of choice, as in questions of fact.

The principle of the bottom line is that only the actual causes of your beliefs determine your effectiveness as a rationalist. Once your belief is fixed, no amount of argument will alter the truth-value; once your decision is fixed, no amount of argument will alter the consequences.

You might think that you could arrive at a belief, or a decision, by non-rational means, and then try to justify it, and if you found you couldn’t justify it, reject it.

But we change our minds less often—much less often—than we think.

I’m sure that you can think of at least one occasion in your life when you’ve changed your mind. We all can. How about all the occasions in your life when you didn’t change your mind? Are they as available, in your heuristic estimate of your competence?

Between hindsight bias, fake causality, positive bias, anchoring/priming, et cetera, et cetera, and above all the dreaded confirmation bias, once an idea gets into your head, it’s probably going to stay there.

1Dale Griffin and Amos Tversky, “The Weighing of Evidence and the Determinants of Confidence,” Cognitive Psychology 24, no. 3 (1992): 411–435.

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