The human brain is an amazing organ. On average it weighs just three pounds (1.5 kilograms) but has been called “the most complex thing in the universe” because it can solve problems quickly and accurately. However, sometimes our brains work in mysterious ways that scientists find hard to explain. One example of this is post-decisional dissonance. This is a complex name for something that is both common and simple. When people make a decision, they want to feel their choice was the right one. As a result, people often focus on the positive features of their choice in order to support the decision they made. Imagine, for instance, that a man buys a pair of black shoes. He might later say black was the better choice because it shows the dirt less than other colors even though this reason was not part of his original decision-making process. What is even more interesting is that recent research suggests washing our hands can affect our brains. Imagine, this time, that the man buys black shoes and then washes his hands. According to the research, this customer might now accept that either black or another color would have been a good choice. One theory that explains this puzzling finding is that handwashing helps our brains accept we made the right choice, so we no longer need to prove to ourselves that we did.
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