I consider myself a non-judgmental person and that I control how I think. A new study suggests I might be wrong.
Researchers attempted to reduce people's unconscious prejudices such as sexism or racism. They played music to the participants whilst showing them pictures that challenged stereotypes. Only those who had the same music played to them during a subsequent nap retained the new associations.
I don't think this is a good way to tackle prejudice. I think learning to deliberately challenge my biases would last longer and make me a better person.