occurs from the direct influence of desire on beliefs. When people would like a certain idea/concept to be true, they end up believing it to be true. They are motivated by wishful thinking. This error leads the individual to stop gathering information when the evidence gathered so far confirms the views (prejudices) one would like to be true.
This video from Above the Noise • PBS explains what is going on in a popular way. It even resorts to brain scans!
Word of warning, though. It inevitably suffers from its own confirmation bias. Right up front, it produces a graph comparing Facebook clicks on “fake news” articles compared with clicks on “mainstream news” articles!! As if that is a proper analysis.
We all know mainstream media regularly publishes fake news. What they are probably comparing is Facebook clicks for mainstream media articles compared with alternative media articles. That is just not an intelligent differentiation when talking about “fake news.”
So take the video with a grain of salt. Look at it critically and intelligently.
In fact, probably the best way of avoiding, or at least reducing confirmation bias is to approach all information, from whatever source, critically and intelligently. To think for oneself. Avoid group thinking and official interpretations.