可否解释下cognitive dissonance?

Cognitive dissonance is the mental discomfort that occurs when new information  conflicts with previously held beliefs or cognitions. To resolve this dissonance, people may
notice only information of interest (selective exposure), ignore or modify information that conflicts with existing cognitions (selective perception), or remember and consider only
information that confirms existing cognitions (selective retention). Aspects of these behaviors are contained in the biases categorized as belief perseverance.