[adolph]

I'm not certain but in considering your question I came to: Political polarization is a network of cognitive biases which decreases mental models' connection to the reality that people agree on more things than disagree.

[lostmsu]

> Political polarization is the extent to which opinions on an issue are opposed, and the process by which this opposition increases over time.

From wiki. Seems obvious. Where did you get, that is has anything to do with cognitive biases?