This is the problem, the article is written in such a loose way it's easy to take away slightly incorrect conclusions. It doesn't actually say (2), what it says

This is the problem, the article is written in such a loose way it's easy to take away slightly incorrect conclusions. It doesn't actually say (2), what it says is that the amygdala is larger in those who are right wing, and then there's lots of language that dances very close to "and right wing people are mentally rigid" without quite stating it outright. Because she wants to sound neutral this notion of being ideological gets inserted into the middle, and she recognizes there are strongly ideological people on the left, but it wouldn't match the conclusions of the study to say that ideological people have a bigger amygdala.