Political ideology linked to subtle differences in brain structure, study finds | The study showed that conservative voters tend to have a slightly larger amygdala than progressive voters—by approximately the size of a sesame seed.

To be clear. The amygdala is the part of the brain responsible for processing fear, rage and anxiety.

What this article is alluding to is that conservatives may be generally more fearful, anxious, and full of rage.

Enlarged amygdalas are often associated with anxiety disorders, ptsd, short tempers, and the like.