I believe that the "left" and "right" designations in politics come from the fact that long ago, the conservatives sat to the right of the throne whereas the progressives sat to the left. Any association with brain function is completely coincedental (then again it is believed by some that any brain function in politicians is completely coincedental!).
It was mentioned in another thread that in the U.S. "liberal" has become almost synonomous with "socialist". I think that is just a reflection of the deep polarity of American politics, a result of a most curious and rare situation wherein there are only two political parties. This instills in the American mind a dichotomy, a "with us or against us" mindset that was also proclaimed by the President last year and so angered the people of other nations that have a multi-party system and do not understand the dualistic nature of American politics or society.
It was mentioned in another thread that in the U.S. "liberal" has become almost synonomous with "socialist". I think that is just a reflection of the deep polarity of American politics, a result of a most curious and rare situation wherein there are only two political parties. This instills in the American mind a dichotomy, a "with us or against us" mindset that was also proclaimed by the President last year and so angered the people of other nations that have a multi-party system and do not understand the dualistic nature of American politics or society.