Areas of the cortex located just behind the temples containing the neurons responsible for the sense of hearing and meaningful speech. Frontal Lobes Areas of the cortex located in the front and top of the brain, responsible for higher mental processes and decision making as well as the production of fluent speech.
As a practical matter, some might argue, if a filibuster is threatened and it takes 60 votes to end debate in the Senate, then it does take 60 votes to pass a bill. Nothing in the Constitution says that a three-fifths majority is necessary to pass ordinary legislation.
At this point, as a political matter the final vote to end a filibuster is no different than the vote for final passage. (So, 60 is the new 50. Technically, 60 is the new 51, since a bill needs 51 votes to pass, but Reid needs only 50 senators. He can rely on Joe Biden, as president of the Senate, to break any tie votes.). At this point, the John Kerry rule kicks in.