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.
In 2009, for example, there were 397 roll call votes. According to the Senate Historian's office, only 39 of them were cloture votes. Indeed, we found plenty of major bills that did not require 60 votes to start or end debate, including a bill meant to give more children health insurance and a bill to prevent mortgage foreclosures.