Symptoms of significant brain atrophy include progressive cognitive impairment involving multiple cognitive functions, otherwise known as dementia, seizures and aphasia, which is the disruption in the understanding or production of language or both.
The Senate majority leader has somewhat less official power than the Speaker of the House. This is because the vice president is technically the Senate's presiding officer, a ceremonial position that calls chiefly for casting a vote in the event of a tie.
The Speaker in the United States, by tradition, is the head of the majority party in the House of Representatives, outranking the Majority Leader. However, despite having the right to vote, the Speaker usually does not participate in debate and rarely votes.