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.
Leader of the majority party in the House of Representatives. By tradition, the Speaker is the head of the majority party in the House. This means the Speaker is held responsible for passing legislation supported by the majority party. The Speaker usually has a less prominent role as party leader when the president belongs to the same party.