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 majority leader is usually the most influential person in the Senate. He has the privilege of beginning debates on legislation, and he usually influences choices for committee assignments. He shares his power with the minority leader, who leads the other party.