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.
Before 1899, the majority party floor leader had traditionally been the Chairman of the House Ways and Means Committee, the most powerful committee in the House, as it generates the Bills of Revenue specified in the Constitution as the House's unique power.