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.
Mitch McConnell is the Senate Majority Leader. Elected to that position unanimously by his Republican colleagues in 2014, he is only the second Kentuckian to ever serve as Majority Leader in the U.S. Senate. The first, Alben Barkley, led the Democrats from 1937 to 1949.