JERUSALEMAfter more than 77 years under constant fire, the neurotransmitters of Israeli Prime Minister Ariel Sharon's brain could be nearing a truce. 'These endless, often senseless patterns of never-ending discharge must come to an end,' a spokesman for Sharon's neurostructure told reporters. 'Activity has already slowed considerably since the violent blood-clot explosion in his brain earlier this month. We expect a total cessation of cranial nerve firings within two weeks.' Observers are unsure whether the cease-fire will bring peace to Sharon's war-torn cranial region, but they remain guardedly optimistic. 