No effect: A slices as n 14.1%; B any of 60 minutes, slices as n 28.3%; C mice as n 4.0%; D any of 60 minutes, mice as n 12.6% Potentiation reduced by 40%: A slices as n 64.9%; B any of 60 minutes, slices as n 81.2%; C mice as n 38.6%; D any of 60 minutes, mice as n 61.4% No effect, 12 + 12 mice: A slices as n 12.8%; B any of 60 minutes, slices as n 26.2%; C mice as n 4.1%; D any of 60 minutes, mice as n 11.6% Potentiation reduced by 40%, 12 + 12 mice: A slices as n 89.4%; B any of 60 minutes, slices as n 95.2%; C mice as n 76.4%; D any of 60 minutes, mice as n 89.4%