Slices from AU and AI rats exhibit no differences in CA1 synaptic transmission and short-term facilitation.A, Input–output curves reveal depressed synaptic transmission for aged rats relative to young controls but were not different between AU and AI subgroups [Y, n = 9(7); AU, n = 9(7); AI, n = 19(8)]. B, Paired-pulse facilitation in CA1 was indistinguishable between young, AU, and AI groups across a range of interstimulus intervals (ISI).Inset shows a representative trace (young rat). Calibration: 2 mV, 10 msec.