Table 1.

Two-pathway paired-pulse facilitation between proximal (S1) and distal (S2) inputs in the stratum radiatum (mean ± SD)

	First pulse	Second pulsea	First pulse	Second pulseb
Interpulse interval (msec)	S1	S2	S2	S1
50	100%	98 ± 7%	100%	95 ± 6%
100	100%	99 ± 7%	100%	103 ± 7%

^a Change (percentage) in the S2 fEPSP slope amplitude after S1 stimulation.

^b Change (percentage) in the S1 fEPSP slope amplitude after S2 stimulation.