Figure 1.

Enhancement of single MPP fEPSP's by elevated [Ca²⁺]_o under normobaric conditions. (A) fEPSPs recorded at the inner dendritic area of the dentate gyrus at [Ca²⁺]_o 2 and 4 mM. (B) Statistical analysis of single fEPSPs amplitudes and slopes under 2, 4, (n = 6) and 6–8 mM [Ca²⁺]_o (n = 4). Note that maximal slope and amplitude were reached at 4 mM [Ca²⁺]_o, apparently reaching saturation since further increase of [Ca²⁺]_o to 6–8 mM resulted in no change or even depression of the fEPSPs (not significantly different from fEPSPs at 2 mM). Scatter bars indicate mean ± SE.