Fig. 3.

Comparison of derived p with “maximal” p predicted from uniform decline inp during homosynaptic depression. Binomialp estimated from the best fit to amplitude histograms of EPSPs (pfit) or from calculation by Equations 2 (p intra) and 3 (p inter) is generally much greater than that predicted if homosynaptic depression were caused by a uniform decrease inp at all release sites (maximal p).Line has a slope of 1. See Results for definition of maximal p.