Fig. 3.

Scatterplot of heteronymous (LG-S) EPSP amplitude versus modulation (see Fig. 1e):

$$167 \text{Hz modulation} (\%)=100\left[\left[\frac{(EPSP30+EPSP31)÷2}{EPSP1}\right]-1\right].$$

Open and filled arrows indicate mean values in untreated and axotomized rats, respectively. The linear correlation between amplitude and modulation was significant for both groups (r = −0.37; p = 0.02;n = 39; and r = −0.55;p < 0.001; n = 42; untreated and 3 d axotomy, respectively).