Fig. 7. The excitatory synaptic potential (EPSP) coupling ratios were smaller than the steady-state coupling ratios in each neuronal pair. (A) The steady-state coupling ratio measured by the end of the voltage deflections in this pair of neurones was 0.31. (B) Three synchronous pairs of EPSPs from the same pair of neurones as in A with coupling ratios of 0.2–0.26. (C) The EPSP coupling ratios plotted versus the steady-state coupling ratios of 12 pairs of cells. Each symbol is the average coupling ratio of 35 EPSPs. The line indicates a slope of 1 and highlights the fact that the steady-state coupling ratios are always larger than their corresponding EPSP coupling ratios. V₁ is the recording from one of the neurones and V₂ is the recording from the other.