Fig. 8.

Current distance relationships estimated using the refractory interaction technique with threshold stimulation intensities. A. Current distance constants estimated using different interelectrode distances (mean ± s.d. across three randomized populations). B. Current-distance curves estimated using only data from the 300 µm interelectrode distance to estimate k (dot), using data from 100, 200, and 300 µm interelectrode distances to estimate both I₀ and k (dash), or using data from only the 200 and 300 µm interelectrode distances to estimate both I₀ and k (dash-dot), and the optimal CDR obtained from the lower boundary (bold).