Figure 6. The relationship between EMG and the development of the ‘notch’.

A, threshold electrotonus to a 100 ms depolarizing current set to 80% (dashed line), 100% (thin line), 120% (medium line) and 140% (thick line) of the threshold current for liminal EMG generated by a 12 ms wide test stimulus. B, detail from A (80%–▪; 100%–□; 120%–•; 140%–○) of threshold changes occurring at conditioning–test intervals between 5 ms and 50 ms. Data are means ± s.e.m. for three subjects (error bars shown in one direction only for clarity).