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Strength-duration dependence of the upper and lower thresholds of stimulation for rectangular cathodic pulses. The stimulation range (spikes, ●) lies between the lower and upper stimulation thresholds. No APs are elicited outside this range (no spikes, ×). The lower and upper thresholds are defined as having a 50% elicitation probability. The number of independent data points shown is 86; τ, stimulus duration.
