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Polarization patterns in response to low-frequency electric field stimulation. Activation maps (isochronal contours of excitation times) are shown for stimulations 2.5 times the threshold (5 V/cm) and five times the threshold (10 V/cm) at 1 Hz, invoking a 1:1 response. Minimal propagation is noted at 5 V/cm, whereas whole-sample activation occurs at 10 V/cm. Movies of the activation are available as Supplementary Materials.
