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1. Single axons were teased from the distal end of whole frog sciatic nerve and impulses were recorded with a suction electrode. The whole nerve trunk was stimulated using a gross electrode that was slowly moved for several centimetres along the length of the nerve. The threshold for initiation of an action potential showed periodic minima which were(More)
Tracking the firing threshold of membranes is best accomplished with threshold hunters, automatic devices that adjust stimulus strength so as to hold constant the probability of an all-or-none response. We present a formalism for analyzing the performance of threshold hunters. An index for error is defined between the threshold of the membrane and the(More)
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