ON THE RELATION OF STRENGTH-FREQUENCY CURVE IN EXCITATION BY LOW FREQUENCY A. C. TO THE MINIMAL GRADIENT OF THE NERVE FIBER

Abstract

Threshold determinations were made with low frequency A. Cs. on single nerve fiber preparations of the toad. The minimal gradient and the rheobase of the fiber was determined by stimulating the nerve fiber with exponentially increasing currents. The threshold voltage of the A. C. becomes higher, as the frequency becomes lower. The observed values were well in accordance with Hill-Tasaki's formula.