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Membrane potential may determine whether a cell behaves as tonic or phasic. (A) A neuron that gave phasic responses at −60 mV (Vr) (top) became tonic when hyperpolarized to −90 mV by injecting current (bottom) (33%, n = 6 of 18). (B) Another cell, also phasic at −60 mV (Vr) (top), remained phasic at −90 mV (bottom) (67%, n = 12 of 18).
