Fig. 8.

Nonpacemaker inspiratory neuron bursting ceases in 3 mm [K⁺]_o aCSF.A, ∫PBC (top trace) and inspiratory neuron activity during replacement of 8 mm[K⁺]_o aCSF with aCSF having 3 mm [K⁺]_o (arrow indicates onset of aCSF exchange). Note that the neuron hyperpolarizes in 3 mm [K⁺]_o aCSF.B, Expanded record of inspiratory neuron activity in 8 mm [K⁺]_o.C, Both population and neuron activity remain silent in 3 mm [K⁺]_o aCSF with blockade of glutamatergic input with CNQX and CPP. Calibration: (B) B, C, 10 mV, 1 sec.