Fig.8. Recordings of lung pressure (PL) and raw electroneurograms from the trigeminal (V_m) and vagus (X_l) nerves during tonic inflation of the lungs to 0, 2 and 4cmH₂O pressure (ventilated with 3% CO₂ in air). At 0cmH20, discharge in V_m commences (solid line) before discharge in X_l (inflation breath). At 2cmH₂O, both nerves commence discharge at roughly the same time (solid line, balanced breath). At 4cmH₂O, discharge in X_l commences (solid line) before discharge in V_m (deflation breath).