Figure 6.

Kynurenic acid eliminate the respiratory modulation of RTN neurons. a1, a2, Excerpt of original recordings showing the discharge pattern of the same neuron before and after KYN administration (rat with intact vagus nerves). b1, b2, Perievent activity histograms of the same neuron before and after KYN. The histograms were triggered on tracheal CO₂. c1, c2, Interspike interval distribution histogram for the same cell before and after KYN administration. The mean discharge rate of the cell was the same at the time when the histograms were made (10 Hz). a.u., Arbitrary units.