Fig. 2.

Hypoxic ventilatory responses of lambs for pre- and postlesion experiments. ΔVentilation represents change in ventilation from normoxic control. Hypoxic ventilatory decline is represented by %decrement in Δventilation from maximum increase referenced to peak augmentation. A: lambs with thalamic lesions involving Pf (n = 5). B: lambs with thalamic lesions external to Pf (n = 6). *P < 0.005 and **P < 0.03 compared with augmentation. †P < 0.005 compared with prelesion at the same time. ‡P < 0.05 compared with thalamic lesions sparing Pf at the same time.