Fig. 3

Sample recordings of PHR and HG nerve activity (raw and integrated signals—∫) during normoxia (a) and changes of pre-inspiratory time of HG nerve activity (T pre-I) in respiratory response to hypoxia (b) after injection of vehicle (Sham) or 6-OHDA into the third brain ventricle. Note visible more prolonged T pre-I in 6-OHDA-treated rats in normoxia. All values are given as mean ± SEM. N normoxia, R recovery after the hypoxic stimulus. *p < 0.05; ^##p < 0.01. *—statistical significance versus the respective normoxia (N) value, #—significance between corresponding values in 6-OHDA and Sham group (n = 6–7)