Fig. 7. Effects of bath application of the selective GABA_B agonist baclofen (0.5 µmol l^–1) on lung burst frequency response to application of the ₁-adrenoceptor agonist phenylephrine (Phe; 25 µmol l^–1) in (A) the pre-metamorphic (N=5) and (B) adult groups (N=4). To facilitate comparisons, control data from both stage groups (grey symbols, broken lines; N=6 in each group) were transposed from Fig. 4. Trigeminal neurograms (V, trigeminal nerve) presented below show representative respiratory-related activity recorded under each condition. Values are means ± s.e.m. ^*Values statistically different from baseline at P<0.05.