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Fig. 4. Dose-dependent changes in fictive buccal burst frequency during
noradrenaline (NA) application at different concentrations. NA application was
followed by a 30-90 min wash-out period. (A) Absolute buccal burst frequency,
(B) frequency data expressed as a percentage change from baseline values. In A
and B, data were obtained in pre-(triangles; N=11) and metamorphic
tadpoles (squares; N=7), and adult frogs (circles; N=4).
Values are expressed as means ± s.e.m. *Values statistically
different from baseline at P<0.05.