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Fig. 1. (A) Schematic representation of bullfrog brainstem showing the Raphé
stimulation site. (BD) Integrated (top trace) and raw (bottom trace)
trigeminal neurograms from a pre-metamorphic tadpole, (B) under baseline
condition, (C) during and after electrical stimulation of the medullary
Raphé with drug-free artificial cerebrospinal fluid (aCSF) and (D) in
the presence of methiothepin in aCSF (50 µmol l1). (E)
The changes in respiratory-related motor output after a 20-min `wash out'
period with drug-free aCSF.