Stimulation of the ON after a gabazine injection into the medOB can induce fictive swimming.

(A, B) Responses of a RS neuron to electrical stimulation of the ON (10 μA) before (A) and after (B, top trace) a local injection of gabazine (1 mM) in the medOB. Bottom traces in (B) show the neural activity in the iVR and cVR. (C) Details from the gray area in (B) showing fictive locomotion that is characterized by rhythmic alternating ventral root discharges on the iVR and cVR sides. The data and statistics on trials can be found in S1 Data. cVR, contralateral ventral root; iVR, ipsilateral ventral root; medOB, medial part of the olfactory bulb; ON, olfactory nerve; RS, reticulospinal.