[Relationship between the characteristics of the acid stimulus and the impulse activity of medulla oblongata neurons in Cyprinus carpio carp].

In experiments on immobilized carps, by means of extracellular recordings, studies have been made of the neuronal activity of the facial lobe in the medulla evoked by stimulation of skin chemoreceptors of the mouth opening with hydrochloric and cytric acids. Responses of the neurons to these stimuli exhibit both similarities and differences. Composing across-neuron patterns, some aspects of coding of quality and intensity of chemical stimulus in fish were elucidated. Particularly it was shown that at low concentrations of acids, in neuronal coding of the stimuli the key role is played by qualitative peculiarities of the latter, but not by the level of pH.