[A mathematical model of the activity of spinal generators of rhythmic movements].

Different organization schemes concerning locomotor and scratching rhythmicity generators are analyzed by means of the mathematical simulation model. A functional group of neurons (half-centre constructed on the stochastically organized neuronal network) is the basis for generator. Some organization schemes concerning locomotor and scratching rhythmicity generators are considered, such as: two half-centres with reciprocal inhibitory connections and tonic excitatory influences on these half-centres: two half-centres with inhibitory-excitatory connections and tonic excitatory influences on one half-centre; ring structures consisting of more than two functional groups of neurons with excitatory and inhibitory connections between them. In all the schemes considered generation of rhythmic activity is possible with time characteristics similar to those of the locomotor and scratching rhythmicity. It is shown that transition from locomotor to scratching rhythmicity can be realized through simply organized actions on generator neurons. Possible principles of construction of spinal generators for locomotor and scratching movements are discussed.