[Model study of neuronal mechanisms of distinguishing 2 tactile stimuli in the snail].
A simple two-layered neuronal network model consisting of afferent and efferent neurons was constructed on the basis of a study of neuronal structure of defensive reactions in snail. Synaptic and spike reactions of the efferent neurons in response to stimulation of the receptive fields of afferent neurons were studied. It has been shown that a reduction in the distance between two points of stimulation results in a gradual transformation of a bimodal distribution of synaptic and spike reactions of the efferent neurons to the one-modal. These changes in synaptic and spike reactions were in agreement with the reaction of the snail leg muscle to two tactile stimuli simultaneously applied to the skin of the leg. The ablation of the snail central nervous systems resulted in a more diffuse contractile reaction. It is suggested that the central and peripheral neuronal networks differ in the exactness of defensive reflex realizations.
D000818:Animals; D004192:Discrimination, Psychological / Q000502:physiology*; D005071:Evoked Potentials; D006372:Helix, Snails / Q000502:physiology*; D008959:Models, Neurological; D009415:Nerve Net / Q000502:physiology*; D009424:Nervous System Physiological Phenomena; D012677:Sensation / Q000502:physiology*; D013569:Synapses / Q000502:physiology; D009435:Synaptic Transmission
Model'noe issledovanie neĭronnykh mekhanizmov razlicheniia dvukh taktil'nykh stimulov u ulitki.