Spontaneous EPSP of Command Neurons in the Common Snail during Heterosynaptic Potentiation

The presynaptic mechanism of short-term plasticity of synaptic transmission was studied by analyzing the effects of rhythmic orthodromic stimulation of the intestinal nerve, inducing short-term potentiation of evoked EPSP, on spontaneous EPSP in defensive behavior command neurons in the common snail. Rhythmic stimulation had no effect on the amplitude of spontaneous EPSP but led to significant increases in the number of spontaneous EPSP. The increase in the frequency of spontaneous EPSP suggested a role for a presynaptic mechanism in the short-term potentiation of synaptic transmission. This presynaptic mechanism may include a decrease in the action potential generation threshold (AP) in presynaptic neurons, which leads to an increase in the proportion of spontaneously active neurons and, thus, supports an increase in the number of spontaneous presynaptic AP.

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