Inhibitory postsynaptic potential
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Inhibitory Postsynaptic Potential is commonly abbreviated to IPSP. Impulses are transmitted from neuron to neuron by the release of a chemical transmitter across synaptic clefts from the synaptic vesicles along the axon to the postsynaptic receptors of another neuron. An EPSP has the effect of depolarizing--driving the charge to positive--a neuron and the IPSP has the effect of hyperpolarizing--driving the charge farther negative--it. In general, having more positive ions (or less negative ones) inside the cell will increase the chance (and thus, rate) of action potential firing. Conversely, driving a cell to negativity will usually lower the firing rate.
Currently there is more information available under the heading synapse.
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