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Neural Computation, Vol 9, 1001-1013, Copyright © 1997 by The MIT Press

LETTERS

Shunting Inhibition Does Not Have a Divisive Effect on Firing Rates

Gary R. Holt and Christof Koch

Shunting inhibition, a conductance increase with a reversal potential close to the resting potential of the cell, has been shown to have a divisive effect on subthreshold excitatory postsynaptic potential amplitudes. It has therefore been assumed to have the same divisive effect on firing rates. We show that shunting inhibition actually has a subtractive effect on the firing rate in most circumstances. Averaged over several interspike intervals, the spiking mechanism effectively clamps the somatic membrane potential to a value significantly above the resting potential, so that the current through the shunting conductance is approximately independent of the firing rate. This leads to a subtractive rather than a divisive effect. In addition, at distal synapses, shunting inhibition will also have an approximately subtractive effect if the excitatory conductance is not small compared to the inhibitory conductance. Therefore regulating a cell's passive membrane conductance -- for instance, via massive feedback -- is not an adequate mechanism for normalizing or scaling its output.


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