Neuronal firing threshold
= Neuronal firing threshold
{title2=$\vartheta$}
A <neuronal firing threshold> specifies the condition for initiating an <action potential>. The <leaky integrate-and-fire model> uses a prescribed <membrane potential> $\vartheta$; real initiation involves active <voltage-gated ion channels> and depends on recent activity and recording site. A threshold drawn on a passive voltage trace is a comparison criterion, not a simulated <action potential>.