Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
a Current–voltage characteristic (I–V curves) of the persistent sodium current (I nap), calcium current (I ca), N-methyl-D-aspartate current (I nmda) and leak current (I leak), and negative slope conductance region (arrow). b Positive feedback between depolarization and the activation variable that increases the inward currents regeneratively and creates the negative slope conductance region
