v_rheobase

v_rheobase

by Laure Jeanne Gaëlle Vancauwenberghe -
Number of replies: 2

Hello, 

Regarding the paper Firing patterns in the adaptive exponential integrate-and-fire model, the potential V_T is defined (2. p.336) as "the current drives the potential beyond V_T the exponential term actuates a positive feedback which leads to the upswing (exponential I presume?) of the action potential." 

I am having trouble understanding if this potential is the rheobase potential or if it is the firing threshold potential defined in the source functions of the exercises. 

Thank you for any additional explanations you can provide,

Laure 

In reply to Laure Jeanne Gaëlle Vancauwenberghe

Re: v_rheobase

by Martin Louis Lucien Rémy Barry -

Hi,

this would be the rheobase potential, exactly defined as: the minimum voltage that will actuates a positive feedback (when you see the sharp increase of potential but no reset of potential). 

The firing threshold is defined as the potential at which you will reset to v_reset and is called v_spike in brian2. (Note that in the paper it is the "reset threshold ")

Indeed changing v_spike will, counter intuitively, not change your number of spikes, try to study du/dt  to understand why.

good luck ! 

The Tas