Hello,

I am a PhD Student in France, and I worked on a neuron/synapse model that a Brian2 user has sent to me a few months ago and I wanted to determined the membrane voltage equations of the model I am using.

My issue is that my model looks like this :

# Set model’s morphology

```
morpho = br2.Soma(10*um)
d_l = 10*um
# Set its biophysical parameters
eqs = '''
Im = gL*(EL-v) : amp/meter**2
Is = gs1*(Es-v): amp (point current)
dgs1/dt = -gs1/taus : siemens
'''
```

Then, when i change the value of Ri in the NeuronGroup function, the voltage has a new shape. However, I didn’t use it in my equations.

I thought that my equation would be :

dydt = (1/(Cm)).(gL.(vrest - y) + (gsmax . np.exp(-t/tauS)) . (Es - y))

But Ri seems to be somewhere in this equation.

I didn’t find it in the source files, or maybe I didn’t understand them.

Can you enlighten me on this point please ?

(If my Topic doesn’t follow the rules of this website, feel free to tell me, I will adapt it)

Thanks in advance,

Guillaume