Changing amount of neurons per ensemble in a BG and Thal channel

Semantic Pointer Architecture
1

Dear all
I am not able to change the parameters of an action_selection instance
This example doesn’t not have any effect, even if I reduce the number of neurons dramatically.
Have I to address the instance of action selection, here: action_sel?
(I have chosen the example: controlled question answering)

with spa.ActionSelection() as action_sel:    
    spa.ifmax(
        spa.dot(vision, spa.sym.STATEMENT),
        vision - spa.sym.STATEMENT >> statement,
        statement >> memory,
    )
    spa.ifmax(
        spa.dot(vision, spa.sym.QUESTION),
        vision - spa.sym.QUESTION >> question,
        ~(question) * memory >> motor,
    )
spa.BasalGanglia(action_count=2, n_neurons_per_ensemble=2)
spa.Thalamus(action_count=2, neurons_gate=2)