Dear Aadhar,

Unfortunately, there is no way to disable autapses with structural plasticity at the moment in NEST 3. The only work around currently available, which is only valid if you are not connecting one population with itself but only to other populations, would be to not grow the pre and post synaptic elements in the same neurons.
I have added an issue in the github repository of nest (https://github.com/nest/nest-simulator/issues/2212) to follow up on your question.

All the best,
Sandra

On 17.11.21 02:11, Aadhar Sharma wrote:

Hi all,

Is there a way to allow/disallow autapses and multapses for structurally plastic synapses in NESTv 3.1?

I used the following code for disabling autapses in NESTv2.20.1 with:

nest.SetKernelStatus({
    'structural_plasticity_synapses': {
        'syn1': {
            'model': 'copied_synapse_model',
            'post_synaptic_element': 'Den_exc',
            'pre_synaptic_element': 'Axon_exc',
        }
    },
     'autapses': False,
})

However, this does not work in NEST 3.1 (Error: "`autapses` is not a valid kernel parameter, valid parameters are: ...")

I am moving to NEST 3.1 and would like to disable autapses for structurally plastic neurons (i.e., no direct connections between synaptic elements of the same neuron).

Thanks for any help :)

Best regards,
Ady
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