def METHOD_NAME(self):
    """Connect sliced free spatial source population"""
    nodes = nest.Create("iaf_psc_alpha", positions=self.free_pos)
    nest.Connect(nodes[self.middle_node], nodes, conn_spec={"rule": "pairwise_bernoulli", "p": self.parameter})
    self._assert_histogram(nest.GetConnections().target, self.reference)