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