".... during the first postnatal week, the hippocampal glutamatergic network becomes gradually functional owing to the transformation of precursor, pure NMDA-receptor-based synaptic contacts into conducting AMPA/NMDA-receptor-type synapses.

"This functional synapse induction is ... input-specific and easily triggered experimentally by pairing presynaptic stimulation with postsynaptic depolarization. ...."