Maintenance of Plasticity: How are changes maintained?
1. Molecular switches: the state of a molecule / complex is maintained
2. bistable feedback of signaling cascades: signaling cascade turns "on"/"off" with large perturbations
3. Membrane trafficking: if located in the membrane, it will keep replenishing
4. Local protein synthesis: "tagged" spines get more protein synthesized
5. Recurrent network dynamics: cycling signals keep connections strong