Meant to append these to the previous post: Abraham WC. Tate WP. Metaplasticity: a new vista across the field of synaptic plasticity. Progress in Neurobiology. 52(4):303-23, 1997 Abraham WC. Bear MF. Metaplasticity: the plasticity of synaptic plasticity. Trends in Neurosciences. 19(4):126-30, 1996