Does the very act of remembering undo what happened?

For a hundred years, people thought memory was wired into the brain,” Nader says. “Instead, we find it can be rewired—you can add false information to it, make it stronger, make it weaker, and possibly even make it disappear.

Neuroscientists believe that memory forms when neurons in these key brain structures are simultaneously activated by glutamate and an electrical pulse, a result of everyday sensory experience.
The experience triggers a biochemical riot, causing a specialized glutamate receptor, called NMDA, to spring open and allow calcium ions to flood the cells. The ions stimulate dozens of enzymes that reshape the cells by opening up additional receptors and by prompting the formation of more synapses and new protrusions that contain still more receptors and synapses. In aggregate, these changes make neurons more sensitive to each other and put the anatomical scaffold of a memory in place.

Enacting all these changes takes time, and for up to a few hours
the memory is like wet concrete—solidifying but not quite set, still open to interference.

Once the process is over, though, the memory is said to be “consolidated.” neuroscientists talk of memory the way geoscientists describe mountains—built through a dynamic process, but once established almost impossible to reshape quickly except by extraordinary means

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What actually happens when we recall the past? Does the very act of remembering undo what happened? Does a memory have to go through the consolidation process again?

http://discovermagazine.com/2009/jul-aug/03-how-much-of-your-memory-is-true/?searchterm=memory