expressive writing as a therapeutic method: ew and memory

if motor activity is considered a strong element of memory, then why do we so often zone out while we are driving? i suppose we must conclude that novel motor activity (or at least fully-engaged motor activity) is key. perhaps that would equate to expressive writing (ew) being used as a treatment for traumatic event (te) reconciliation, insofar as it is used in a novel way in each session? (can't beat the cost to insurance for this type of therapy!)

but would that mean using new writing methods each time (personal narrative, detached observer, etc.) or is it enough to write from a new perspective each time, taking hold of a different element of the event at each outing? for instance: my te effected me this way, my te effected my loved ones this way, and so forth...

if my memory serves, neuronal calcium potassium pumps are engaged during learning, and the above proposed method of te treatment ties it more clearly into memory reconciliation, thus allowing the client an inherently self-referential (hofstadter) and most deeply personal method in which to heal.