Post-traumatic shock can take various forms, from unwanted flashbacks to irritability and helplessness.
Not since 1954 had Wales won the championship after losing their opening game.
England's head coach, Stuart Lancaster, believes his side will become serious contenders to win the 2015 Rugby World Cup if they can secure their first grand slam since 2003 and prevent Wales from retaining their Six Nations crown at a hostile Millennium Stadium on Saturday.
England have been warned to concentrate on beating Italy before they even start to contemplate a potential grand slam date with Wales next week.
England believe defence will shape their Six Nations grand slam bid as the championship leaders prepare for their final two games against Italy and Wales.
Wales' inclination to name the same team for the second match in succession as they look to break their record of four successive away victories in the Six Nations is being tested by the calf injury sustained by the prop Gethin Jenkins in Italy last month and the return to fitness of the second-row Alun Wyn Jones.
Owen Farrell's strained thigh is threatening to prevent him kicking Italy to distraction next week but England's young fly-half has also been warned he must keep his competitive instincts in check if his unbeaten team are to secure a Six Nations grand slam.
The Six Nations committee has been forced into a humiliating climbdown over the three-week ban it imposed on the Ireland prop Cian Healy this month for stamping on the England front-row Dan Cole, because it breached regulations.
England have put Leicester's Toby Flood on standby to start against Italy next week amid continuing uncertainty over the fitness of the fly-half Owen Farrell.