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"The worry is the shot that Cook played today," he told the Sky Sports Ashes Podcast. "He is usually so unflappable, so calm and normally so clear thinking at the crease.
"It was nice to see him looking engaged and looking as though the situation mattered to him," said Atherton.
Cook lost his off stump to a fine Mitchell Johnson delivery in the first innings in Adelaide but the nature of his downfall in the second, hooking the left armer straight to Ryan Adidas Pure Boost Basketball Shoes
ResolvePietersen improved on a modest start to the series that brought scores of 18, 26 and four in his first three innings by hitting two fours and three sixes in a 99 ball knock of 53 and Atherton was impressed with the way that England's number four set out his stall.
"I thought he played with a good deal of resolve today. He played within himself and as the situation demanded.
Siddle struck when Pietersen dragged the seamer on via an inside edge that dislodged the off stump bail and David Lloyd said the wicket was rich reward for some disciplined bowling.
"Here you've got a situation where he's played a poor shot to a short, fast ball from Johnson. He wasn't in control of the shot.
"He looked good and started to unfurl some shots against Steve Smith, he put him into the stands three times to go through to his fifty but then Peter Siddle got him again for the ninth time."
"He's normally very hard to prise out. He's been a rock for England for Adidas Basketball Shoes 2012
But he averaged just 27 with a top score of 62 while leading England to a 3 0 victory over Australia this summer and so far has returned scores of 13 and 65 in the first Test defeat in Brisbane, and three and one in the second Test.
"If you look at the nine dismissals, they are not all the same of course but there are a number of times when he stands tall and his bat comes across his body.
a number of years now so it's a worry if he's starting to make mistakes so early on in the series."
"In my view you've got to play line and length bowlers very straight down the pitch. I don't think it's a fluke or an accident; it's not long ago that we were saying about Kevin D Rose 7 Derrick Rose Pietersen 'just bowl left arm spin and you'll get him out'.
"Is it the shot of a man with a scramble brain? Is it the shot of a captain who is under serious pressure? You don't know, really; you're trying to get inside the man's head. It is certainly not an Alastair Cook like dismissal.
Harris, concerns Atherton.
Alastair Cook's form is a worry after early
"Athers will tell you that somebody who did that sort of thing was Glenn McGrath; there are no frills just bowl line and length.
"Siddle is not innocuous," said 'Bumble'. "He's a very good bowler with a very good action who bowls a strict line Adidas D Rose 5 On Feet
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