A Harvard dean sent a letter to the faculty on l'affaire Hauser:
An oblique sentence in his letter said that the Cognition paper had been retracted because “the data produced in the published experiments did not support the published findings.”
After seeing the relevant parts of Harvard's internal investigation into Hauser's research (and methods), this is what the editor of Cognition he had to say:
Given the published design of the experiment, my conclusion is that the control condition was fabricated.
Same difference, I suppose.