As the notice explains:
The authors regret that in the original manuscript, the article title contained the word ‘exasperates’ instead of ‘exacerbates’ and was incorrect. The correct article title is “Chronic progesterone treatment of male rats with unilateral 6-hydroxydopamine lesion of the dorsal striatum exacerbates parkinsonian symptoms.”
We’re guessing there is a copy editor or two over at Elsevier more than a little, er, exasperated about this mix-up. The paper was accepted on August 20, 2011 and made available online on August 25, 2011. It’s not clear if the correction ran online before the December 2012 issue, but if not, that’s a gap of 16 months from publication to correction of an obvious error.