The Ivory Coast international was sarcastically cheered by Gunners fans when he was taken off during Wednesday's Champions League defeat following a disappointing display up front.
"I am working very hard at training to improve my efficiency, to be more clinical in front of goal," the 25-year-old told the club's official website. "It has been my flaw so far.
"I know I still have a lot more to learn but I am more confident now - the start of the season and my goals so far have showed that I have improved a lot."
Gervinho is Arsenal's top scorer in all competitions so far this season with five goals.