The Swedish striker, who scored 18 goals in 16 Ligue 1 games before Christmas, has found the target four times in his last seven league matches.
"People get too used to him," he told L'Equipe. "Even in Italy, when he didn't score for two games, everyone was asking why.
"In Paris, I get the impression it's the same thing. Today, the team is playing better, so he stands out less. I think he's paying for his efforts earlier in the season.
"Even if he takes up a lot of the limelight, he's used to sharing it. It's easier too because David [Beckham] is no longer at the top of his game, and they're not rivals in sporting terms."
Ibrahimovic joined PSG last summer after spending two years at AC Milan.