The 22-year-old arrived at the Camp Nou from Santos last summer and scored 15 times during what was a fairly low-key first season in Spain.
The youngster was criticised in some sections for not justifying his price-tag, but the forward has been in excellent form in the new campaign, registering nine goals in nine games and linking well with Lionel Messi.
"I don't necessarily believe it's a 'new version' of me, but I feel happier and more at home this season. I think it's showing on the pitch too," he told reporters.
"When it all clicks here at Barcelona, it produces something very good. I don't really know what could have changed – possibly my understanding with the team? Regardless of that, I'm really enjoying myself at the moment."
Neymar, who is now Brazil's captain, has also hit 40 goals in 58 games for his country.