The 26-year-old Belgian stopper has played a big part in helping the Gunners propel themselves up the table in recent weeks, after missing two months at the start of the season through injury.
With five wins from their last six league games, and three goals contributed by Vermaelen, self-belief is spreading throughout Arsene Wenger's squad, and the defender says that the individual and collective confidence is a positive sign of things to come.
"I think it [momentum] just happens," he told Arsenal Player. "If you are winning games then you are in the mood, you are positive and your confidence just goes up. That's what's happened with this team.
"Maybe because we had a bad start some of the self-belief wasn't there as much for some players but when we started winning again it came back. That's why we're more confident on the pitch and we'll get better results.
"It's hard to say which moment or which result but I think the new players have been really important for us. They're doing a great job at the moment and they bring experience"
Vermaelen's influence in the Arsenal team is obvious, but the former Ajax star is adamant that an influx of experience, orchestrated by Arsene Wenger's moves in the summer transfer market have also helped improve the squad.
"People like Mikel have played a lot of games in the Premier League and Per has played a lot in the Bundesliga and for his country," he continued. "Both are really experienced and I'm really happy with them.
"That was good for the team I think, when they settled in well, and we've been getting better results."