The Gunners fell seven points behind Spurs after losing to their rivals for the fourth time in their last seven outings in the Premier League but Wenger is still confident the red side of North London still holds sway.
"That's not the impression I got from the game today," he told Sky Sports after being quizzed on whether or not things had changed.
"We were not efficient in those decisive zones, not at the back or up front. We were not cautious enough. On the two goals we played offside in a position where we shouldn't play offside."
Gareth Bale and Aaron Lennon gave Tottenham a two-goal lead by half-time before Per Mertesacker gave Arsenal some hope but Wenger's side were unable to bridge the gap as they fell seven points behind Andre Villas-Boas' men.