Niki Lauda believes Nico Rosberg's "brain has switched" since losing the title to Mercedes team-mate Lewis Hamilton.
Rosberg has recorded dominant victories from pole in Mexico and Brazil since Hamilton secured the 2015 championship at the U.S. Grand Prix. Toto Wolff has suggested Rosberg's frustrations with Hamilton from that race may have triggered his resurgence, which has also seen five consecutive pole positions since Japan.
Lauda thinks there has definitely been a change in Rosberg's mindset and says the German is now driving "free" of pressure.
"Unbelievable performance," Lauda remarked after Rosberg's win. "Lewis again second place. He will think about all this but very good race."
Asked what had been the secret to Rosberg's perfect weekend, he replied: "Like the last one. Suddenly his brain has switched and off he goes. These things happen to drivers and sometimes you fight with yourself and suddenly you get free in your head and off you go. He is as quick as Lewis. If everything is going well for him he can win."
Lauda does not think the turnaround has anything to do with Hamilton clinching the championship early, saying the Brit's performances behind the wheel in Mexico and Brazil prove he has lost none of his winning mentality.
"Maybe he lost the need nevertheless he is still fighting, you can see that with every lap. At the moment Nico is better."