Andy Robinson's men have shown glimpses of their potential in losing 51-22 to New Zealand and 21-10 to South Africa this month, but fallen short against the world's top two sides.
Following the Tonga Test at Pittodrie, Scotland will have to wait 70 days for their next international, the Six Nations opener with England at Twickenham, and Brown is determined to enter the Calcutta Cup on a winning note.
The 30-year-old Saracens back row said: "The feeling we have after this match is the feeling that we will take into the Six Nations, so we're looking to finish the autumn series on a high."
Defeat to the Springboks last weekend saw Scotland fall to 10th in the International Rugby Board world rankings, meaning they will not be part of the top eight, and therefore will be outside the main seeds when the 2015 World Cup draw is made on December 3.
Despite their pot three fate having been determined, Scotland still want to show their capabilities.
Brown said: "Every game we play we want to win. This game is exactly the same.
"The mood's really good. We've shown in the first two games that when we stick to our plan and when we do things well, we can put teams under pressure. For us it's about really nailing an 80-minute performance.
"We've shown in patches what we can do. We've not executed it through a whole match."
Robinson has made five changes in personnel to his starting line-up, with hooker Scott Lawson, lock Alastair Kellock, flanker Alasdair Strokosch, scrum-half Henry Pyrgos and centre Max Evans starting.
Out go Ross Ford, Jim Hamilton, John Barclay, Mike Blair and Nick De Luca.
The return of Strokosch, who was a late withdrawal from the Springboks clash due to a calf strain, with Barclay replacing him, means Brown will start at openside flanker.
It also means Brown will captain Scotland for a third time from a third position, this time with number seven on his back. Brown is an irrepressible force in any position and is unfazed, with his positioning the only subtle difference.
"Something I've done pretty much through the whole of my career is I've moved about, but I'm more than happy playing six, seven or eight," the former Glasgow Warriors back-row said.
"I'll fit in wherever the coaches deem I can be of best use to the team.
"I just try to play as best as I can to help the team be successful."
Kellock combines in the second row with Richie Gray, providing the latter proves his fitness after being concussed in the first half at Murrayfield last weekend.
Glasgow captain Kellock impressed as a replacement against the Springboks and was an ever present on the summer tour to Australia, Fiji and Samoa, when Hamilton was banned.
Kellock, the World Cup captain for Scotland, is looking forward to again teaming up with Gray, who moved to Sale Sharks in the summer.
The 31-year-old said: "I love playing with Richie. We have good fun, both on and off the park.
"He's an incredibly talented second row. From a line-out point of view, when I'm calling it, it's great having him there. You can win good ball on him.
"We've played together a lot over the last few years so I'm looking forward to doing it again. I think we complement each other pretty well."
Kellock was impressed by South Africa's control of the match last weekend and hopes Scotland can be similarly dominant at Pittodrie.
He added: "We've got to do that to Tonga. You look at the strengths they have and it's unstructured, counter-attacking rugby.
"We need to try to take that away from them, by being very good in defence and, in attack, playing in the right areas.
"I really feel our attack is in a very good place, but we need to show that on Saturday."
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