The 23-year-old was outstanding in last weekend's win over Leicester with a string of fine saves.
It was the first step towards answering questions over his the £30million is cost to sign him from relegated Bournemouth.
Arteta said: “One of the things that I was most impressed every time I watched a game he played in was his temperament.
“I wanted to watch a lot of clips and moments after he was conceding a goal, making a mistake or sort of difficult moments.
“And that's when one of the big reasons why we made the decision to sign him to play with us.
Ramsdale is already a fans favourite, joining in with fan chants and interacting with supporters at the King Power last week.
Asked whether his personality was a factor, Arteta added: “I think yes. This character was able to do that. “But at the moment we are working and it is absolutely business. At that point there's no laughs and there is no room for complacency. It's just about winning."
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