"listeners sometimes assume that people who speak with an accent different than their own are less intelligent than people who speak without a noticeable accent."

I believe the answer is: True

People who speak without a noticeable accent tend to be able to do it by practising it over and over again through self study and direct communication with a lot of people. Because of this, they tend to be really good at interacting with other people and perceived as more intelligent.

You can do