When Samantha travels south from her hometown in Philadelphia, she often takes on a Southern accent and uses words and phrases unique to the south when speaking with others. This is an example of the

Chameleon Effect

Explanation:

The Chameleon effect is the  change of behavior depending on the environment around the person.

Since Samantha is using  words and phrases unique to the south while speaking with others, she is adapting her behavior to her surroundings and social environment.

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