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This article talks about the possible costs of code-switching. In the article, they talk about how people of color, mostly black people, are most likely to code-switch because it allows them to steer away from the negative stereotypes in-bedded in different racial groups and increases their likelihood of being hired. However, they find that code-switching can cause a professional dilemma; Suppress their cultural identity or sacrifice their job to be themselves?

This study from the University of Pennsylvania explores whether or not Asian-Americans have a certain "sound" to their speaking that distinguishes them from their White counterparts. White and Asian-American audio samples were curated for a test group to listen to in order to guess their races. On average, White and Asian-American participants in the study were around 65% accurate in their guesses, suggesting more success than random guessing. Some individual participants had accuracy as high as 85% or 90%. Some audio samples yielded guesses that were accurate upwards of 90% of the time. Asian-American participants were often more accurate in their guesses, but less able to express how they knew. White participants described the "upspeak" often used as a "lack of assertiveness." They also identified "increased pauses between words" and "jerkier speech". They also noted that Asian Americans used more "filler material" in their sentences like "um," "uh," or "like." I thought that was interesting because in Japanese, similar filler words like あのう and ええと are used. In Indonesian, we often hum as a filler, which I found to be different than typical English speakers' hums, and that I as a bilingual person have started to do when speaking English as well.

This site is very insightful as to the differences in language development in the brain between those that learn a second language in childhood and those that learn the language as adults. It explains briefly the idea of a critical period and discusses the interesting aspects that come along with learning a second language later in life. It mentions Broca's and Wernicke's area.

This article describes the result of an experiment which examined babies' neural responses to social interactions with their parents. They found the amount of brain activity had a positive correlation with their future language development and acquisition at three years old.