Does it seem like teens don't pay much attention to their parents? Here are the neurological and developmental reasons why, from CornellBCTR
For the study, neuroscience researchers at Stanford University conducted functional MRI scans of youth ages 13 to 16-and-a-half. During the scans, they played recorded voices of the participants’ mothers and unfamiliar women. Both the moms and other women used the same nonsense words to ensure participants weren’t responding to the words’ meanings. The recordings were repeated in random order several times. The teens also listened to recordings of household sounds, such as vacuum cleaners.
In both studies, participants identified their mothers’ voices about 97% of the time. In younger children, MRI scans showed mom’s voice triggered a variety of areas of the brain beyond the regions responsible for hearing, including reward centers, emotion-processing regions, and visual processing areas.
Among teenagers, brain responses in all areas increased in intensity. In fact, the relationship was so strong researchers could predict a participant’s age using the voice-response data. But notably, the teens showed a stronger brain response to the unfamiliar voice, especially in areas related to rewards processing and assigning social value. This change occurred equally in boys and girls between 13 and 14 years old.
Essentially, the researchers found that teens’ brains change to help them tune into new people and put less emphasis on their parents. This change helps teenagers develop socially and form connections with people outside of their families. “The mother’s voice is the sound source that teaches young kids all about the social-emotional world and language development,” said Percy Mistry, Ph.D., co-lead author and a research scholar inand behavioral sciences. “Fetuses in utero can recognize their mother’s voice before they’re born, yet with adolescents — even though they’ve spent even more time with this sound source than babies have — their brains are turning away from it in favor of voices they’ve never even heard.
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