What Consequences of Teenage Risk-taking Does Kashfia Rahman Describe?

On TED Talks Daily, Kashfia Rahman says that as the teenagers in her account became less fearful, guilty, and stressed, they lost the brain's ordinary fear and caution. Because a teenage brain is still developing, they also grew more interested in thrill-seeking. The consequences followed: they lacked self-control for logical decisions, they took greater risks, and they made more harmful choices. She does not blame the immature brain alone. Habituation, she says, can physically change a teen's brain and push risk higher still. The dangerous mix is that unfinished brain plus getting used to the risk.