A team of Carnegie Mellon University computer scientists and cognitive neuroscientists have found a way to identify where people's thoughts and perceptions of familiar objects originate in the brain by identifying the patterns of brain activity associated with the objects. Hear more in this Discovery Files podcast.
Audio Credit: NSF/Clear Channel Communications/Karson Productions
After studying thousands of children, psychologist Mona El-Sheikh, a professor of child development, says children who don't get enough sleep suffer serious consequences. "They do not concentrate as well or perform well on tasks that are complex," she said. See more in this Science Nation video.
Credit: Science Nation, National Science Foundation
The Division of Behavioral and Cognitive Sciences (BCS) of the Directorate for Social, Behavioral and Economic Sciences supports research to develop and advance scientific knowledge on human cognition, language, social behavior and culture, as well as research on the interactions between human societies and the physical environment.
A study that combined brain scanning, eye-tracking and behavioral measures to understand brain responses found that moral responses change as people age. Moral judgments become more tempered as the brain becomes better equipped to make reasoned judgments and integrate an understanding of the mental states of others, the researchers said.
Digital imagery, Facebook updates, online music collections, email threads and other immaterial artifacts of today's online world may be as precious to teenagers as a favorite book that a parent once read to them or a t-shirt worn at a music festival.
A cold dose of fear lends an edge to the here-and-now--say, when things go bump in the night. It makes us more sensitive to our external surroundings as a way of learning where or what a threat may be, but interferes with our ability to do more complex thinking.
June 20, 2011
Teens and Stress
Decisions and stress and adolescents, oh my!
Stressing out about a boyfriend or girlfriend or history test is part of a typical day for a teenager. But what is making these insignificant events seem like the end of the world?
With help from the National Science Foundation (NSF), Adriana Galván, a psychologist at the University of California, Los Angeles (UCLA), has been studying the effects of stress on teenagers and adults.
"Teenagers experience stress as more stressful," says Galván, "and if that stress is interfering with their decision making, it's really important to understand the neural mechanism that's underlying this connection between high levels of stress and poor decision making."
Galván's ground-breaking study focuses on the effect stress has on brain function. Study participants report their stress level daily, using a one to seven scale--seven being the worst. If participants rate their day as a seven, Galván will ask them to visit the lab for tests.
Nilufer Rustomji, an 18-year-old participant of the study, rates her day's stress level as a seven. Monitoring her brain function with Magnetic Resonance Imaging (MRI), Galván asks Rustomji to play a simple "reward and risk" video game, which involves wagering money.
"During the game, Rustomji is evaluating risk," explains Galván, "and while she's doing that evaluation, we are taking pictures of the brain to see how the brain makes [such] risky choices."
After computer processing the images, Galván analyzes how stress and risk influence what she calls the "reward system."
"The teenagers show more activation in the reward system than adults when making risky choices, and they are also making more risky choices than adults are," says Galván.
The prefrontal cortex is the part of the brain that helps regulate behavior but in adolescents, this region is not fully developed.
To help lower teens' stress, Galván says teens should double check and think about how the consequences will affect them later. "When you are stressed out as a teenager, it's interfering with your ability to make decisions," says Galván. "It's interfering with how the brain functions in regions that are still developing, mainly the reward system and the prefrontal cortex."
Galván's study is helping to provide deeper insight into why teenagers often act the way they do.
Any opinions, findings, conclusions or recommendations presented in this material are only those of the presenter grantee/researcher, author, or agency employee; and do not necessarily reflect the views of the National Science Foundation.