Severe stress harmful to children's brain

A study conducted by researchers at the Standford School of Medicine and Lucile Packard Hospital found that severe stress can affect children's brain development, according to U.S. researchers. Although this finding had been replicated previously with animals, this was the first study of its kind conducted with children.

Children with PTSD and high levels of cortisol (a stress hormone released by the adrenal glands) were likely to experience a decrease in the size of the hippocampus, a brain structure important in memory processing and emotion.

The children in the study were suffering from post-traumatic stress disorder, or PTSD, as a result of undergoing physical, emotional or sexual abuse, witnessing violence or experiencing lasting separation and loss. This type of developmental trauma often impairs the child's ability to reach social, emotional and academic milestones.

The researchers studied 15 children from age 7 to 13 suffering from PTSD. They measured the volume of the hippocampus at the beginning and end of the 12- to 18-month study period.
After correcting for gender and for physiological maturity, they found that kids with more severe PTSD symptoms and higher bedtime cortisol levels (another marker of stress) at the start of the study were more likely to have reductions in their hippocampal volumes at the end of the study than their less-affected, but still traumatized peers.

The researchers speculated that cognitive deficits arising from stress hormones interfere with psychiatric therapy and prolong symptoms.

Children predisposed by genetics or environment to be more anxious than their peers are also more likely to develop PTSD in response to emotional trauma, perhaps because their responses to other life experiences simply left them closer to that threshold than less-anxious children, according to the study to be published in the March issue of Pediatrics.

Math anxiety saps working memory

Worrying about how you’ll perform on a math test may actually contribute to a lower test score This worry can often sap the brain’s limited amount of working memory, a resource needed to compute difficult math problems.

This research was conducted by Mark Ashcroft, a psychologist at the University of Nevada Los Vegas. He speculated that math anxiety occupies a person’s working memory.

Ashcroft speculated while easy math tasks such as addition require only a small fraction of a person’s working memory, harder computations require much more.

Worrying about math takes up a large chunk of a person’s working memory stores as well, spelling disaster for the anxious student who is taking a high-stakes test.

Stress about how one does on tests like college entrance exams can make even good math students choke.

Although test preparation classes can help students overcome this anxiety, they are limited to students whose families can afford them.