Friday, October 8, 2010

The monarch butterfly's medicine kit


The journal Ecology Letters just published findings by Emory biologists that monarch butterflies use medication to cure themselves and their offspring of disease.

So what’s in a monarch’s medicine kit? Milkweed – but only a particular species. Experiments show that egg-laying monarchs that are infected with a parasite choose plants that have a medicinal benefit for their caterpillars.

“We believe that our experiments provide the best evidence to date that animals use medication,” says evolutionary biologist Jaap de Roode, who led the research.

Watch the video to learn more, and get a tour of one of the few labs in the world studying monarch butterflies.

Photo at left of a monarch laying her eggs by Jaap de Roode.


Related:
Do monarch butterflies use drugs?
What aphids can teach us about immunity

Thursday, October 7, 2010

Modern commerce vs. evolutionary psychology

Photo by Carol Clark

Emory economist Paul Rubin writes in the Wall Street Journal about how evolutionary psychology may play a role in "the protectionist instinct" when it comes to commerce:

As unemployment remains high and the election nears, many politicians are again campaigning against free trade and its cousin, outsourcing. Polls show voters are increasingly skeptical of the benefits of free trade. There is no area where the beliefs of ordinary citizens are more at odds with the views of professional economists.

Why is that? Why do so many people have difficulty understanding the benefits of international trade, while clinging to counterproductive policies that reduce consumer welfare by limiting it? An answer can be found in the writings of the Nobel Prize-winning economist Friedrich Hayek and of evolutionary psychologists.

In "The Fatal Conceit" (1988), Hayek wrote that "man's instincts . . . were not made for the kinds of surroundings, and for the numbers, in which he now lives. They were adapted to life in the small roving bands or troops in which the human race and its immediate ancestors evolved during the few million years while the biological constitution of homo sapiens was being formed." His insight anticipated the modern field of study called evolutionary psychology, which explains current belief systems as being based in part on our evolutionary history.

Read the whole column in the Wall Street Journal
. FYI: The WSJ wants you to subscribe to see the full story, which seems a bit protectionist. : )

Related:
Your money and the herd mentality
Getting a grip on cultural evolution

Wednesday, October 6, 2010

Hopes high for HIV vaccine


Less than two out of five people who need treatment for HIV in the United States are receiving it, underscoring the tremendous sociological complexities surrounding HIV/AIDS, and the importance of finding a vaccine.

The Emory Center for AIDS Research
recently served as the Atlanta host for the AIDS Vaccine 2010 conference, where scientists from around the world discussed promising research. (See video, above.)

The socioeconomic issues associated with poverty increase the risk for HIV infection and affect the health of people living with HIV. By race/ethnicity, African Americans face the most severe burden of HIV in the United States. At the end of 2007, blacks accounted for almost half of people living with a diagnosis of HIV infection, according to the CDC.

In Africa, an estimated 23 million people are HIV positive, yet only 3 million are receiving anti-retroviral treatment.

Along with efforts to find a vaccine, Africa needs cost-effective social strategies, such as Couples Voluntary Counseling and Testing (CVCT), said Emory vaccine researcher Susan Allen. “The majority of new HIV infections in Africa are acquired from a spouse, and couples are the largest HIV risk group,” she said. “CVCT is an economical, sustainable and proven model for reducing the rate of HIV/AIDS in Africa.”

For more news from AIDS Vaccine 2010, visit Emory Health Now.

Related:
Blazing a new path for development work
Health volunteers battle odds in Ethiopia

Monday, October 4, 2010

In classrooms, are pencils missing the point?


Credit: iStockphoto.com.


In her blog "Live Shots," Elizabeth Prann of Fox News
reports on how Emory is using technology to engage science students in the classroom:

Along with the required reading list, Emory chemistry lecturer Tracy Morkin requires her students to buy what looks like a television remote at the beginning of the semester. It’s called a “clicker.”

Morkin said it’s a great tool to get every student directly involved in the lecture. She posts multiple-choice questions on an overhead projector, her students then punch their answers into the device and the results are sent to Morkin's computer.

“It’s a way to engage and activate the learning even in a large lecture setting,” Morkin said about clickers. “I love the idea of getting feedback from students in real time. They tell me what they know in that moment and I can adjust my lecture accordingly.”

Preetha Ram, an associate dean for pre-health and science education at Emory says technology is quickly expanding beyond the clicker, to a global virtual study hall called OpenStudy.

Read the full story at the Fox News web site.

What do you think? Will technology ever fully replace the art of taking lecture notes using a pen or pencil?

Related:
Should chemistry class be fun?
Computer games called future of education

Thursday, September 30, 2010

How do Obama-era children view race?


"I just want children to feel comfortable in their own skin," says Bentley Gibson, who is researching self-identity and race in preschoolers. Photos by Carol Clark.

Race has been a constant theme in the life of Bentley Gibson, an Emory graduate student in psychology. She grew up in White Plains, New York. “I was one of the very few African Americans in the advanced placement classes in my school,” she recalls.

Her father, who directs an after-school program for disadvantaged children, was one of the first African Americans to graduate from a public high school in Ocilla, Georgia. He left his all-black school to integrate the white one during his senior year. “They wouldn’t let him play on the basketball team,” Gibson says. “He told me that it was obvious that they didn’t want him there, and that they thought of him as lesser, even though he was at the top of his graduating class.”

Her mother, a dermatologist, wanted her daughter to build a strong and positive self-identity. She read her stories about African-American historical figures, and when Gibson went to see Santa Claus, he was always black. “Everything in my elementary school and on TV was white, but everything at home was black, including my dolls,” Gibson says.

She went on to Atlanta’s Spelman College, a historically black college for women, and her mother’s alma mater. She was suddenly surrounded by brilliant and talented African-American women. “I spent four years learning about my own culture and history. It was life changing,” Gibson says. While grades K-12 learn about African Americans primarily in the context of slavery and the Civil War, “there is so much more to us,” she adds.

A big revelation for her was learning about the black-and-white-doll experiments conducted by African-American psychologists Mamie and Kenneth Clark, beginning in the 1940s. The landmark research found that black children aged 3 to 7 more often preferred white dolls over black ones. The majority of the black children studied also more often associated positive attributes with the white dolls, such as “good” and “pretty,” and negative attributes with the black ones.

“It saddened me to learn that young children were already so aware of how society thinks of them as inferior, simply based on the color of their skin,” Gibson says. “I started wondering what was on my mind at that age. I remembered thinking, ‘I wish my hair was straight. I really want my hair blowing in the wind.’”

Which doll is your favorite, and why?

At Emory, Gibson joined the lab of psychologist Philippe Rochat, who studies the effects of culture and environment on early child development. For her master’s thesis, Gibson designed modern-day doll experiments for the lab, using black and white versions of Barbie. Her results are showing that about 60 percent of black children aged 3 to 5 choose the white doll when asked which one is their favorite.

These results are similar whether the black children attended a mainly white preschool, or a predominantly African-American preschool that celebrates African-American culture. “I’m surprised, I thought there would be different results for children in these very different schools,” Gibson says. She had theorized that being in a predominantly black school, surrounded by positive roles models who looked like themselves, most of the children would prefer a doll that looked similar to themselves. “Even with posters of President Obama and Martin Luther King on the walls, the black children are showing a white bias,” Gibson says.

She hopes her research will raise awareness of the need to foster positive identities in black children, and to counteract the mass media imagery that celebrates certain ideals. “The vast majority of Caucasian children in previous studies preferred the white doll – they go with their own racial in-group. ” Gibson says. “But all these years later, even with a black president in office, the black kids are showing a white bias.”

Gibson has expanded the research, adding a Hispanic Barbie to the mix to study the preferences of Hispanic children, who are showing a similar white bias. The researchers are also conducting the doll experiment with children in the South Pacific.

“This research is close to my heart,” Gibson says. “I think we need to develop curriculums and other sources that combat negative stereotypes and help change the mind-set of people. I just want young children to feel comfortable in their own skin.”

Related:
Separate and unequal?
Sociologists celebrate civil rights, diversity