The following is excerpted from an online article posted by ScienceDaily.
Adolescent chimpanzees share some of the same risk-taking behaviors as human teens, but they may be less impulsive than their human counterparts, according to new research. The study gets at age-old nature/nurture questions about why adolescents take more risks: because of environment or because of biological predispositions?
“Adolescent chimpanzees are in some sense facing the same psychological tempest that human teens are,” said lead researcher Alexandra Rosati, Ph.D., an associate professor of psychology and anthropology at the University of Michigan. “Our findings show that several key features of human adolescent psychology are also seen in our closest primate relatives.”
The researchers conducted two tests involving food rewards with 40 wild-born chimpanzees at a sanctuary in the Republic of Congo. The chimpanzees voluntarily participated in the games in order to receive food treats. The research was published online in the Journal of Experimental Psychology: General.
n the first test, adolescent and adult chimpanzees could choose between two containers in a gambling task. One container always contained peanuts, a food that chimpanzees somewhat like. The other container concealed either an unliked food — a cucumber slice — or a favorite food — a banana slice. The chimpanzees could play it safe and get the peanuts, or take a chance for some coveted banana at the risk of ending up with unappetizing cucumber.
During several rounds of the test, adolescent chimpanzees took the risky option more often than adult chimpanzees, but adolescents and adults had similar negative reactions when they received cucumber.
The second test, modeled after the famous “marshmallow test” with human children, examined delayed gratification where chimpanzees could receive one banana slice immediately or wait for one minute to receive three slices.
Both adolescent and adult chimpanzees chose the greater delayed reward at a similar rate. Human teens tend to be more impulsive than adults so they would be more likely to take the immediate reward.
Risk-taking behavior in both adolescent chimpanzees and humans appears to be deeply biologically ingrained, but increases in impulsive behavior may be specific to human teens, Rosati said.