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Yerkes researchers show early life nurturing impacts later life relationships
September 01, 2009Prairie voles may serve as a useful model in understanding the influence of parent-offspring relationships
Researchers at the Yerkes National Primate Research Center, Emory University, have demonstrated that prairie voles may be a useful model in understanding the neurochemistry of social behavior. By influencing early social experience in prairie voles, researchers hope to gain greater insight into what aspects of early social experience drive diversity in adult social behavior. The study is currently available online in a special edition of Frontiers in Behavioral Neuroscience that is focused on the long-term impact of early life experiences.
Prairie voles are small, highly social, hamster-sized rodents that often form stable, life-long bonds between mates. In the wild, there is striking diversity in how offspring are reared. Some pups are reared by single mothers, some by both parents (with the father providing much of the same care as the mother), and some in communal family groups.
Researchers Todd Ahern, a graduate student in the Emory University Neuroscience Program, and Larry Young, PhD, professor of psychiatry and behavioral sciences at the Yerkes Research Center and Emory University School of Medicine, compared pups raised by single mothers (SM) to pups raised by both parents (BP) to determine the effects of these types of early social environments on adult social behavior.
"Our findings demonstrate that SM- and BP-reared animals experienced different levels of care during the neonatal period and that these differences significantly influenced bonding social behaviors in adulthood," says Ahern.
"These results suggest naturalistic variation in social rearing conditions can introduce diversity into adult nurturing and attachment behaviors. SM-raised pups were slower to make life-long partnerships, and they showed less interest in nurturing pups in their communal families," says Young.
Researchers also found differences in the oxytocin system. Oxytocin is best known for its roles in maternal labor and suckling, but, more recently, it has been tied to prosocial behavior, such as bonding, trust and social awareness.
"Very simply, altering their early social experience influenced adult bonding," says Ahern. Further studies will look at the altered oxytocin levels in the brain to determine how these hormonal changes affect relationships.
Emory University
Researchers Todd Ahern, a graduate student in the Emory University Neuroscience Program, and Larry Young, PhD, professor of psychiatry and behavioral sciences at the Yerkes Research Center and Emory University School of Medicine, compared pups raised by single mothers (SM) to pups raised by both parents (BP) to determine the effects of these types of early social environments on adult social behavior.
"Our findings demonstrate that SM- and BP-reared animals experienced different levels of care during the neonatal period and that these differences significantly influenced bonding social behaviors in adulthood," says Ahern.
"These results suggest naturalistic variation in social rearing conditions can introduce diversity into adult nurturing and attachment behaviors. SM-raised pups were slower to make life-long partnerships, and they showed less interest in nurturing pups in their communal families," says Young.
Researchers also found differences in the oxytocin system. Oxytocin is best known for its roles in maternal labor and suckling, but, more recently, it has been tied to prosocial behavior, such as bonding, trust and social awareness.
"Very simply, altering their early social experience influenced adult bonding," says Ahern. Further studies will look at the altered oxytocin levels in the brain to determine how these hormonal changes affect relationships.
Emory University
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