Without knowing which situation the mother monkeys had experienced, the researchers rated the monkeys’ offspring according to how they responded to repeated touch with a feather, a cotton ball, and a stiff brush. They found that monkeys whose mothers had not been stressed or consumed alcohol got used to touch over time, while monkeys whose mothers had been stressed grew more disturbed by touch over time. Monkeys who had been exposed to alcohol prenatally were disturbed by touch more than monkeys who had not been exposed to alcohol prenatally.
Using a brain neuro-imaging technique known as positron emission tomography, or PET, the researchers found that the monkeys’ sensitivities to touch were related to changes in a brain chemical called dopamine in one area of the brain, the striatum. Regulating dopamine plays a crucial role in mental and physical health. Particularly important for learning, dopamine plays a major role in addictions.
“Our findings with monkeys suggest that when mothers are under stress and/or drink alcohol while pregnant, their offspring are at risk for sensory sensitivities,” notes Schneider.
Schneider called for further studies to determine whether reducing sensory sensitivities at an early age in children might help prevent the development of fetal alcohol-related behavioral problems.
“Our findings also have important implications for women of childbearing age,” she added, “suggesting that sensory sensitivities might be reduced by decreasing stress levels and abstaining from alcohol during pregnancy or if planning pregnancy.”
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The study was funded in part by the National Institute of Health’s National Institute of Alcohol Abuse and Alcoholism.
Summarized from Child Development, Vol. 79, Issue 1, Sensory Processing Disorder in a Primate Model: Evidence from a Longitudinal Study of Prenatal Alcohol and Prenatal Stress Effects by Schneider, ML, Moore, CF, Gajewski, LL, and Larson, JA (University of Wisconsin-Madison), Roberts, AD (Minnesota State University-Mankato, formerly with University of Wisconsin-Madison), and Converse, AK, and DeJesus, OT (University of Wisconsin-Madison). Copyright 2008 The Society for Research in Child Development, Inc. All rights reserved. |
