A first-of-its-kind study by researchers at Florida Atlantic University's Charles E. Schmidt College of Science examined the developing mother-infant relationship by studying feeding method (breastfeeding and/or bottle-feeding) and affectionate touch patterns in depressed and non-depressed mother-infant dyads as well examining the infant's electroencephalogram activity (EEG) during development. Affectionate touch was coded during the mother-infant feeding context and included stroking, massaging and caressing initiated by either mother or infant.
For the study, researchers evaluated 113 mothers and their infants and assessed maternal depressive symptoms, feeding and temperament or mood. They collected EEG patterns (asymmetry and left and right activity) from infants at 1 and 3 months old and videotaped mother-infant dyads during feeding to assess affectionate touch patterns in both mother and baby. They specifically focused on alterations in EEG activation patterns in infants across development to determine whether feeding and maternal depression are interactively related to changes in resting frontal EEG asymmetry and power.
Data from EEG activity, published in the journal Neuropsychobiology, revealed that mother-infant affectionate touch differed as a function of mood and feeding method (breastfeeding vs. bottle-feeding), affecting outcomes for infants of depressed mothers compared to non-depressed mothers. Researchers observed a reduction in infant touch toward their mothers only with the infants in the depressed and bottle-fed group. Affectionate touch of mothers and infants varied by depression interacting with feeding type, with breastfeeding having a positive effect on both maternal and infant affectionate touch. Infants of depressed and breastfeeding mothers showed neither behavioral nor brain development dysregulation previously found in infants of depressed mothers.
"We focused on mother-infant affectionate touch patterns during feeding in our study because touch is a form of mutual interaction established in early infancy, used to communicate needs, soothe, and downregulate stress responses, and because mothers and infants spend a significant amount of time feeding across the first three months postpartum," said Nancy Aaron Jones, Ph.D., lead author, an associate professor, and director of the FAU WAVES Emotion Laboratory in the Department of Psychology in the Charles E. Schmidt College of Science, and a member of the FAU Brain Institute. "As experience with maternal mood and feeding pervade the infant's early environment, we chose to examine how these factors interact to affect mother-infant affectionate touch, focusing fastidiously on the key roles of individual variation in temperament and EEG activation patterns."
Asymmetry patterns in certain infant populations, such as those of depressed mothers differ from the asymmetry patterns of typically developing infants and children. While EEG asymmetry measures the balance of the right and left hemisphere activity, infants of depressed mothers exhibit patterns of right frontal asymmetry, due in part to hypoactivation of the left hemisphere within the frontal region. This pattern of brain activation (greater right asymmetry) is similar to the pattern observed in depressed adults and is thought to represent heightened negative affect as well as motor tendencies for withdrawal and inhibited approach behaviors.
In addition to the tactile behavior changes, the infants in this study displayed differential brain activation patterns as a function of maternal depression and feeding group status. Not only were the infants' EEG patterns affected by their mother's depression status, stable breastfeeding experience also interacted with the depression group to impact EEG patterns across early development. Left frontal asymmetry in infants was associated with having a non-depressed mother and infant care experiences in the form of stable breastfeeding. Left frontal activity has been associated with advancing maturation, positive emotions, as well as higher order processing skills. Notably, EEG patterns of infants of depressed mothers showed right frontal asymmetry; however, shifts to greater left frontal activation (left frontal hyperactivation change) were found in those infants with stable breastfeeding experiences.
Analysis from the study also revealed that infant breastfeeding duration and positive temperamental characteristics predicted infant affectionate touch patterns, suggesting that early infant experiences, and more broadly, their underlying neurochemical regulatory processes during feeding could influence the development of infant physiology and behavior, even for infants of depressed mothers.
"Ultimately, our study provides evidence that the sensitive caretaking that occurs, even for mothers with postnatal depression in the context of more predominant breastfeeding, may redirect neurophysiological, temperamental, and socio-emotional risk through dyadic tactile experiences across early development," said Aaron Jones.
INFORMATION:
Study co-authors are Jillian S. Hardin, a senior researcher; Krystal D. Mize, Ph.D., affiliate faculty; and Melannie Platt, a former Ph.D. student, all within the FAU WAVES Emotion Laboratory.
This research was funded by a grant from the National Institute of Mental Health, National Institutes of Health (#MH61888) awarded to Aaron Jones.
The FAU WAVES Emotion Laboratory is focused on understanding the factors that contribute to the development of socio-emotional wellness during infancy and childhood. Funded in part by the National Institute of Mental Health of the National Institutes of Health, research in the laboratory is designed to explore and understand the contributors to optimal infant and child development.
About Florida Atlantic University:
Florida Atlantic University, established in 1961, officially opened its doors in 1964 as the fifth public university in Florida. Today, the University, with an annual economic impact of $6.3 billion, serves more than 30,000 undergraduate and graduate students at sites throughout its six-county service region in southeast Florida. FAU's world-class teaching and research faculty serves students through 10 colleges: the Dorothy F. Schmidt College of Arts and Letters, the College of Business, the College for Design and Social Inquiry, the College of Education, the College of Engineering and Computer Science, the Graduate College, the Harriet L. Wilkes Honors College, the Charles E. Schmidt College of Medicine, the Christine E. Lynn College of Nursing and the Charles E. Schmidt College of Science. FAU is ranked as a High Research Activity institution by the Carnegie Foundation for the Advancement of Teaching. The University is placing special focus on the rapid development of critical areas that form the basis of its strategic plan: Healthy aging, biotech, coastal and marine issues, neuroscience, regenerative medicine, informatics, lifespan and the environment. These areas provide opportunities for faculty and students to build upon FAU's existing strengths in research and scholarship. For more information, visit fau.edu.
