The effects of maternal interaction style (intrusive/withdrawn) on the development of brain electrical activity were studied in infants of depressed and non-depressed mothers shortly after birth and again at 3-6 months of age. Infants of depressed mothers exhibited significantly greater relative right frontal EEG activation than infants of non-depressed mothers. Infants of depressed withdrawn mothers exhibited greater relative right frontal EEG activation than infants of depressed intrusive mothers. Furthermore, while infants of depressed mothers with intrusive interaction styles showed a shift towards greater relative left frontal EEG activation from birth to 3-6 months, infants of depressed mothers with withdrawn interaction styles showed a shift towards greater relative right frontal EEG activation.
Keywords
EEG asymmetry; Depression; Interaction styleMaternal depression has negative effects on infant behavior and physiology. For example, newborns of depressed mothers are more irritable, less consolable (Whiffen & Gotlib, 1989;Zuckerman, Als, Bauchner, Parker, & Cabral, 1990) and less responsive to stimulation (Abrams, Field, Scafidi, & Prodromidis, 1996). Infants of depressed mothers are also less responsive to facial expressions and show more negative and less positive affect when interacting with both their mothers (Cohn, Campbell, Matias, & Hopkins, 1990;Field, 1984) and a non-distressed adult (Field et al., 1988). In addition, infants of depressed mothers exhibit a distinct physiological profile marked by greater relative right frontal EEG activation (Dawson, Klinger, Panagiotides, Hill, & Spieker, 1992;Dawson et al., 1999;Field, Pickens, Fox, & Gonzalez, 1996;Jones, Field, Fox, Lundy, & Davalos, 1997).Asymmetries in brain electrical activity (EEG) over the frontal cortex are associated with the balance of the neural activity underlying two essential dimensions of affect regulation including behavioral approach and behavioral withdrawal (Davidson, 1996 andFox, 1994). Greater relative right frontal EEG activation is thought to reflect greater behavioral withdrawal and has been associated with responses to negative stimuli, inhibited behavior, negative affect and poor emotion regulation (Davidson, 1996 andFox, 1994). Infants also exhibit greater relative right frontal EEG activation during the expression, regulation and perception of negative/ withdrawal emotions (Davidson & Fox, 1982;Field, Pickens, Fox, Gonzalez, & Nawrocki, 1998 activation has been consistently noted in depressed adults (see Davidson, 1996 andDavidson, 2000 for reviews) and infants of depressed mothers as early as birth and Jones et al., 1998.Frontal EEG asymmetry profiles in depressed individuals have been shown to remain stable across time (Tomarken, Keener, & Neubauer, 1994; Vuga et al., 2006) and are present even when these individuals show a remission in their behavioral symptoms (Henriques & Davidson, 1990). Frontal EEG asymmetry profiles have also been shown to remain stable from 1 month to 3 months (Jones, Field, Fox, ...