Infant's emotional variability associated to interactive stressful situation: A novel analysis approach with Sample Entropy and Lempel–Ziv Complexity

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• 作者：Rosario Montirosso ; Bruno Riccardi ; Erika Molteni ; Renato Borgatti ; Gianluigi Reni
• 关键词：Mother– ; infant interaction ; Face-to-Face Still-Face paradigm ; Sample Entropy ; Lempel– ; Ziv Complexity
• 刊名：Infant Behavior and Development
• 出版年：2010
• 出版时间：June 2010
• 年：2010
• 卷：33
• 期：3
• 页码：346-356
• 全文大小：356 K

文摘

This study examined to which extent the lack of the mother's communicative input is associated to the variability of the infant's behavioral and emotional states at a microtemporal level. Two novel non-linear signal-processing metrics were used as regularity indexes during both normal and stressful mother–infant interactions (Face-to-Face Still-Face paradigm): (1) Sample Entropy estimates the presence of epochs of similar states in a data-series, according to a moment-to-moment analysis; (2) Lempel–Ziv Complexity evaluates the occurrence and recurrence of the patterns of analogous states along the data sequence. Fourteen mothers and their healthy full-term 7-month-old infants were videotaped and the infants’ socio-emotional behaviors were micro-analytically coded off-line using a .20 s time sampling method. During the maternal still-face episodes, when infants were confronted with the perturbation of their caregiver remaining unresponsive, both regularity indexes were lower than in normal interactions. Evidence is provided that non-linear techniques are suitable to detect variability in the infant's states.