title: The covariation of acoustic features of infant cries and autonomic state.
abstract: The evolution of the autonomic nervous system provides an organizing principle to interpret the adaptive significance of physiological systems in promoting social behavior and responding to social challenges. This phylogenetic shift in neural regulation of the autonomic nervous system in mammals has produced a neuroanatomically integrated social engagement system, including neural mechanisms that regulate both cardiac vagal tone and muscles involved in vocalization. Mammalian vocalizations are part of a conspecific social communication system, with several mammalian species modulating acoustic features of vocalizations to signal affective state. Prosody, defined by variations in rhythm and pitch, is a feature of mammalian vocalizations that communicate emotion and affective state. While the covariation between physiological state and the acoustic frequencies of vocalizations is neurophysiologically based, few studies have investigated the covariation between vocal prosody and autonomic state. In response to this paucity of scientific evidence, the current study explored the utility of vocal prosody as a sensitive index of autonomic activity in human infants during the Still Face challenge. Overall, significant correlations were observed between several acoustic features of the infant vocalizations and autonomic state, demonstrating an association between shorter heart period and reductions in heart period and respiratory sinus arrhythmia following the challenge with the dampening of the modulation of acoustic features (fundamental frequency, variance, 50% bandwidth, and duration) that are perceived as prosody.
authors.affiliation: Brain-Body Center, Department of Psychiatry, University of Illinois at Chicago, 1601 W. Taylor Ave., Chicago, IL 60612, USA.
authors.forename: Adam Michael
authors.initials: AM
authors.lastname: Stewart
authors.forename: Gregory F
authors.initials: GF
authors.lastname: Lewis
authors.forename: Keri J
authors.initials: KJ
authors.lastname: Heilman
authors.forename: Maria I
authors.initials: MI
authors.lastname: Davila
authors.forename: Danielle D
authors.initials: DD
authors.lastname: Coleman
authors.forename: Stephanie A
authors.initials: SA
authors.lastname: Aylward
authors.forename: Stephen W
authors.initials: SW
authors.lastname: Porges
mesh_terms: D000162:Acoustics; D001146:Arrhythmia, Sinus / Q000503:physiopathology; D001341:Autonomic Nervous System / Q000502:physiology*; D003448:Crying / Q000502:physiology*; D005145:Face; D005260:Female; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D010988:Play and Playthings; D025341:Principal Component Analysis; D012727:Sex Characteristics; D012931:Social Environment; D014831:Voice
keywords: Autonomic nervous system; Heart rate; Infant vocalizations; Polyvagal Theory; Prosody; Respiratory sinus arrhythmia
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