The effects of within-group and between-group methodologies in the study of perceptions of infant crying

Recent studies have indicated that various infant cry patterns can be reliably distinguished when directly compared with other infant cry patterns. The purpose of this study was to compare the effects of this within-group method of cry presentation (in which listeners are exposed to 2 types of cry patterns) with the effects of a between-group methodology (in which listeners are exposed to only 1 type of infant cry pattern). 4 groups of adult listeners rated the tape-recorded cries of low- and high-risk infants on 4 Likert-type scale items during experimental phases. In phase 1, subjects were exposed to either the cries of low-risk or high-risk infants but not both. In phase 2, subjects were exposed to both low-risk and high-risk infant cries. In phase 3, subjects were exposed to the cries they heard in phase 1. Whereas all scale items differentiated the low- and high-risk infant cries during the within-group analyses of phase 2, all scale items did not differentiate low- and high-risk infant cries during the between-group phase of the experiment. The specific pattern of results indicate that within-group methods of cry presentation accentuate the perceptual distance among cry types and may actually create many reliable differences that would not be found in between-group comparisons.     

Psychophysiological and perceptual responses to infant cries varying in pitch: comparison of adults with low and high scores on the Child Abuse Potential Inventory.

Based on their scores on the Child Abuse Potential (CAP) Inventory, 30 nonparent adults were classified as either having high CAP scores (n = 15) or low CAP scores (n = 15). Subjects' heart rate and skin conductance were assessed as they listened to audio-taped presentations of four "normal" phonated infant cries and four high-pitched, hyperphonated infant cries. Subjects also rated the cries on several perceptual items. Results showed that both groups of subjects found hyperphonated cries more aversive, distressing, urgent, arousing, and sick than phonated cry sounds. Similarly, all listeners' showed higher skin conductance levels (SCL) in response to hyperphonated than phonated cries. SCL became attenuated over time in response to phonated, but not hyperphonated, cries. Adults in the high-CAP group, showed marginally higher heart rates than low-CAP adults following presentation of all infant cry sounds and responded to phonated cries with marginally higher skin conductance levels than low-CAP adults. The responses of high-CAP nonparent adults are similar to those of parents with histories of physically abusive interactions with their infants.     

Infant Crying and Adults'' Anticipated Caregiving Responses: Acoustic and Contextual Influences

These studies assessed adults' latencies to signal that they would respond to infant crying as functions of (1) the degree of infant distress they perceived in the cry, and (2) contextual information relevant to caregiving. In the first study (N = 34), listeners waited longer to respond to cries that they had earlier rated as sounding less distressed than when they heard cries of higher distress. Further, those who had been told that the infant needed sleep waited longer to respond than those without this information. This effect of context information, however, was limited to the latencies; in another study (N = 50), listeners' ratings of distress were not affected. Several acoustic features of the cries correlated with distress ratings and with latencies to signal a caregiving response. Taken together, the results suggest that adults' responses to crying are influenced both by acoustic gradations in the cry itself and by the caregiving context. Ratings of degree of distress manifest in the cry, in other words, may be highly predictive of caregiving behavior but not wholly so. Finally, although certain acoustic variations related to greater perceived distress and speed of response, differences were apparent between infants in the magnitude of these variations. The implication that the general process of cry perception may be calibrated, or fine tuned, to the range of acoustic variation provided by individual infants is discussed.     

Associations Between First‐Time Expectant Women's Representations of Attachment and Their Physiological Reactivity to Infant Cry

Associations among 53 primiparous women's Adult Attachment Interview classifications (secure–autonomous vs. insecure–dismissing) and physiological and self‐reported responses to infant crying were explored. Heart rate, skin conductance levels, and respiratory sinus arrhythmia (RSA) were recorded continuously. In response to the cry, secure–autonomous women demonstrated RSA declines, consistent with approach‐oriented responses. Insecure–dismissing women displayed RSA and electrodermal increases, consistent with behavioral inhibition. Furthermore, insecure–dismissing women rated the cries as more aversive than secure–autonomous women. Nine months postpartum, secure–autonomous women, who prenatally manifested an approach‐oriented response to the unfamiliar cry stimulus, were observed as more sensitive when responding to their own distressed infant, whereas women classified prenatally as insecure–dismissing were observed as less sensitive with their own infants.     

Children's emotions and behaviors in response to infants' cries

Infant crying can elicit in others both a range of emotions and contrasting behavioral reactions, such as altruistic caregiving versus aggression. Variations in reactions to young infants' cries were examined in 60 children ranging in age from late preschool to preadolescence. Each child over-heard either a preterm or a full-term tape-recorded cry from an adjacent room. Then a mother, carrying her infant, came looking for her (previously) "crying" infant's bottle. Later each child was interviewed after hearing a tape recording of a preterm and a full-term cry. Children's emotions and behaviors thus were assessed in response to simulated, real distresses and hypothetical representations of distress. Children's self-reports of empathy, their verbalized intentions to help, their actual helping responses, and observers' ratings of negative emotion were common responses to cries at all ages. In addition there were significant increases with age in prosocial, behavioral interventions. Expressions of negative emotion were inversely related to subsequent forms of prosocial behavior that required direct interaction with the infant. The emotions and behaviors of most children were not influenced by whether they heard preterm or full-term cries. They were, however, able to discriminate between such cries and some articulated "theories" about the impact of the cries on the listener.     

Acoustic Characteristics of Naturally Occurring Cries of Infants with "Colic"

Although infantile colic has long been defined by a perceived excessive amount of crying, acoustic attributes of the cry sound may also contribute to perceptions that this early social behavior is excessive or problematic. From an original sample of 76 infants (38 infants referred to physicians for problematic crying, or "colic," and 38 pair-matched comparison infants), 48 infants who produced naturally occurring cry bouts both before and after an evening feeding were studied: 11 infants with Wessel's colic, 15 infants with non-Wessel's colic, and 22 comparison infants. Standard and vociferous cry segments were selected from up to 2 min of tape-recorded crying for spectrum analysis. Vociferous cry segments had a longer duration, a higher fundamental frequency, and a greater percentage of dysphonation than did standard segments. No differences between infant groups were found in cries before feeding. After feeding, infants who were problematic criers, independent of Wessel's criteria, showed a greater percentage of dysphonation in the vociferous cry segment than did comparison infants. This finding resulted from a decrease in dysphonation in the cries of comparison infants after feeding and an increase in those of infants with non-Wessel's colic. The dominant frequency also increased after feeding in the vociferous cries of infants with Wessel's colic, resulting in these infants having higher-pitched cries after feeding than infants in the other 2 groups. Results indicate that infants who are perceived to have problematic crying have objectively different acoustic features in their cry sounds that are particularly aversive, and that complaints about excessive crying cannot be accounted for simply on the basis of reporting bias in overly concerned or emotionally labile parents.     

Adult Perception of Emotion Intensity in Human Infant Cries: Effects of Infant Age and Cry Acoustics

The relation between adult perception of emotion intensity in the cries of 1- and 6-month-old infants and the acoustic characteristics of the cries was examined. In the first study, adults who were inexperienced in child care rated 40 cries on 3 emotion intensity scales: anger, fear, and distress. The cries of 6-month-olds were rated as being significantly more intense. Different acoustic variables accounted for emotion intensity ratings for the 2 infant ages. Peak amplitude and noisiness of the cry predicted adult judgments of intensity ratings of 1-month-olds' cries; a measure of amplitude ratio (in 2 frequency bands) was the best predictor of intensity ratings of 6-month-olds' cries. In the second study, parents of infants rated the same cries on the same scales. They also rated the older infants' cries as being more intense. The 2 adult groups did not differ on their ratings, and a regression equation derived from one adult group predicted the other adult group's rating of the same infant age better than it predicted its own ratings for the other infant age. Infant age, and its associated acoustic features, seems to be a more important determinant of adults' perception of emotion intensity than are such adult characteristics as gender or infant-care experience.     

Cognitive Set and Coping Strategy Affect Mothers' Sensitivity to Infant Cries: A Signal Detection Approach

We used Signal Detection methodology to examine how cognitiveset affects mothers' response to an infant cry. We asked whether a cry from a "difficult" versus an "easy" infant would elicit a change in sensitivity or response bias in mother processing of these cries. Thirty-eight mothers of 4- to 6-month-old infants participated in a Signal Detection task in which they were asked whether they could detect differences between a standard cry and 1 to 4 cry variants. Cry variants differed from the standard cry in small, systematic changes in fundamental frequency. The task was conducted in 2 parts; each part constituted a condition wherein mother received a cognitive set manipulation that labeled the identical cry as coming from either a'difficult'or an "easy" infant. An increase in mothers' sensitivity was associated with the "difficult" infant cognitive set. We examined as well how a coping strategy(illusion of control) affected cry signal processing. Mothers who Exhibited high illusory control were least -sensitive in detecting differences between cries. Two information-prcessing, measures response time and heart rate, were also collected and showed that greater sensitivity was associated with more efficient processing of the cry signal.     

Crying and infant abuse in rhesus monkeys

This study investigated the relation between crying and infant abuse in group-living rhesus monkeys (Macaca mulatta). The subjects were 10 abusive mothers with their infants and 10 control mother-infant pairs. Abused infants cried more frequently than controls in the first 12 weeks of life, even when cries immediately following abuse were excluded from the analysis. The coos of 5 abused infants differed from those of 5 controls in several acoustic parameters, whereas their screams and geckers were acoustically similar, when recorded in the same context. Abusive mothers were less likely than control mothers to respond positively to the cries of their infants. Although infant cries may increase the probability of abuse being repeated, infant crying per se does not appear to be a major determinant of abuse.     

Cross-cultural differences in maternal perceptions of cries of low- and high-risk infants

The tape-recorded cries of low- and high-risk newborn infants were rated by 150 inner-city Anglo-American, Black-American, and Cuban-American mothers during the hospital lying-in period following childbirth. Half of each cultural group was primiparous and half was multiparous. The mothers rated the cries along 4 perceptual and 6 caregiving response scale items. Reliable differences were found between low- and high-risk infant cries on all perceptual responses with the effects of culture and parental experience affecting the degree of differences. Generally, Anglo-American mothers found the cries more distressing, urgent, arousing, and sick sounding than Black-American mothers, while Cuban-American mothers showed similarities to both Black- and Anglo-American mothers depending on the scale items. The ratings on the caregiving response scale items paralleled cultural differences found on the perception scale items and previous reports of the mother-infant interaction patterns of other Anglo-, Black-, and Cuban-American samples. The results are discussed as being important in developing nonethnocentric views of the functional significance of the behaviors of the infant at risk, yet as providing evidence of the cross-cultural significance of the cry sound of the infant at risk.     

Maternal self-efficacy and infant attachment: integrating physiology, perceptions, and behavior

48 mothers of 5-month-old infants were asked to estimate their control over the termination of an infant cry in a laboratory-simulated child-care task. Mothers who greatly overestimated their control differed from low or moderate "illusion-of-control" mothers by exhibiting a depression-prone attributional style, a depressed mood state, perceiving the father as participating less in child care, and responding to impending infant cries with heart-rate acceleration characteristic of aversive conditioning. At age 16 months, 40 of the mother-infant pairs participated in the Ainsworth Strange Situation. Insecure infant attachment at 16 months was associated with maternal perception of overcontrol, depressed mood state, and aversive conditioning to the impending cry in the laboratory task at the 5-month period.     

Newborn pain cries and vagal tone: parallel changes in response to circumcision

Clinical studies have demonstrated that the cries of chronically stressed, medically compromised infants are characteristically higher and more variable in pitch than those of healthy infants. Other studies have indicated that the vagal tone of chronically stressed infants is significantly reduced in comparison to that of normal infants. A neural model of cry production has been proposed which suggests that decreased vagal tone among infants at risk may, in fact, be related to these increases in cry pitch. Using routine, unanesthetized circumcision as a model of stress, we were able to examine the relation between cry acoustics and vagal tone in normal, healthy newborns undergoing an acutely stressful event. Vocalizations, heart, and respiratory waveforms were continuously recorded from 49 (32 experimental; 17 control) 1-2-day-old, full-term infants during preoperative, surgical, and postoperative periods. Vagal tone, as measured by the amplitude of respiratory sinus arrhythmia extracted from heart period data, was significantly reduced during the severe stress of circumcision, and these reductions were paralleled by significant increases in the pitch of the infants' cries. In addition, individual differences in vagal tone measured prior to circumcision surgery were predictive of physiological and acoustic reactivity to subsequent stress. These results emphasize the potential role of vagal control of the autonomic nervous system during stress.     

What Men Do When a Baby Cries: Increasing Testosterone May Lead to Less Nurturant Care but More Environmental Vigilance

SYNOPSIS

Infants’ crying modulates parental behaviors, which in turn, ideally, lead to calming the infant. The mutually beneficial reciprocity between infants’ and parents’ behaviors is conserved across mammalian species. Although some studies highlight similarities in responses to infant cries across gender, other studies report differences in their behaviors and brain activity. Zeifman and colleagues in this Special Issue found that high levels of infant crying can trigger increases in testosterone in men, which is accompanied by less sensitive caregiving. Some interpret males’ lack of sensitive caregiving as neglectful, but these results could be considered as evolutionarily adaptive. Specifically, increases in testosterone levels from intense infant cries could lead to increased vigilance and alertness toward external stimuli, and thus allow males to be better equipped to protect their young.     

Effects of marijuana use during pregnancy on newborn cry

The effects of maternal marijuana use on the newborn cry were studied in Jamaica, where it was possible to rule out confounding factors such as the use of other substances and demographic variables that have clouded previous studies and where higher dosages may make the effects more visible. The acoustic characteristics of the cries of 20 infants of marijuana users and 20 controls were analyzed. The cries of the infants of marijuana users were shorter, had a higher percentage of dysphonation, a higher and more variable fundamental frequency, and a lower first formant than controls. There was also a dose response relation between the first formant and marijuana use. We suggest that heavy marijuana use affects the neurophysiological integrity of the infant.     

Embracing the Biological Roots of the Infant’s Cry

SYNOPSIS

Across species of mammals, the cry of a young infant has profound effects on the parent’s brain, physiology, emotions, and behavior. High levels of infant crying can trigger increases in testosterone in men, which is accompanied by less sensitive caregiving. By learning about the biological roots and essential functions of the infant’s cry, parents may be empowered to take steps to manage the stress that is inherently induced by these cries.     

Effects of infant cries on alcohol consumption in college males at risk for child abuse

This analog study examines the effect of hearing a child's cries on alcohol consumption, comprising one link in a possible association between drinking and child abuse. Thirty-two male undergraduate volunteers were preselected by age, drinking practices, and abuse potential. Subjects were assigned to either a high or low abuse potential group and were then randomly assigned to hear either an infant cry or a smoke alarm. Blood pressure was measured during each of three stimulus presentations. Following each presentation, the subject was asked to rate the stimulus on a number of different dimensions (e.g., soothing-arousing). Additionally all subjects participated in a subsequent taste-rating task as an unobtrusive measure of alcohol consumption. The results indicate that, regardless of risk group, subjects who listened to the infant cry consumed significantly more alcohol (M = 206 ml, SD = 126.43) during the taste-rating task than did those who heard only the smoke alarm (Mr = 95.68 ml, SD = 62.94) which was also rated as aversive. There was no relationship between abuse potential and alcohol consumption. Although diastolic blood pressure did not differ between groups, analysis of the infant rating scales revealed that, regardless of risk group, subjects who heard the infant cry reported feeling more aversion, arousal, and distress, than did those who heard the smoke alarm. These results lend additional support to studies depicting the infant cry as a stressful and aversive event, capable of eliciting increased drinking. Implications for arousal reduction by alcohol and a model of alcohol-induced child abuse are discussed.     

Adults'' Tolerance of Cries: An Experimental Investigation of Acoustic Features

Variations in the aversiveness of a newborn's distress cry were examined using experimental manipulation of 3 acoustic features of the cry (fundamental frequency, intonation, spectral complexity) and of the information given to subjects about the infant's health status. The subjects (N = 164 medical students) were allowed to control the sound pressure level (range: 50 dB [A]-105 dB[A]) of the different cry versions by repeatedly pressing a button (operant titration). For the nonmanipulated (original) cry version, the accepted sound pressure level decreased as fundamental frequency increased at above 610 Hz. This effect was modified by experimental manipulation of spectral complexity as well as intonation. A preference of intonated cries over monotonous cries was most pronounced between 534 and 686 Hz. Significant interactions of the information variable with the intonation and the complexity variables suggest that the listener's reaction to certain physical cry characteristics can be altered substantially by inducing different cognitive sets.     

Spousal Presence Modulates Salivary α-Amylase Responses to Infant Cry in Mothers With High Attachment Insecurity

SYNOPSIS

Objective: Infant cry, a major stressor for caregivers, is one of the leading triggers of child abuse. The present study examined the effects of spousal support, spousal presence, and the possible moderating effect of attachment insecurity on individuals’ subjective and physiological responses to infant cry. Design: Thirty-one healthy mothers (M age = 36 years) and their spouses participated in an infant crying paradigm, where mothers were tasked to listen to infant cries under three conditions: (1) alone, (2) in the same room as partner, without physical contact, and (3) in the same room as partner, with hand-holding. Attachment was determined using the Experiences in Close Relationship Questionnaire, and physiological response was ascertained from concentration of salivary α-amylase (sAA). After each cry sound, sAA level and subjective responses to infant cry were assessed. Results: Multilevel regression analyses revealed that trait attachment-anxiety moderated the effect of spousal presence on sAA. Specifically, mothers with high attachment-anxiety showed reduced sAA when their spouse was present, which indicates that spousal support is effective for mothers with high attachment-anxiety. Conclusions: Findings from this study translate to promising clinical applications for the management of parenting stress from infant cry.     

Adult perceptions of pain and hunger cries: a synchrony of arousal

180 male and female nonparent adults rated tape-recordings of the initial, middle, and final 10-sec segments of pain and hunger cries on 4 7-point Likert-type scale items describing how urgent, arousing, aversive, and sick the cry segments sounded. Multivariate analyses of variance showed that the final segment of the pain cry was perceived as less urgent, arousing, and aversive than the initial and middle segments. The hunger cry was perceived as increasingly more urgent, arousing, and aversive from the initial to the middle to the final cry segments, with the final segment receiving higher ratings than the final segment of the pain cry. The middle segment of both cries was the most sick sounding. While females were more aroused than males as the hunger cry intensified, and females were less aroused than males as the pain cry subsided, the initial segments of the pain cry were particularly potent stimuli to both males and females. These results suggest that different segments of cries resulting from the same stimulus provide different messages that communicate the presumed level of infant arousal.     

Distress Tolerance and Emotion Regulation: Promoting Maternal Well-Being Across the Transition to Parenthood

Objective. This study examined the association between newborns’ daily crying and five measures of new mothers’ emotional states. Design. One hundred seven new mothers responded via a one-time, anonymous, online survey that assessed their stress, well-being, emotion regulation, frustration, and coping skills. Mothers also reported their infant’s daily cry duration. Results. Average daily crying was related to mothers’ emotional experiences, and relations also existed among the five mental health measures. Regression models indicate the strongest predictors of frustration were infant’s average cry duration, maternal well-being, and infant’s health status at enrollment. Conclusion. Mental health professionals can support families through the normative, but often stressful, experience of their infant’s cries. However, a re-evaluation of the clinical criteria for excessive crying is needed, as the results suggest that mothers whose infants cry considerably less than the widely used Wessel’s 3-hour-per-day criterion for excessive crying experience significant negative mental health.