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PubMed1984

Maternal responsivity in interactions with handicapped infants.

The present study investigated the influence of 3 infant characteristics on mothers' interactions with their handicapped young children. These 3 characteristics are chronological age, mental age, and handicapping condition. Maternal responsivity was hypothesized to increase with mental and chronological age and to be more closely linked to mental than chronological age. In addition, it was expected that handicapped group membership would be related to maternal behavior, but that many of these effects would be accounted for by mental age. 111 handicapped young children and their mothers were observed in a 15-min free-play session. The children ranged in age from 3 to 36 months of age and were classified as Down's syndrome (N = 56), developmentally delayed (N = 21), or cerebral palsied (N = 34). Maternal responsivity to their infants' behavior was explored for total behavior and for proximal and distal behaviors separately using proportion scores to control for overall levels of infant and maternal behavior exhibited. Infants but not mothers emitted more behavior in the free-play setting as the infants' mental and chronological age increased. As expected, mothers were more responsive proportionately to their infants' behavior as their children became more mature mentally and chronologically older, even after controlling for age-related increases in infant behavior. Since mental and chronological age were related, partial correlational analyses were performed. The age-related increases in maternal responsivity were accounted for by mental but not chronological age. Differences as a function of handicapped group membership also were found. Cerebral palsied infants exhibited less behavior than did the Down's syndrome and developmentally delayed infants. Mothers of developmentally delayed infants exhibited more responsive behavior proportionately than did mothers of the other 2 groups. However, this difference was due to the higher mental age of the infants.

Cerebral Palsy↗

PubMed1994

Cocaine exposure prebreeding to weaning: maternal and offspring effects.

In a model emphasizing prebreeding cocaine administration, rats exposed to cocaine (50 mg/kg) daily were compared to saline-injected and noninjected controls with respect to weight changes, food and water intake, maternal behavior, offspring weight, and activity. During the first 21 days cocaine-treated dams lost weight, while the control dams gained. Throughout gestation and the first 14 days of lactation all groups gained weight, but the cocaine-exposed dams never completely recovered from the initial anorectic effect. Except during the first week of exposure, cocaine dams ate and drank more than the normal controls and drank more than the saline group. During gestation there was no difference in food intake, although the cocaine dams continued to drink more than controls. During lactation there were no differences in food and water consumption across groups. However, the cocaine dams exhibited more nursing behavior. From birth to day 21, the offspring of cocaine-treated dams were smaller than those of either control group. By 51 days of age, group differences had disappeared. Cocaine-exposed pups and saline offspring tested at days 28 and 85 were more active than those of noninjected controls. The results indicate that administration of cocaine for a period prior to breeding and during gestation and lactation, a protocol which closely resembles human drug abuse patterns, is more devastating than the administration during gestation.

Aging↗

PubMed1993

Communal reproductive success in rats (Rattus norvegicus): effects of group composition and prior social experience.

We compared the reproductive success and maternal behavior of sibling pairs of female Long-Evans rats (Rattus norvegicus) housed together from birth (familiar) to that of pairs of unrelated females housed apart during development (unfamiliar). Sires either remained in the colonies through weaning of their pups or were removed before parturition. Familiar animals reared more pups to weaning, were more likely to share in caring for their pups, and were less likely to exhibit infanticide than were unfamiliar ones. The presence of males in cages with pups had no direct effect on the reproductive success of females, but female pairs housed with males spent less time than female pairs housed alone caring for pups together in a combined nest. Conflicting evidence for communal rearing in populations of wild rats may reflect differences in the genetic relatedness or early social experience of female rats.

Animals↗

PubMed2004

Enriched environment and acceleration of visual system development.

Rearing mice from birth in an enriched environment leads to a conspicuous acceleration of visual system development appreciable at behavioral, electrophysiological and molecular level. Little is known about the possible mechanisms of action through which enriched environment affects visual system development. It has been suggested that differences in maternal behavior between enriched and non-enriched conditions could contribute to the earliest effects of enriched environment on visual development and that neurotrophins, BDNF in particular, might be involved. Here, we examined Brain Derived Neurotrophic Factor (BDNF) levels in the visual cortex during development and showed that an increase occurs in the first week of life in enriched pups compared to standard reared pups; BDNF levels at birth were equal in the two groups. This suggests a postnatal rather than a prenatal effect of environment on BDNF. A detailed analysis of maternal care behavior showed that pups raised in a condition of social and physical enrichment experienced higher levels of licking behavior and physical contact compared to standard reared pups and that enhanced levels of licking were also provided to pups in an enriched environment where no adult females other than the mother were present. Thus, different levels of maternal care in different environmental conditions could act as indirect mediator for the earliest effects of enrichment on visual system development. Some of the effects of different levels of maternal care on the offspring behavior are long lasting. We measured the visual acuity of differentially reared mice at the end of the period of visual acuity development (postnatal day 45) and at 12 months of age, using a behavioral discrimination task. We found better learning abilities and higher visual acuity in enriched compared to standard reared mice at both ages.

Aging↗

PubMed1994

Maternal child-rearing behavior in three groups: cystic fibrosis, insulin-dependent diabetes mellitus, and healthy children.

Compared child-rearing behaviors among mothers of children (ages 4-14) with cystic fibrosis (CF) (N = 26), insulin-dependent diabetes mellitus (IDDM) (N = 26), and mothers of physically healthy children (N = 26), on six domains, including involvement, limit setting, responsiveness, reasoning and guidance, free expression, and intimacy using the Iowa Parent Behavior Inventory. Maternal Reports of their child-rearing behavior were comparable across the three groups with one exception: Mothers of children with chronic illnesses (CF and IDDM) were significantly less likely to set limits than mothers of healthy children. The present findings are consistent with those of other studies that have identified few differences in child-rearing practices between mothers of children with chronic illnesses and mothers of healthy children. Future research should identify situation-specific parenting tasks unique to childhood chronic illness.

Adolescent↗

PubMed1996

Maternal education and maternal responsiveness as predictors of play competence in low birth weight, premature infants: a preliminary report.

Videotaped play interactions of 182 low birth weight, premature toddlers and their mothers were used to investigate whether a model including maternal responsiveness together with level of maternal education was a better predictor of play maturity scores of the children than a model consisting of education level alone. The videotapes were coded using the responsiveness subscale of the Maternal Behavior Rating Scale. Regression analyses revealed that maternal education alone significantly predicted play scores, accounting for 9% of the variance. However, the model that included both maternal responsiveness and maternal education together also significantly predicted play scores and accounted for 20% of the variance. Including responsiveness together with maternal education significantly increased the proportion of variance accounted for by maternal education alone. Implications of these findings are discussed.

Child Behavior↗

PubMed1990

Oxytocin inhibits infanticide in female house mice (Mus domesticus).

Between 60 and 90% of female house mice spontaneously kill unrelated young. A previous report indicated that subcutaneous administration of oxytocin significantly reduced the frequency of infanticide by virgin and pregnant females. However, in this study a distinction could not be made between an action of oxytocin on the CNS versus a secondary effect such as an enhanced release of prolactin by oxytocin. In the current experiment, oxytocin administered intracerebroventricularly was equally as effective at inhibiting infanticide as sc oxytocin. There was no difference in the effectiveness of oxytocin between groups of infanticidal females that were gonadally intact, ovariectomized, or estrogen treated. Pretreatment of infanticidal females with the prolactin inhibitors, bromocriptine and cysteamine, was also without effect on the ability of oxytocin to inhibit infanticide. Last, prolactin-inhibiting drugs had no significant effect on spontaneous parenting behavior by female mice. These data suggest that oxytocin acts directly on the CNS to alter behavior toward pups and that prolactin may not play a role in the maternal behavior of the house mouse.

Animals↗

PubMedDate not supplied

The evaluation of maternal competency.

There is limited discussion of maternal competency in the consultation-liaison psychiatry literature. As awareness and reporting of child abuse is increasing, maternal ability to care for newborns is more often called into question. Maternal risk factors for harm and neglect have been identified, and positive signs of maternal ability have also been recognized as important to appraise. Specific domains in the maternal competency exam should be assessed by the psychiatrist, nursing staff, social work staff and pediatrician. The competency exam by the psychiatrist requires a sensitive and nonjudgmental inquiry into maternal behavior and thoughts. The authors present a case study of an inpatient maternal competency consultation that illustrates some of the dilemmas encountered. Future directions should include more involvement by psychiatrists in preventive efforts and interventions that focus on pregnant women at risk in prenatal clinics and in the community.

Adult↗

PubMed1995

Estrogen modulation of oxytocin and its relation to behavior.

Establishment of the behavioral significance of oxytocin neurotransmission in the brain has been a leading component in the emerging concept of neuropeptide regulation of behavior. Elucidating the behavioral effects of oxytocin has been facilitated by its profound regulation by estrogen in discrete brain areas and its subsequent role in estrogen-dependent responses. For example, female sexual behavior is estrogen dependent, estrogen markedly increases oxytocin binding in the ventromedial nucleus of the hypothalamus and infusion of oxytocin in this brain area increases female sexual behavior. A similar correlation exists for the role of oxytocin and estrogen in the regulation of maternal behavior. A possible underlying cause of these behavioral effects is that by acting as an anxiolytic, oxytocin reduces the inhibition inherent in social encounters. Behavioral tests in the laboratory frequently involve the exposure of the animal to a novel environment, such as a pup-retrieval apparatus or mating arena, combined with exposure to an unfamiliar conspecific. These stimuli are likely to induce a stress response and perhaps this anxiety is reduced by oxytocin. Recent evidence in mice suggests that oxytocin has anxiolytic properties in estrogen-treated females (McCarthy and Goldman, 1994) and supports the hypothesis that a unifying principal in oxytocin action in the brain is to facilitate social encounters by reducing the associated anxiety.

Animals↗

PubMed1982

Genetic association between progesterone-induced and maternal nesting in mice.

Increases in nesting during pregnancy may be mediated by progesterone in mice. If the behaviors, maternal nesting (MN) and nesting induced by exogenous progesterone (PN), are controlled by the same physiological mechanism, it would be expected that they share a common genetic basis. The present experiment was designed to quantify the extent of genetic association between PN and MN. At Wesleyan University, baseline nesting was measured on females of 4 inbred strains. Subsequently, half of the mice in each strain received progesterone implants. There were significant increases in nesting due to progesterone treatment. After 21 days, implants were removed and nesting levels returned to baseline. The mice were mated and nesting measured throughout pregnancy. The strain rank order was the same for levels of PN and MN. The genetic correlation between PN and MN estimated from analysis of covariance within and between strains was not significantly different from 1.0. These results were replicated at the University of Iowa. The high genetic correlation implies a common physiological mechanism underlying PN and MN.

Animals↗

PubMedDate not supplied

Factors contributing to preterm infant engagement during bottle-feeding.

BACKGROUND: Preterm infants have difficulty maintaining engagement throughout early oral feedings, which can lead to less efficient feeding and prolonged feeding skill development. OBJECTIVE: To examine contributions of the infant, mother, and feeding context to infant engagement during bottle-feeding. METHODS: Bottle-feedings of very-low-birthweight infants (n = 22) by their mothers were observed. Infant and maternal behaviors were coded and synchronized with physiologic measures. At completion of the feeding, the mothers were interviewed, and their working model of feeding coregulation was scored. Feedings were subdivided into feeding episodes (n = 114). Using multilevel linear regression analyses, four dyadic characteristics (working model of the caregiver's role as coregulator, birthweight, postconceptional age, baseline oxygen saturation) and five episode characteristics (readiness at episode onset, episode baseline oxygen saturation, mean oxygen saturation during the episode, maternal feeding behavior, and phase of feeding) were examined as potential predictors of feeding episode engagement. RESULTS: Conditions observed during the feeding observation explained most of the variation in engagement. Engagement was more likely to occur during the early phase of feeding (p <.05), during feeding episodes that began with infant readiness (p <.05), and during feeding episodes with higher mean oxygen saturation during the episode (p <.05). Feeding episodes with less jiggling of the nipple had a significantly greater amount of engagement (p <.05). CONCLUSIONS: The ability of the preterm infant to maintain engagement during bottle-feeding cannot be explained by characteristics of the infant or by the prefeeding condition of the infant alone. Rather, engagement is coregulated by the caregiver and the infant throughout the feeding. Strategies to assist infants in maintaining physiologic stability during bottle-feeding and further study of effective and contingent caregiver feeding behaviors are needed.

Adult↗

PubMedDate not supplied

A review of nursing interventions to foster becoming a mother.

OBJECTIVE: To determine the current state of knowledge of nursing interventions that foster the process of becoming a mother. DATA SOURCES: A literature search was conducted using CINAHL and PubMed electronic databases and other key references. STUDY SELECTION: Reports on nursing intervention research published in English that focused on a facet of maternal behavior in the process of becoming a mother during pregnancy or during the first 4 months following birth, or both, were included. Twenty eight reports were found. DATA EXTRACTION: Studies were reviewed, categorized, and analyzed and interventions synthesized to determine the current knowledge base for fostering becoming a mother. Categories included instructions for infant caregiving, building awareness of and responsiveness to infant interactive capabilities, promoting maternal-infant attachment, maternal/social role preparation, and interactive therapeutic nurse-client relationships. DATA SYNTHESIS: Interactive therapeutic nurse-client relationships and maternal/social role preparation had greater impact on variables indicating progress in becoming a mother than formal teaching. Instructions without nurse input were ineffective. CONCLUSIONS: Interactive reciprocal nursing interventions are the most effective in enhancing mother-infant interactions and maternal knowledge about infant care. Evidence is limited on how to foster the mother's feelings about herself in becoming a mother and attachment to her infant.

Attitude to Health↗

PubMed2006

Running in pregnancy transiently increases postnatal hippocampal neurogenesis in the offspring.

Voluntary wheel running of mice in pregnancy and lactation led to a twofold increase in hippocampal precursor-cell proliferation and in the number of Prox1-expressing lineage-determined cells at postnatal day 8 (P8). At P36, the number of newly generated granule cells approximately doubled, resulting in a 40% higher total number of granule cells in pups from running dams as compared with controls. Cell proliferation at embryonic day 15 (E15), in contrast, was decreased in the progeny of exercising mice, and the birth weight was reduced. At P49, body weight had normalized, and hippocampal neurogenesis was not different between the two groups. mRNA for FGF2 was expressed at higher levels at E15 and P8 in runner pups, whereas VEGF was increased only at E15. Insulin-like growth factor did not show differences at any time point. At P36, no differences for any of the factors were found. Our data indicate that maternal behavior and physical activity affects infantile growth-factor expression and can transiently stimulate postnatal hippocampal development in the offspring.

Animals↗

PubMed1990

Endocrine responses to mother-infant separation in developing rats.

Separation of neonatal rat pups from the dam have been reported to elicit two endocrine responses in the pup: a fall in growth hormone secretion and a rise in corticosterone secretion. However, the temporal, ontogenetic, and behavioral determinants of these responses have not been compared. In the present study, we report that these two responses can be differentiated on each of these criteria. Growth hormone secretion falls rapidly immediately upon separation of pups from the dam, while robust rises in corticosterone secretion are delayed for many hours. In addition, growth hormone responses are observed earlier in ontogeny. Finally, active maternal behavior is required for normal growth hormone secretion in 10-day-old rat pups, while passive sensory stimuli associated with the dam can significantly reduce the corticosterone response to separation.

Animals↗

PubMed1997

Behavioral consequences of abnormal cortical development: insights into developmental disabilities.

Cerebral cortical development occurs in precisely-timed stages that can be divided into neurogenesis, neuronal migration and neuronal differentiation. These events occur during discrete time windows that span the late prenatal and early postnatal periods in both rodents and primates, including humans. Insults at particular developmental stages can lead to distinctive cortical abnormalities including cortical hypoplasia (reduced cell number), cortical ectopias (abnormalities in migration) and cortical dysplasias (abnormalities in the shapes or numbers of dendrites). In this review, we examine some of the most extensively-studied animal models of disrupted stages of cortical development and we compare long-term anatomical, neurochemical, and behavior abnormalities in these models. The behavioral abnormalities in these models range from alterations in simple motor behaviors to food hoarding and maternal behaviors as well as cognitive behaviors. Although we examine concisely animal models of cortical hypoplasia and cortical ectopias, we focus here on developmental manipulations that affect cortical differentiation, particularly, those that interrupt the normal ontogeny of the neurotransmitter-defined cortical afferent systems: norepinephrine, serotonin, dopamine and acetylcholine. All of these afferents presumably play a critical role in the maturation of their cortical targets; the timing of the afferents' entry into the cortex and their effects on their cortical targets, however, are different. We, therefore, compare the specific anatomical, neurochemical and behavioral effects of manipulations of the different cortical afferents. Because of the considerable evidence that cortical development proceeds differently in the two sexes, when data are available, we address whether perinatal insults differentially affect the sexes. Finally, we discuss how these developmental studies provide insights into cellular and neurochemical correlates of behavioral functional abnormalities and the relevance of these data to understanding developmental disabilities in humans.

Animals↗

PubMedDate not supplied

Low level lead exposure during lactation increases rough and tumble play fighting of juvenile rats.

Lactating rats were given distilled water or distilled water containing 0.067% lead chloride (500 ppm lead) as their sole source of drinking fluid from Days 1-21 of lactation. Activity, social investigation and rough and tumble play fighting behaviors of the offspring were observed on Day 26 and activity and play solicitation behaviors on Day 36. Although lead treatment reduced the mothers' fluid intake, there were no effects on pup growth and activity or on maternal behaviors. When paired with a group-housed stimulus animal on Day 26, lead-treated subjects had increases in the two measures of play fighting (crossover and pinning), and in social investigation, relative to controls. When tested with a scopolamine-treated, non-playful stimulus on Day 36, increased crossover frequencies were observed in lead-treated subjects when compared with controls. Two-min activity levels on Days 26 and 35 were unaffected by lead exposure. These results indicate that social interactive behaviors of juvenile rats are effective tools in the assessment of exposure to toxic substances early in development.

Aggression↗

PubMedDate not supplied

Prenatal nicotine exposure increased susceptibility to electroconvulsive shock (ECS) in adult rats.

Female rats were treated during pregnancy (days 1-20) with nicotine (1 mg/kg SC, b.i.d.). When some aspects of maternal behavior and developmental parameters were recorded in mothers and pups, respectively, no changes were detected in the experimental group as compared with controls. However, adult offspring of nicotine-treated rats showed an increased susceptibility to ECS. These results demonstrate long-lasting deleterious effects induced by nicotine exposure during fetal life.

Animals↗

PubMedDate not supplied

Child behavior problems and maternal symptoms of depression: a mediational model.

PROBLEM: The relationship between maternal depression and child behavior problems has been consistently demonstrated, but not the impact of child behavior problems on maternal depression. METHODS: Mothers of 3- to 6-year-old children (N=69) reported regarding their depression, parenting competence, attachment to the child, the child's impact on the family, and behavior problems. FINDINGS: Child behavior problems were positively associated with maternal depression, an association explained by mediating variables: impact of the child on the family, mother's parenting competence, and attachment to the child. CONCLUSIONS: Maternal depression should be considered when providing clinical services to children, given the potential for exacerbation of symptoms in the face of child behavior problems.

Adult↗