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At least 343 records · Page 19Linked to original sources
PubMed1990

Long-term effects of preoptic area knife cuts on the maternal behavior of postpartum rats.

Knife cuts severing the lateral connections of the medial preoptic area disrupt maternal behavior in postpartum rats. In these studies the knife cuts were produced 1-2 days prior to behavioral testing. The present study examined whether preoptic area knife cuts produce long-term deficits in maternal behavior. Nulliparous Charles River CD rats received knife cuts severing the lateral connections of the medial preoptic area or sham cuts. Approximately 2 weeks later they were mated. All females delivered young 22-23 days after mating, and litter size did not differ between the groups. Females with preoptic knife cuts cleaned their young, built nests (albeit of inferior quality), crouched over their young in a nursing posture, and lactated. The major deficit shown was the near total elimination of retrieval behavior. Females with preoptic knife cuts, however, were capable of performing the oral-motor responses associated with hoarding behavior. These results show that severing the lateral connections of the medial preoptic area does produce long-term deficits in maternal behavior, particularly with respect to maternal retrieving.

Animals↗
PubMed2006

Early social isolation alters behavioral and physiological responses to an endotoxin challenge in piglets.

Psychosocial stress in the form of maternal deprivation and social isolation during early postnatal life induces persistent alterations in behavioral and physiological mechanisms of adaptation. One consequence may be an increased susceptibility to diseases in later life. Therefore, the aim of the present study was to investigate in domestic piglets the effects of a repeated social isolation (2 h daily from day 3 to day 11 of age) on behavioral, endocrine and immune responses to an endotoxin challenge with lipopolysaccharide (LPS) 1 day or 45 days after the isolation period. Peripheral LPS administration caused serious sickness behavior (somnolence, shivering, vomiting) and provoked profound increases in circulating tumor necrosis factor-alpha (TNF-alpha), ACTH and cortisol concentrations. The prior social isolation treatment enhanced signs of sickness and impaired suckling behavior. Early isolated piglets responded to LPS by an increase of shivering on day 12 and by increased vomiting on day 56 compared to controls. Further, there were considerable delays and reductions of time isolated piglets spent suckling on day 12. The repeated isolation stressor diminished TNF-alpha increases after LPS, whereas stress hormone levels were not significantly affected by isolation treatment. Finally, stronger relationships between signs of sickness and physiological measures were revealed in early isolated piglets. The duration of somnolence in isolated piglets was related to changes of cortisol and TNF-alpha concentrations, and the highest impact on duration of shivering was found for changes in cortisol and corticosteroid binding globulin levels. The present results suggest a sustained adaptive sensitization of coping with infection by social stress experience during early development in piglets.

Adrenocorticotropic Hormone↗
PubMed2005

Pavlovian conditioning: a functional perspective.

From a functional perspective, Pavlovian conditioning involves learning about conditioned stimuli (CSs) that have a pre-existing relation to an unconditioned stimulus (US) rather than learning about arbitrary or neutral CSs. In addition, the most important product of learning involves changes in how the organism responds to the US, not in how it responds to the CS, because the US is the more biologically relevant stimulus. These concepts are illustrated using examples from a variety of behavioral and physiological situations including caloric intake and digestion, breast feeding, poison-avoidance learning, eyeblink conditioning, sexual conditioning, fear conditioning, aggression, and drug tolerance and sensitization.

Adaptation, Psychological↗
PubMed2001

An observational study of object mouthing behavior by young children.

OBJECTIVE: Mouthing behavior in infants and young children <3 years old is a poorly quantified yet normal part of early childhood development. Increasingly, safety and risk assessments involving materials that may be mouthed depend on accurate estimates of oral contact time. This study reports the results of an observational study performed to investigate and obtain data on mouthing behavior of objects for children up to 3 years old. METHODOLOGY: The study used a standard diary form with instructions for participating parents to observe their child in a normal environment (primarily home), and to document both the type and duration of each item mouthed. Phase I (pilot) consisted of 30 children each observed for 1 day, divided equally between the ages of 0 to 18 months (n = 15) and 19 to 36 months (n = 15), whereas Phase II included more participants (n = 92 aged 0-18 months; n = 95 aged 19-36 months). Phase III included observations for 5 nonconsecutive days over a 2-month period on 168 children between the ages of 3 to 18 months (at study initiation), and focused on total mouthing time of objects, exclusive of pacifiers. RESULTS: The data collected during the first 2 phases were pooled and analyzed together. For all participants between the ages of 0 and 18 months (n = 107), the average daily duration of mouthing objects included: pacifiers (108 minutes), plastic toys (17 minutes), teethers (6 minutes), and other objects (9 minutes). The results for children 19 to 36 months old (n = 110) included: pacifiers (126 minutes), plastic toys (2 minutes), teethers (0 minutes), and other objects (2 minutes). Although no significant difference existed between the 2 age ranges for pacifier mouthing duration, a statistically significant difference was observed for nonpacifier objects. For Phase III, the average daily mouthing time for all objects (excluding pacifiers), based on 5 nonconsecutive days of observation for 168 children, was 36 minutes (n = 793 valid child observation days). CONCLUSIONS: Results of this study indicate that mouthing behavior is dependent on age and the types of items that are mouthed. Duration of mouthing varies among children, with some consistently not mouthing any objects and with a very small number mouthing objects for >2 hours a day. The study also revealed wide variability in the types of objects mouthed, including many nontoy objects. Children mouth pacifiers significantly longer than other objects, regardless of age. Significantly increased mouthing time of all nonpacifier objects is reported for children in the 0- to 18-month range compared with the 19- to 36-month range.

Algorithms↗
PubMed1984

Early stages in the organization of cardiovascular control.

Our studies have revealed a number of unexpected characteristics of the immature cardiovascular system of the infant rat. Sympathetic and parasympathetic divisions of the autonomic system appear to have different timetables for the development of tonic and phasic activities. These different timetables of development result in unusual physiological organizations at particular stages in postnatal life. We have described some of the features of one of these: the infant rat's cardiac rate responses in the second week after birth include a high resting rate, decreased rates in response to several (but not all) forms of activation, and two forms of phasic activity, a bradycardia and a tachycardia, that are related to naturally occurring behavioral states and have not been described in adults. The nature of this age-specific autonomic organization was explored further and found to be embedded in the infant's relationship with its mother and in her role as a supplier of nutrient in particular. The mechanisms by which nutrient intake regulates autonomic cardiovascular control during this stage of life have been partially explored by analytic experiments and the results are described along with the possible adaptive value of this regulatory system.

Afferent Pathways↗
PubMed1979

[Effect of rehabilitation of the feeding function on the development of visual-motor coordination and speech in children with infantile cerebral palsy].

The aim of the study was to determine the effect of rehabilitation of feeding function on eye/hand coordination and speech development in cerebral palsied children. The analysis included 28 children with tetraplegic form of cerebral palsy. Age of these children was from 12 to 48 months (in one case 6 months, the other case 6 years). In the first examination, standard deviations in independent feeding function (according to "feeding test") were established as well as the level of eye/hand coordination and speech development (according to Denver Developmental Screening Test). All cerebral palsied children from examined group have had specific helping-exercises according to the method based on normal stages of feeding development. Second examination was performed from 7 to 24 months from the beginning of rehabilitation. The comparative group consisted of 14 children with tetraplegic form of cerebral palsy in this group there were no specific exercises. The parents took them home after short time of stay at the Rehabilitation Department on the basis of the above examinations both group were compared (results presented in the diagrams). It was found, that the method of rehabilitation of feeding function is very useful. Good oral feeding patterns are an essential basis for the skill of muscles and their speech sounds production. Correct position and feeding on self are important for the development of eye/hand coordination. Summing up, rehabilitation of the feeding function should be an integral part of the general problem of rehabilitation of cerebral palsied children.

Cerebral Palsy↗
PubMed1977

[The elimination of the sense of smell and its effect on the suckling behavior in young rabbits].

In the experiments described the ability to smell was eliminated in rabbits aged 1-7 days with two different methods: destruction of the nasal mucous membranes with 2% ZnSO4 solution administered in 2 doses of 100 microliter with a time interval of 12 hours between the two applications and destruction of the olfactory bulbs with high-frequency coagulation (20 V, 80 mA for 12 se.). Both treatments disturbed the suckling behavior, as the young rabbits failed to find the mammary gland. These results suggest that a releaser phenomon is secreted in the mammary gland region, which enables the rabbit to find the test and thus to initiate suckling behavior.

Animals↗
PubMed1998

Thermal, olfactory, and tactile stimuli increase oral grasping of an artificial nipple by the newborn rat.

Caesarean-delivered rat pups tested before any suckling experience show oral grasp responses after stimulation with an artificial nipple. Manipulating the sensory stimuli present at the time of testing alters behavioral responses to the nipple. Specifically, when the nipple is warm, when pups are tested in the presence of amniotic fluid or milk odor, or when pups are tested in the presence of a conspecific, oral grasping of the artificial nipple is increased. Pups respond to the nipple with a shorter latency, show more oral grasp responses, and the individual grasp responses are longer in duration. The experiments suggest that the newborn rat pup exhibits a basic set of behaviors in response to the nipple early in development and that sensory stimuli normally present during the expression of suckling increase oral appetitive behaviors evoked by the nipple.

Animals↗
PubMed1990

Nippling management of the sick neonate in the NICU: the disorganized feeder.

With increased understanding of the feeding needs of high-risk sick neonates, nurses can facilitate adequate weight gain and promote earlier discharges. Disorganization in feeding is usually a temporary problem that caregivers and nurses can help resolve with adequate awareness. Immaturity, severity of illness, prolonged intensive care, and gestational age all contribute to it. Caregivers can successfully feed this disorganized feeder if they recognize the signs and implement environmental and protective measures to facilitate self-regulation, which will hopefully foster organized feeding behaviors.

Humans↗
PubMed1994

Effects of CCK-8 on ingestive behaviors of suckling and weanling rats.

The present series of experiments was designed to determine the dose-response characteristics of the cholecystokinin suppression effect on rat pups ingesting through suckling and adult modes. Pups at 10-22 days of age were deprived of their dam and food for 6 hr. At test time, the subjects received intraperitoneal injections or intravenous infusions of CCK-8 at 2, 4, 8, or 16 micrograms/kg in saline, or the saline vehicle alone. The pups were permitted to ingest for 30 min immediately after the injection or during the infusion. Ingestion included taking milk from the dam by suckling or feeding from the substrate. Regardless of the route of administration, CCK-8 elicited a low level of suppression across all doses and all ages when pups ingested within the natural suckling situation. In marked contrast, pups ingesting from the substrate in the adult mode suppressed their intake of bovine light cream or chow pellets in a dose-related manner following injections of the peptide. The blockade of the CCK dose-related suppression effect during suckling indicates that a different set of mechanisms governs intake of milk from the mother. The results may be related to the level of arousal required to sustain motivated behaviors while pups engage in the different modes of ingestion.

Animals↗
PubMed1993

Maternal aggression of rats is impaired by cutaneous anesthesia of the ventral trunk, but not by nipple removal.

Aggression toward conspecific and allospecific individuals by female mammals is much more likely during lactation than during other reproductive states, a behavior that serves to protect the young. Previous research revealed that removal of nipples (thelectomy) prepartum greatly reduces the likelihood of postpartum aggression in house mice, but not in Sprague-Dawley Norway rats. The present work shows that prepartum thelectomy has no effect on the likelihood or intensity of postpartum aggression toward a strange male intruder in Long-Evans rats. In contrast, anesthesia of each nipple and surrounding skin prevents or severely impairs the elicitation of biting and attacking by the intruder, but does not impair normal retrieval of pups. Following removal of the litter, maternal aggression occurs readily at 1 h and somewhat less so at 5 h, but is absent at 24 h. These data suggest that while maternal aggression in postpartum rats does not require suckling, it is dependent on somatosensory stimulation of the ventral trunk by pups; this stimulation apparently produces a motivational change that lasts several hours.

Aggression↗
PubMed1995

Mother as shield: differential effects of contact and nursing on pain responsivity in infant rats--evidence for nonopioid mediation.

To determine how rat mothers protect their pups against pain, we applied focal heat (34-51 degrees C) to the ear or shoulder of 10-day-old rats that were isolated, in contact among themselves or with their mother, suckling nonnutritively, or in the hyperextension position normally caused by milk letdown. Relative to isolated rats, contact doubled withdrawal latencies from heat (43 or 45 degrees C) applied to the ear. Suckling quadrupled heat-escape latencies. During hyperextension, rats essentially did not escape from thermal stimulation of up to 48 degrees C. Protection provided by maternal contact, especially suckling, was not mediated by either mu or kappa opioid receptors: neither systemic injections of naltrexone nor norbinaltorphimine reduced heat-escape latencies. Morphine (0.125 and 0.250 mg/kg) added to the effects of contact but multiplied the effects of suckling to produce heat-escape latencies that were upward of 2 min.

Animals↗