Food sharing in albino rat pups: Does familiarity breed contempt?

The present experiment investigated the effects of kinship and familiarity upon food sharing in pairs of albino rat pups. Five pairs of rats from each of the following groups were tested: (1) familiar siblings, (2) nonfamiliar siblings, (3) familiar nonsiblings, and (4) nonfamiliar non-siblings. A small food portion was used, necessitating not only close physical contact, but also cooperation in the sense that both pups were required to remain relatively immobile in order for both to feed simultaneously. Results indicated more frequent sharing among unfamiliar pups, whether related or not. Results also indicated that food sharing increased in frequency among all four groups over the 5-day testing period, suggesting that cooperation in the form of food sharing can develop, or increase in frequency, over time in albino rat pups.     

Children's Comparisons of the Recency of Two Events from the Past Year

Research on memory for time has been limited by the difficulty of disentangling several of the fundamentally different processes that contribute to a chronological sense of the past. This study used a developmental approach to isolate one of these processes, impressions of distances in the past. Large samples of children between 3 and 12 years were asked to judge which was longer ago, their birthday or Christmas (and, in one study, Halloween and Thanksgiving). Even children under 6 years of age were able to discriminate the recency of their birthday and Christmas with great accuracy when the events were widely separated and one was within the past several months. The ability to discriminate recency on these scales appears to be a basic property of human memory that changes little with development. Other information about the locations of the events and their relative times of occurrence could only be interpreted correctly by children older than 9 years.     

多功能实验动物(兔)手术台的研制及其应用

介绍了一种多功能实验动物(兔)手术台的研制及在教学和科研中的应用,该手术台在原手术台的基础上对一些部件进行了改进,增加了麻醉装置,改进后的手术台不仅方便了实验操作,提高了麻醉效果,而且使实验成功率大大提高。     

Relations Among the Home Language and Literacy Environment and Children’s Language Abilities: A Study of Head Start Dual Language Learners and Their Mothers

Research Findings: This study explored the relations between Spanish–English dual language learner (DLL) children’s home language and literacy experiences and their expressive vocabulary and oral comprehension abilities in Spanish and in English. Data from Spanish–English mothers of 93 preschool-age Head Start children who resided in central Pennsylvania were analyzed. Children completed the Picture Vocabulary and Oral Comprehension subtests of the Batería III Woodcock–Muñoz and the Woodcock–Johnson III Tests of Achievement. Results revealed that the language spoken by mothers and children and the frequency of mother–child reading at home influenced children’s Spanish language abilities. In addition, the frequency with which children told a story was positively related to children’s performance on English oral language measures. Practice or Policy: The findings suggest that language and literacy experiences at home have a differential impact on DLLs’ language abilities in their 2 languages. Specific components of the home environment that benefit and support DLL children’s language abilities are discussed.     

The Development of Children's Memory for the Time of Past Events

Previous research on adults' and children's memory for the time of past events has generally overlooked the fundamental distinction between knowledge of temporal distance in the past and knowledge of temporal locations. This study applied the distinction to the development of time memory. Children of 4, 6, and 8 years of age experienced 2 target events, one 7 weeks and the other 1 week before testing. They were asked to judge the relative recency of the 2 events and to localize the older event by time of day, day of the week, month, and season. Even the 4-year-olds were successful in judging the relative recency of the 2 events and localizing the older event by time of day. However, on the 3 longer time scales, only the 6- and 8-year-olds could localize the older event, reason about possible times that it could have occurred, or tell the present time. The great accuracy of the time-of-day judgments at all 3 ages is almost certainly not due to distance-type information. The results show the separate development of distance and location judgments.     

The development of children's knowledge of temporal structure

Adults have a rich understanding of a number of time systems, but little is known about how this knowledge develops. 3 experiments were conducted to test a model in which the first representations of the days of the week and months of the year have verbal-list properties, and these are later supplemented by image representations. In Experiments 1 and 2, fourth or fifth graders could judge forward relative order for these contents, but not until adolescence could backward order judgments be made accurately. In Experiment 3, fourth graders used a serial process to solve a categorical distance judgment task, whereas older groups shifted to a process with more rapid access to information about the position of remote items. The results are interpreted as supporting the 2-stage model and appear inconsistent with a number of alternative models.     

School-level facilitators of inclusive education: the case of Serbia

Relying on Bronfenbrenner’s ecological model, this paper attempts to identify school-level factors that contribute to effective implementation of inclusive education. We also explored how government policy, with emphasis on individual education plans, school teams, Roma assistants and inter-sectorial committees, is implemented at the school level. Qualitative data were collected from various informants (students, parents, teachers, school associates, Roma assistants and local community representatives) in five schools selected on the basis of regional distribution and success in supporting diverse student needs. Two core categories of school-level facilitators were generated: inclusive practices and inclusive culture. Within the first category, which refers to concrete actions and relationships in the school and local community, five themes emerged: individualisation and use of individual education plans; cooperation between teachers and school inclusive education expert team; cooperation with internal and external specialists; cooperation with parents, and cooperation with the local community. The second category, which reflects beliefs, values and implicit school norms, was further divided into five subcategories: willingness for life-long learning; proactive stance; sense of teamwork; sophisticated personal philosophies of development and learning; and acceptance of difference. We concluded that successful schools have developed into professional learning communities. Finally, recommendations for improving relevant practices were provided.     

The development of children's knowledge of the times of future events

Four studies with 261 children were conducted to describe 4- through 10-year-olds' ability to differentiate the future distances of events. Distances ranged from later the same day through nearly a year in the future. Judgment methods included pointing to parts of a spatial scale representing future distances and answering open-ended questions. Although 4-year-olds failed to differentiate future distances, 5-year-olds were able to distinguish events that would occur in the coming weeks and months from those that would not occur for many months. However, like young children in earlier studies of memory for time, they confused the near future with the recent past. Children 6 through 8 years of age made more differentiated judgments but collapsed the distances of events more than a few months in the future. By 8 to 10 years of age, children accurately judged distances by using mental representations of the times of events in the annual cycle.     

Disposition and health outcomes among infants born to mothers with no prenatal care

ObjectiveThis study assessed infant disposition and health outcomes among offspring born to mothers without prenatal care, based on maternal characteristics and the reason for lack of prenatal care (i.e., denial of pregnancy, concealment of pregnancy, primary substance use, financial barriers and multiparity).MethodsA retrospective record review was completed at an urban academic medical center. Subjects were women who presented at delivery or immediately postpartum with no history of prenatal care (N = 211), and their infants.ResultsInfants of mothers with substance use problems had the highest rates of referral to child protective services and out-of-home placement at discharge, though mothers with other reasons for no prenatal care also experienced both referral and placement. Infants born to mothers using substances experienced the highest rates of neonatal intensive care unit admission, and the lowest mean birth weight.ConclusionsThough those without prenatal care experienced a variety of adverse outcomes, substance use problems were most frequently correlated with adverse infant outcomes. Mothers who either had lost custody of other children or with substance use problems were at highest risk of losing custody of their infants. Those who denied or concealed their pregnancy still frequently retained custody.Practice implicationsAmong mothers without prenatal care, those with substance use problems were least likely to retain custody of their infant at hospital discharge. Custody status of the mother's other children was also independently associated with infant custody. Mothers who denied or concealed their pregnancy still often retained custody. Referrals of mothers with no prenatal care for psychiatric evaluation were rare, though referrals to social work were frequent. Child protective services occasionally did not investigate referrals in the denial and concealment groups. Healthcare providers should be aware of the medical and psychological needs of this vulnerable population of infants and mothers.