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Charles H. Zeanah Megan R. Gunnar Robert B. McCall Jana M. Kreppner Nathan A. Fox 《Monographs of the Society for Research in Child Development》2011,76(4):147-162
This chapter reviews sensitive periods in human brain development based on the literature on children raised in institutions. Sensitive experiences occur when experiences are uniquely influential for the development of neural circuitry. Because in humans, we make inferences about sensitive periods from evaluations of complex behaviors, we underestimate the occurrence of sensitive periods at the level of neural circuitry. Although we are most interested in complex behaviors, such as IQ or attachment or externalizing problems, many different sensitive periods at the level of circuits probably underlie these complex behaviors. Results from a number of studies suggest that across most, but not all, domains of development, institutional rearing limited to the first 4–6 months of life is associated with no significant increase risk for long‐term adverse effects relative to noninstitutionalized children. Beyond that, evidence for sensitive periods is less compelling, meaning that “the earlier the better” rule for enhanced caregiving is a reasonable conclusion at the current state of the science. 相似文献
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Beckett C Maughan B Rutter M Castle J Colvert E Groothues C Kreppner J Stevens S O'connor TG Sonuga-Barke EJ 《Child development》2006,77(3):696-711
Cognitive outcomes at age 11 of 131 Romanian adoptees from institutions were compared with 50 U.K. adopted children. Key findings were of both continuity and change: (1) marked adverse effects persisted at age 11 for many of the children who were over 6 months on arrival; (2) there was some catch-up between ages 6 and 11 for the bottom 15%; (3) there was a decrease of 15 points for those over 6 months on arrival, but no differentiation within the 6-42-month range; (4) there was marked heterogeneity of outcome but this was not associated with the educational background of the adoptive families. The findings draw attention to the psychological as well as physical risks of institutional deprivation. 相似文献
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Rebecca J. Ward Hanna Kovshoff Jana Kreppner 《British Educational Research Journal》2023,49(5):1044-1064
Inclusive education for children with attention deficit hyperactivity disorder (ADHD) presents challenges for school staff and professional development is lacking. Training is not always available when needed, strategies suggested by external experts can be impractical and staff lack autonomy in choosing the best way of being resourced. Additionally, the experience and knowledge of the range of school staff is not utilised. A collaborative working group of school staff and a researcher explored an alternative method of ADHD resourcing. Co-construction of knowledge defines how the group discursively identified actionable knowledge from the different perspectives and knowledge brought by individual group members. A systemic framework was used to critically reflect on the collaboration. The framework enabled reflection on four areas to understand how and why the collaboration led to a published web-based school staff ADHD resource. Firstly, starting conditions and assumptions were considered to identify and articulate the rationale for the resource. Secondly, the context and system dynamics enabled consideration of the socio-cultural and political landscape of the project and the impact of COVID-19. Thirdly, the different voices of participants and power dynamics were reflected on. Finally, emergence was a frame in which to elucidate knowledge production and changes in practice. The collaborative working group addressed the research–practice gap and the need for diversity of voices to be heard across the school. Knowledge co-construction positions staff as knowledge bearers and, together with different forms of knowledge, they can be empowered to create new, contextualised evidence-based knowledge. 相似文献
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Sweat lactate reflects eccrine gland metabolism. However, the metabolic tendencies of eccrine glands in a hot versus thermoneutral environment are not well understood. Sixteen male volunteers completed a maximal cycling trial and two 60-min cycling trials [30°C?=?30±1°C and 18°C?=?18±1°C wet bulb globe temperature (WBGT)]. The participants were requested to maintain a cadence of 60 rev?·?min?1 with the intensity individualized at ～ 90% of the ventilatory threshold. Sweat samples at 10, 20, 30, 40, 50 and 60?min were analysed for lactate concentration. Sweat rate at 30°C (1380±325?ml?·?h?1) was significantly greater (P<0.05) than at 18°C (632±311?ml?·?h?1). Sweat lactate concentration was significantly greater (P<0.05) at each time point during the 18°C trial, with values between trials tending to converge across time. During the 30°C trial, both heart rate (20, 30, 40, 50 and 60?min) and rectal temperature (30, 40, 50 and 60?min) were significantly higher than in the 18°C trial. Higher sweat lactate concentrations coupled with lower sweat rates may indicate a greater relative contribution of oxygen-independent metabolism within eccrine glands during exercise at 18°C. Decreases in sweat lactate concentration across time suggest either greater dilution due to greater sweat volume or increased reliance on aerobic metabolism within eccrine glands. The convergence of lactate concentrations between trials may indicate that time-dependent modifications in sweat gland metabolism occur at different rates contingent partially on environmental conditions. 相似文献
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The current study extends previous research on a sample of children adopted into the United Kingdom following severe early deprivation and a comparison sample of nondeprived, within-country, early adoptees. We assessed 165 children adopted from Romania and 52 U.K. adoptees at age 6 years. Longitudinal data (at age 4 and 6 years) were available on 111 Romanian adoptees placed into U.K. homes before 24 months of age and on all U.K. adoptees. Results indicated that there was considerable catch-up among late-placed Romanian children from entry into the United Kingdom to age 6, but as a group they exhibited lower cognitive scores and general developmental impairment compared with earlier adopted Romanian children. In addition, the resilience suggested at the assessment at age 4 years was maintained longitudinally, but there was no further evidence of catch-up or recovery. 相似文献
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