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41.
We investigated newborns' sensitivity to the direction of gaze of another's face by using a preferential looking technique. This study extends earlier work on a preference for faces with direct gaze in newborns. In Experiment 1, we replicate the basic finding of Farroni and colleagues that newborns prefer to look at faces with direct gaze. In Experiments 2 and 3, we establish that a preference for faces with direct gaze in newborns is present only within the context of an upright face and a straight head, suggesting that relatively primitive configuration-sensitive mechanisms may be operating. Overall, these results further the view that relatively simple perceptual biases in newborns may be an essential foundation for later social-cognitive development. 相似文献
42.
Sobanawartiny Wijeakumar Aarti Kumar Lourdes M. Delgado Reyes Madhuri Tiwari John P. Spencer 《Developmental science》2019,22(5)
There is a growing need to understand the global impact of poverty on early brain and behavioural development, particularly with regard to key cognitive processes that emerge in early development. Although the impact of adversity on brain development can trap children in an intergenerational cycle of poverty, the massive potential for brain plasticity is also a source of hope: reliable, accessible, culturally agnostic methods to assess early brain development in low resource settings might be used to measure the impact of early adversity, identify infants for timely intervention and guide the development and monitor the effectiveness of early interventions. Visual working memory (VWM) is an early marker of cognitive capacity that has been assessed reliably in early infancy and is predictive of later academic achievement in Western countries. Here, we localized the functional brain networks that underlie VWM in early development in rural India using a portable neuroimaging system, and we assessed the impact of adversity on these brain networks. We recorded functional brain activity as young children aged 4–48 months performed a VWM task. Brain imaging results revealed localized activation in the frontal cortex, replicating findings from a Midwestern US sample. Critically, children from families with low maternal education and income showed weaker brain activity and poorer distractor suppression in canonical working memory areas in the left frontal cortex. Implications of this work are far‐reaching: it is now cost‐effective to localize functional brain networks in early development in low‐resource settings, paving the way for novel intervention and assessment methods. 相似文献
43.
The speech register that adults especially caregivers use when interacting with infants and toddlers, that is, infant-directed speech (IDS) or baby talk, has been reported to facilitate language development throughout the early years. However, the neural mechanisms as well as why IDS results in such a developmental faciliatory effect remain to be investigated. The current study uses functional near-infrared spectroscopy (fNIRS) to evaluate two alternative hypotheses of such a facilitative effect, that IDS serves to enhance linguistic contrastiveness or to attract the child's attention. Behavioral and fNIRS data were acquired from twenty-seven Cantonese-learning toddlers 15–20 months of age when their parents spoke to them in either an IDS or adult-directed speech (ADS) register in a naturalistic task in which the child learned four disyllabic pseudowords. fNIRS results showed significantly greater neural responses to IDS than ADS register in the left dorsolateral prefrontal cortex (L-dlPFC), but opposite response patterns in the bilateral inferior frontal gyrus (IFG). The differences in fNIRS responses to IDS and to ADS in the L-dlPFC and the left parietal cortex (L-PC) showed significantly positive correlations with the differences in the behavioral word-learning performance of toddlers. The same fNIRS measures in the L-dlPFC and right PC (R-PC) of toddlers were significantly correlated with pitch range differences of parents between the two speech conditions. Together, our results suggest that the dynamic prosody in IDS increased toddlers’ attention through greater involvement of the left frontoparietal network that facilitated word learning, compared to ADS. 相似文献
44.
Tom L. Beauchamp 《The Journal of Ethics》1998,2(2):143-158
Affirmative action refers to positive steps taken to hire persons from groups previously and presently discriminated against. Considerable evidence indicates that this discrimination is intractable and cannot be eliminated by the enforcement of laws. Numerical goals and quotas are justified if and only if they are necessary to overcome the discriminatory effects that could not otherwise be eliminated with reasonable efficiency. Many past as well as present policies are justified in this way. 相似文献
45.
A model for preferential and triadic choice is derived in terms of weighted sums of centralF distribution functions. This model is a probabilistic generalization of Coombs' (1964) unfolding model and special cases, such as the model of Zinnes and Griggs (1974), can be derived easily from it. This new form extends previous work by Mullen and Ennis (1991) and provides more insight into the same problem that they discussed. 相似文献
46.
本研究以66对17至32个月的幼儿和母亲为研究对象,研究了在实验室情境中,幼儿在不同实验情境下对母亲的社会朝向反应,并探讨了幼儿社会朝向行为的功能以及母亲的行为对幼儿社会朝向反应的影响。结果显示,（1）大多数幼儿在实验中都表现出了至少一次的社会朝向反应,社会朝向反应的发生是酱遍的;（2）在不同情境中,幼儿的社会朝向反应不同,在积极的情境中,社会朝向反应有分享情绪经历的功能;在抗拒诱惑的任务中,社会朝向行为与获得支持有关;（3）母亲对情境的非信息性反应对幼儿的社会朝向行为有影响,社会朝向是幼儿对社会情境的适应性行为,对这种非语言的情感交流行为的研究可以帮助我们探究幼儿情绪社会化的过程。 相似文献
47.
John J. Carvalho 《Zygon》2007,42(2):289-300
One of the most threatening problems the world faces is the growing poverty crisis and the related human rights inequalities and the spread of diseases in underprivileged areas. Human rights and relief organizations try hard to contain the devastation of these interconnected difficulties. What is the role of the biomedical scientist in this endeavor? The challenges that biomedical scientists face in their research lead us to question whether scientists can go beyond the time‐consuming realm of experimental investigation and engage the issues of society in a more public way. I suggest how the scientist's role can be expanded in our complex and precarious world, introducing the idea of the modern biomedical researcher as scientist, scholar‐philosopher, and statesman for the scientific community and the larger human rights community. I provide examples of where the scientist can interface with human rights organizations, medical doctors, political and civic leaders, and the science‐religion dialogue. My argument reveals the emerging role of the biomedical scientist as one of public service in addition to and beyond the realm of the experimental investigator. This role, however, is formidable, and I list some of the obstacles it entails. 相似文献
48.
Lorraine E. Bahrick 《Infant behavior & development》1987,10(4):387-416
Infants' intermodal perception of two levels of temporal structure uniting the visual and acoustic stimulation from natural, complex events was investigated in four experiments. Films depicting a single object (single, large marble) and a compound object (group of smaller marbles) colliding against a surface in an erratic pattern were presented to infants between 3 and months of age using an intermodal preference and search method. These stimulus events portrayed two levels of invariant temporal structure: (a) temporal synchrony united the sights and sounds of object impact, and (b) temporal microstructure, the internal temporal structure of each impact sound and motion, specified the composition of the object (single vs. compound). Experiment 1 demonstrated that by 6 months infants detected a relation between the audible and visible stimulation from these events when both levels of invariant temporal structure guided their intermodal exploration. Experiment 2 revealed that by 6 months infants detected the bimodal temporal microstructure specifying object composition. They looked predominantly to the film whose natural soundtrack was played even though the motions of objects in both films were synchronized with the soundtrack. Experiment 3 assessed infants' sensitivity to temporal synchrony relations. Two films depicting objects of the same composition were presented while the motions of only one of them was synchronized with the appropriate soundtrack. Both 6-month-olds showed evidence of detecting temporal synchrony relations under some conditions. Experiment 4 examined how temporal synchrony and temporal microstructure interact in directing intermodal exploration. The natural soundtrack to one of the objects was played out-of-synchrony with the motions of both. In contrast with the results of Experiment 2, infants at 6 months showed no evidence of detecting a relationship between the film and its appropriate soundtrack. This suggests that the temporal asynchrony disrupted their detection of the temporal microstructure specifying object composition. Results of these studies support on invariant-detection view of the development of intermodal perception. 相似文献
49.
Stuart Marcovitch Melissa W. Clearfield Margaret Swingler Susan D. Calkins Martha Ann Bell 《Infant and child development》2016,25(4):233-246
In the first year of life, the ability to search for hidden objects is an indicator of object permanence and, when multiple locations are involved, executive function (i.e. inhibition, cognitive flexibility and working memory). The current study was designed to examine attentional predictors of search in 5‐month‐old infants (as measured by the looking A‐not‐B task), and whether levels of maternal education moderated the effect of the predictors. Specifically, in a separate task, the infants were shown a unique puppet, and we measured the percentage of time attending to the puppet, as well as the length of the longest look (i.e., peak fixation) directed towards the puppet. Across the entire sample (N = 390), the percentage of time attending to the puppet was positively related to performance on the visual A‐not‐B task. However, for infants whose mothers had not completed college, having a shorter peak looking time (after controlling for percentage of time) was also a predictor of visual A‐not‐B performance. The role of attention, peak fixation and maternal education in visual search is discussed. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
50.