Children's Proportional Judgments: The Importance of "Half"

3 experiments are reported, all of which show the crucial importance of the "half" boundary in children's proportional judgments. In the first experiment 4-, 5-, 6-, and 7-year-old children had to judge which of 2 boxes of blue and white bricks was represented in a small picture. The proportion of blue to white bricks was different in the 2 boxes, and the question was whether the children could use these proportions to make their choices. The 6- and 7-year-old children solved the problem much more successfully when the proportions crossed the "half" boundary (e.g., 3/8 blue vs. 5/8 blue). The second experiment showed that discriminations involving half (e.g., 1/2 blue vs. 1/4 blue) are also easier than those that do not cross the "half" boundary for the 6- and 7-year-olds. The third experiment confirmed the results of the first 2 with pictures of different absolute sizes from each other. We conclude that "half" plays a crucial role in children's early proportional reasoning, and that the "half" boundary is to some extent similar to, though not as powerful as, the category boundaries discovered in speech perception.     

The Impact of Campus Context,College Encounters,and Religious/Spiritual Struggle on Ecumenical Worldview Development

Using a national longitudinal sample of 14,274 college students generated as part of the UCLA Spirituality in Higher Education Project, this study employed structural equation modeling to analyze how students develop an ecumenical worldview. The findings suggest that challenging co-curricular experiences and the salience of religion and spirituality in academic encounters tend to provoke religious/spiritual struggles, which in turn enhance ecumenical worldview.     

How children learn about morphological spelling rules

A 2-year longitudinal study was carried out to test the hypothesis that children's word-specific learning of inflectional spellings is an essential first step in their acquiring an understanding of morphological rules for spelling inflections. Ninety children, who were 6-years-old at the start of the project, were asked to spell pseudowords and real words on three separate occasions. Inflections in pseudowords can be spelled only on the basis of morphological spelling rules, whereas the same inflections in real words can be spelled either through familiarity with the specific words (word-specific knowledge) or through morphological rules. Cross-lagged correlations suggested that the children's initial word-specific learning may be the basis for their later adoption and use of morphological spelling rules.     

Peer assessment in a test-dominated setting: empowering, boring or facilitating examination preparation?

The literature suggests that peer assessment contributes to the development of student learning and promotes ownership of assessment processes. These claims emerge from research conducted primarily in Western contexts. This exploratory paper reports on the perspectives that a class of Hong Kong primary school students and their teachers have on their engagement with peer assessment. It draws on data collected through extensive interviews and classroom observations from a 2-year case study. The findings indicate that student perceptions about the usefulness of peer assessment follow from their perspectives on quality of peer feedback, peer language proficiency, and the novelty or repetitiveness of its processes. Teachers and students also viewed peer assessment as assuming a wider role in preparing for examinations and future secondary schooling. A key implication is that assessment practices are deeply cultural and, in test-dominated settings, peer assessment may have most potential when explicit links are drawn with preparation for summative assessment.     

How do pre-kindergarteners spend their time? Gender,ethnicity, and income as predictors of experiences in pre-kindergarten classrooms

The current paper considers how children spend their time in state-funded pre-kindergarten programs and how time use relates to ethnicity, gender, and family income, based on the assumption that how time is spent in pre-kindergarten is relevant for the programs’ success in narrowing achievement gaps. Classroom observations of 2061 children in 652 pre-k programs in 11 states were analyzed. Findings indicated that the pre-kindergarten day was roughly equally divided among free choice, teacher-assigned activities, and meals/routines. Children spent much of their time in language/literacy, social studies, and art, and less time in math and gross motor activities. Much of the pre-k day was spent in ‘no coded learning activity.’ Children in classes with lower proportions of Latino and African American children and higher average income-to-need ratios were generally engaged in richer and more stimulating experiences. The child-level variables of ethnicity and income were generally unrelated to how children spent their time, above and beyond the effects of classroom-level ethnicity and income. There were generally small, but significant gender differences – always in the gender-stereotyped direction – in how time was spent, especially during free choice time.     

Effects of increasing and decreasing physiological arousal on anticipation timing performance during competition and practice

The aim of this study was to investigate if the effects of changes in physiological arousal on timing performance can be accurately predicted by the catastrophe model. Eighteen young adults (8 males, 10 females) volunteered to participate in the study following ethical approval. After familiarisation, coincidence anticipation was measured using the Bassin Anticipation Timer under four incremental exercise conditions: Increasing exercise intensity and low cognitive anxiety, increasing exercise intensity and high cognitive anxiety, decreasing exercise intensity and low cognitive anxiety and decreasing exercise intensity and high cognitive anxiety. Incremental exercise was performed on a treadmill at intensities of 30%, 50%, 70% and 90% heart rate reserve (HRR) respectively. Ratings of cognitive anxiety were taken at each intensity using the Mental Readiness Form 3 (MRF3) followed by performance of coincidence anticipation trials at speeds of 3 and 8 mph. Results indicated significant condition × intensity interactions for absolute error (AE; p = .0001) and MRF cognitive anxiety intensity scores (p = .05). Post hoc analysis indicated that there were no statistically significant differences in AE across exercise intensities in low–cognitive anxiety conditions. In high–cognitive anxiety conditions, timing performance AE was significantly poorer and cognitive anxiety higher at 90% HRR, compared to the other exercise intensities. There was no difference in timing responses at 90% HRR during competitive trials, irrespective of whether exercise intensity was increasing or decreasing. This study suggests that anticipation timing performance is negatively affected when physiological arousal and cognitive anxiety are high.     

Surface protein gradients generated in sealed microchannels using spatially varying helium microplasma

Spatially varied surface treatment of a fluorescently labeled Bovine Serum Albumin (BSA) protein, on the walls of a closed (sealed) microchannel is achieved via a well-defined gradient in plasma intensity. The microchips comprised a microchannel positioned in-between two microelectrodes (embedded in the chip) with a variable electrode separation along the length of the channel. The channel and electrodes were 50 μm and 100 μm wide, respectively, 50 μm deep, and adjacent to the channel for a length of 18 mm. The electrode separation distance was varied linearly from 50 μm at one end of the channel to a maximum distance of 150, 300, 500, or 1000 μm to generate a gradient in helium plasma intensity. Plasma ignition was achieved at a helium flow rate of 2.5 ml/min, 8.5 kV_pk-pk, and 10 kHz. It is shown that the plasma intensity decreases with increasing electrode separation and is directly related to the residual amount of BSA left after the treatment. The plasma intensity and surface protein gradient, for the different electrode gradients studied, collapse onto master curves when plotted against electrode separation. This precise spatial control is expected to enable the surface protein gradient to be tuned for a range of applications, including high-throughput screening and cell-biomolecule-biomaterial interactions.