What is ‘Natural’ in Natural Selection?

To understand Darwin’s concept of natural selection, we have to contrast it with his characterization of artificial selection, and then ask: what is natural in natural selection? While we do this, we develop two distinctions: one between ‘change by transformative action’ and ‘change by selection’, and another between ‘artificial selection’ and ‘natural selection’. The first distinction helps us understand evolution by selection and the second natural selection.     

Eye-movement parameters and reading speed

This study addressed the relationship between four eyemovement parameters and reading speed of 20twelve-year-old children during silent and oralreading. The results indicated that each of theparameters correlated significantly with speed ofsilent reading. In fact, reading speed could bepredicted by the following variables: recognitionspan, average fixation duration, and number ofregressive saccades. Moreover, the relationshipbetween silent and oral reading speed, on one hand,and between reading fluency and reading errors in oralreading speed, on the other, was examined. The resultsindicated that in terms of reading speed, significantinterrelationships existed between silent and oralreading. Furthermore, fluency and errors wereintercorrelated phenomena, but only fluency wassubstantially related to oral reading speed.     

Body or Mind: Children's Categorizing of Pretense

Researchers studying early social cognition have been particularly interested in pretend play and have obtained evidence indicating that young children do not understand that pretending involves mental representation. The present research investigates whether children think of pretending as a mental state at all, by looking at whether they cluster it with other mental states or with physical processes when making certain judgments. The results from 5 experiments suggest that most children under 6 years of age see pretending as primarily physical. Further, when asked about pretending as a 2-part process entailing planning and execution, even 8-year-olds claim that execution of pretense does not involve the mind, although the planning aspect of pretense does.     

The Role of Extended Time and Item Content on a High‐Stakes Mathematics Test

The premise of a great deal of current research guiding policy development has been that accommodations are the catalyst for student performance differences. Rather than accepting this premise, two studies were conducted to investigate the influence of extended time and content knowledge on the performance of ninth‐grade students who took a statewide mathematics test with and without accommodations. Each study involved 1,250 accommodated students (extended time only) with learning disabilities and 1,250 nonaccommodated students demonstrating no disabilities. In Study One, a standard differential item functioning (DIF) analysis illustrated that the usual approach to studying the effects of accommodations contributes little to our understanding of the reason for performance differences across students. Next, a mixture item response theory DIF model was used to explore the most likely cause(s) for performance differences across the population. The results from both studies suggest that students for whom items were functioning differently were not accurately characterized by their accommodation status but rather by their content knowledge. That is, knowing students' accommodation status (i.e., accommodated or nonaccommodated) contributed little to understanding why accommodated and nonaccommodated students differed in their test performance. Rather, the data would suggest that a more likely explanation is that mathematics competency differentiated the groups of student learners regardless of their accommodation and/or reading levels.     

Exercise and mental health: it's just not psychology!

Exercise has been suggested as an effective adjunctive treatment for a range of mental health conditions. In this study, we explored the perceptions of exercise held by course directors of doctoral training programmes in clinical psychology in England. Given the exploratory nature of the study, we used a qualitative design incorporating semi-structured interviews. Although most participants held favourable attitudes regarding exercise, this was related more to exercise being seen as a positive lifestyle activity that is worth encouraging, rather than exercise being recommended as an adjunctive treatment for mental health problems. Inductive analysis identified four themes that underpinned such a response: inconsistent positions on the evidential criteria used to evaluate the role of exercise, which masked themes regarding the perceived 'simplicity' of exercise interventions, a practical adherence to a mind-body dichotomy, and the incompatibility of exercise with traditional models of understanding and treating clinical conditions. The barriers we have highlighted will continue to hinder the consideration of exercise as a common therapeutic adjunct at present. Although further research is required to examine the relationship between exercise and mental health, consideration must also be given to how such research should be disseminated to mental health professionals.     

Research on teaching in physical education.

This article reviews research on teaching in physical education. I first consider research methodology employed in this area and then examine research related to instructional effectiveness, classroom ecology, and cognition and decision making. Conclusions and future directions are then presented that have implications for researchers, teachers, and teacher educators.