Objective: Twin and family studies of autistic traits and of cases diagnosed with autism suggest high heritability; however, the heritability of autistic traits in toddlers has not been investigated. Therefore, this study's goals were (1) to screen a statewide twin population using items similar to the six critical social and communication items…

Two studies examined the inductive potential of various social categories among 144 kindergarten, 2nd-, and 6th-grade Israeli children from 3 sectors: secular Jews, religious Jews, and Muslim Arabs. Study 1--wherein social categories were labeled--found that ethnic categories were the most inductively powerful, especially for religious Jewish…

Instructional metaphors scaffold learning better when accompanied by an elaboration. Applying structure mapping theory, we developed and used an elaborated instructional metaphor (text and illustrations) for introductory chemistry concepts. In two studies (N[subscript 1] = 44, N[subscript 2] = 57), college students with little chemistry background…

Identifying whether suicides in a region are due to characteristics of the residents living there or to some enduring feature of the region is difficult when using cross-sectional studies. To distinguish these factors, we compared the suicides of a region's residents with people who were temporarily visiting the region. Using U.S. death records…

This paper describes three spreadsheet exercises demonstrating the nature and frequency of type I errors using random number generation. The exercises are designed specifically to address issues related to testing multiple relations using correlation (Demonstration I), t tests varying in sample size (Demonstration II) and multiple comparisons…

Teaching world cultures in the middle-level geography classroom presents challenges both because of the complexity of culture and because of the characteristics of students of this age. One effective way to teach about a culture is through the use of cultural artifacts. This article discusses how to collect and use cultural artifacts in the…

Many statistics texts pose inferential statistical problems in a disjointed way. By using a simple five-step procedure as a template for statistical inference problems, the student can solve problems in an organized fashion. The problem and its solution will thus be a stand-by-itself organic whole and a single unit of thought and effort. The…

Jans, Peters, and De Weerd (2010) examined the studies demonstrating that spatial attention can be split across 2 noncontiguous target locations. They find all these studies to be flawed and conclude that spatial attention only selects a single location at any given time. They do, however, suggest that there could be exceptional circumstances that…

In Shadish (2010) and West and Thoemmes (2010), the authors contrasted 2 approaches to causality. The first originated in the psychology literature and is associated with work by Campbell (e.g., Shadish, Cook, & Campbell, 2002), and the second has its roots in the statistics literature and is associated with work by Rubin (e.g., Rubin, 2006). In…

This article compares Donald Campbell's and Donald Rubin's work on causal inference in field settings on issues of epistemology, theories of cause and effect, methodology, statistics, generalization, and terminology. The two approaches are quite different but compatible, differing mostly in matters of bandwidth versus fidelity. Campbell's work…

On the Southeast Asian island-nation of Singapore, many elementary schools feature a different kind of field trip. Under the name "fieldwork," first- through sixth-grade students regularly venture out of the school on excursions into the community. They conduct surveys and interviews, do simple experiments, observe and gather relevant…

The Elementary and Secondary Education Act (ESEA) has had several tangible effects on education and the monitoring of education. There have been both intended and unintended consequences. ESEA's newer generation of federal programs, such as Race to the Top, and the recent ESEA flexibility guidelines, have continued to push development of methods…

There is increasing interest in the role of phonological awareness across languages. However, the role of phonological awareness in various languages may differ by features of the languages as well as by features of the speakers. The current meta-analysis catalogs these relations and examines factors that may have influenced how closely related…

In this article, we report the results of a study on the relationship between individual differences in language learning aptitude and the structural connectivity of language pathways in the adult brain, the first of its kind. We measured four components of language aptitude ("vocabulary learning"; "sound recognition"; "sound-symbol…

In recent years there has been widespread interest in the implementation of information and communication technologies (ICT) in schools. While most studies primarily focus on the use of ICT in teaching and learning, little attention has been given to their incorporation as a professional tool outside the classroom. Using a digital inequality…