Taxisin Aplysia dactylomela (Rang, 1828) to water-borne stimuli from conspecifics

Sixteen reproductively matureAplysia dactylomela were observed in a unidirectional stream under each of four conditions: sea water only, one sea hare, six sea hares, and a copulating sea hare pair. Streams containing conspecific stimulation were significantly more effective in eliciting a positive taxis towards the stimulus source. A copulating pair was not different from one or six animals in producing the approach. The sea hares showed a distinct final head orientation to six sea hares when compared with sea water only; final orientation did not differ in any other comparison.     

On a theory of instruction: Why different forms of instruction result in similar knowledge

Why can instructional processes having widely different topographies—such as teaching through a demonstration (modeling), teaching through verbal explanation, and teaching by simply providing an occasion for the child's direct contingent experience—all result in the development of the same or similar knowledge? A recent series of experiments that examined the role of instruction in the intellectual development of young children provides evidence for the equivalence of different forms of instruction and leads to the postulation of a set of invariant processes of information exchange that underlies the surface characteristics of various forms of instruction.     

Evaluating the quality of peer and self evaluations as measures of student contributions to group projects

ABSTRACT

Educators in higher education commonly use peer and self evaluations to help assess student performance on group projects. Although these evaluations provide multiple benefits, many educators are wary of using them due to concerns about their quality. This study addresses three questions debated in the literature regarding the quality of these assessments. How much do students differentiate among peer contributions through their ratings? How reliable are peer ratings? How much agreement exists between peer and self ratings? Although these questions have been addressed to varying degrees in past work, their answers have been far from settled. While many studies focus on just one of the questions, this study’s data make it possible to address all three questions for the same group of students as well as examine each question by student performance level. The evaluations assessed in this study were completed by a large number of students under conditions associated with obtaining more valid and reliable ratings. Overall, the results provide support for using peer and self evaluations to help assess student contributions to group projects. Peer ratings were largely reliable as group members generally agreed on the scores given to their peers. In addition, most students differentiated among group member contributions through their ratings. Students also tended to rate themselves higher than their peers rated them. This study has implications for how peer and self evaluations can be most effectively used by educators to measure student performance in group work.     

The relationship between grit,self-control,and early grade reading: a trial measuring soft skills in rural Tanzania

Abstract

Soft skills such as grit, self-control, and self-confidence have been shown to predict outcomes in school and in life. As such, their valid and reliable measurement is of substantial interest in educational research and policy circles. However, the vast majority of this research originates in Western countries; relatively little is known regarding the measurement of soft skills in developing country contexts and whether similar types of instruments can provide evidence of these skills. This paper presents a novel means of assessing grit, self-control, and self-confidence in rural Tanzania: through the use of scenario-based self-report questionnaires. Survey instruments were administered in three regions in Tanzania to 961 Standard 2 pupils. We found that scenario-based items provided valid and, in most cases, reliable estimates of the three tested soft skills. When comparing self-reported soft skills and reading ability, we found that both grit and self-control were significant predictors of reading and mathematics performance. After controlling for sex, region, and age, grit was found to have a stronger association with reading performance than socioeconomic status.     

What's in a name? A comparison of methods for classifying predominant type of maltreatment

OBJECTIVE: The primary aim of the study was to identify a classification scheme, for determining the predominant type of maltreatment in a child's history that best predicts differences in developmental outcomes. METHOD: Three different predominant type classification schemes were examined in a sample of 519 children with a history of alleged maltreatment. Cases were classified into predominant maltreatment types according to three different schemes: Hierarchical regression analyses examined whether the HT, SFT, and EHT type classifications contributed to prediction of child behavior problems, trauma symptoms and adaptive functioning. RESULTS: After controlling for demographic factors, the HT definitions predicted four outcomes, while the SFT definitions predicted three, and the EHT classifications contributed to the prediction of five child outcomes. The co-occurrence of multiple types of maltreatment was robustly related to outcomes. However, the HT and SFT classifications predicted outcomes even after accounting for the co-occurrence of multiple maltreatment subtypes. CONCLUSION: A classification scheme that differentiates between type combinations and single maltreatment types may have the greatest predictive validity. Over and above knowing about co-occurrence of maltreatment sub-types, it is important to understand what type, or constellation of types, of maltreatment have been alleged in a child's history.     

“Did I mean what I said?” — A reply to McCormick

In this note, I argue that the distinction between what one says and what one means by it is no more problematic (and no less) than the equally important distinction between evidence and theory. Both, I suggest, take a particular form in literate discourse.