The use of adjunct displays to facilitate comprehension of causal relationships in expository text

We examined whether making cause and effect relationships explicit with an adjunct display improves different facets of text comprehension compared to a text only condition. In two experiments, participants read a text and then either studied a causal diagram, studied a list, or reread the text. In both experiments, readers who studied the adjunct displays better recalled the steps in the causal sequences, answered more problem-solving transfer items correctly, and answered more questions about transitive relationships between causes and effects correctly than those who reread the text. These findings supported the causal explication hypothesis, which states that adjunct displays improve comprehension of causal relationships by explicitly representing a text’s causal structure, which helps the reader better comprehend causal relationships.     

Acute short-term sleep deprivation does not affect metacognitive monitoring captured by confidence ratings: a systematic literature review

This article presents the results of a systematic review of the literature surrounding the effects that acute sleep deprivation has on metacognitive monitoring. Metacognitive monitoring refers to the ability to accurately assess one’s own performance and state of knowledge. The mechanism behind this assessment is captured by subjective feelings of confidence concerning the accuracy of our judgments or performance. These judgments influence decision behavior. How well these subjective feelings fit with reality is critical for good decision making. For example, a driver who is overconfident in their ability to remain vigilant after a night without sleep is at risk of having an accident. A learner who is overconfident in their ability to perform well on an exam without sleep is at risk of failing. A break down in metacognitive monitoring might be responsible for the increase in poor decision making observed when people are sleep deprived. Using defined search terms and exclusion criteria, electronic database searches identified ten empirical studies suitable for review. Participants in these studies completed performance-based tasks, typically cognitive, while remaining awake for 28–63 hours. In all studies, metacognitive monitoring was assessed via confidence ratings either pre-, on-, or post-task. Extended wakefulness had a significant negative effect on performance in most studies. Evidencing good monitoring, however, the monitoring estimates such as confidence also tended to decline. Moreover, two critical variables that assess the fit of these estimates to actual performance (bias and discrimination) were mostly unaffected by the number of hours awake. Still, some results indicated that these variables may be affected by substances intended to fight sleep deprivation, such as modafinil. Within the limitations of extant literature (e.g., a sampling bias towards young adult male participants), empirical observations to date converge to suggest that metacognitive monitoring remains largely unaffected by the examined quantities of acute sleep deprivation (up to 63 hours).     

Examining emotional expressions in discourse: methodological considerations

This methodological paper presents an approach for examining emotional expressions through discourse analysis and ethnographic methods. Drawing on trends in the current literature in science education, we briefly explain the importance of emotions in science education and examine the current research methodologies used in interactional emotion studies. We put forth and substantiate a methodological approach that attends to the interactional, contextual, intertextual, and consequential aspects of emotional expressions. By examining emotional expressions in the discourse in which they are constructed, emotional expressions are identified through semantics, contextualization, and linguistic features. These features make salient four dimensions of emotional expressions: aboutness, frequency, type, and ownership. Drawing on data from a large empirical study of pre-service elementary teachers’ emotional expressions about climate change in a science course, we provide illustrative examples to describe what counts as emotional expressions in situ. In doing so we explain how our approach makes salient the nuanced nature of such expressions as well as the broader discourse in which they are constructed and the implications for researching emotional expressions in science education discourse. We suggest reasons why this discourse orientated research methodology can contribute to the interactional study of emotions in science education contexts.     

‘Snapchat’, youth subjectivities and sexuality: disappearing media and the discourse of youth innocence

Research on youth subjectivities and disappearing media is still in its infancy. Ephemeral technologies such as Snapchat, Frankly and Wickr offer young people opportunities for discursive agency, harnessing teenage discourses of social positioning. These media facilitate social mobility in teen peer contexts by providing a medium for dynamic and shifting relationships. The transmission of digital images can enable a social flexibility that has a significant impact on youth subjectivities where discursively constructed relational identities are brokered through cyber technologies. We tackle the question ‘what discourses are evoked and produced in the discussion of disappearing social media?’ by exploring two parents’ accounts of their children’s use of this media. We also examine a discourse of innocence that surrounds teens’ use of social media and, in particular, ephemeral applications, by sexting and cyberbullying. We engage in the debate on the use of ephemeral social media to consider the discourses influencing youth subjectivities and the nature of networked publics.     

Metacognitive ability from a theory-of-mind perspective: a cross-cultural study of students with and without hearing loss

Theory of Mind (see, e.g., Bartsch & Estes, 1996) is a concept that can help educators understand how students think about their state of mind and that of others involved in various life situations. To examine the impact of culture and the impact of hearing loss on metacognition as explained by Theory of Mind, two samples of students with and without hearing losses who were from two different cultures were compared on their ability to choose pictures representing their perspectives on specific life situations. The two groups did not differ in their metacognitive interpretations of the experiences when they were from the same culture, although students from different cultures did differ, indicating that culture may have a greater impact on metacognition as explained by Theory of Mind than hearing loss. Data collected in the present study affirmed previous research showing that students with hearing losses could make metacognitive decisions about life situations just as ably as their hearing peers from the same culture.     

Implicit beliefs of ability and maladaptive learning: does self-efficacy matter?

This study investigated the interaction between self-efficacy and implicit beliefs of ability in their association with maladaptive learning in mathematics. The analysis was based on a large sample of 2538 Singapore Secondary 2 students (M_age = 13.75), who took measures of entity beliefs of ability, self-efficacy, and three maladaptive learning variables in mathematics: novelty avoidance, cheating, and anxiety. We conducted latent interaction analysis with gender and previous mathematics achievement controlled and found that higher self-efficacy did not buffer, but enhanced the positive association between entity beliefs of ability and the three maladaptive learning variables. When entity beliefs of ability were higher, the increase in the three maladaptive learning was larger for those with higher self-efficacy than those with lower self-efficacy. Findings suggest a revision of the moderation hypothesis in the literature: higher self-efficacy is more helpful in preventing maladaptive learning for incremental theorists than for entity theorists.     

The influences of integrating reading,peer evaluation,and discussion on undergraduate students’ scientific writing

Scientific writing is related to the practice of communicating scientific knowledge. This study treats scientific writing as a social practice, taking as its premise the notion that participating in related activities such as reading, peer evaluation, and discussion would positively affect the competence of students’ scientific writing, by developing their epistemic cognition regarding scientific knowledge communication and legitimation. An empirical study was conducted with twenty-two Chinese undergraduate students to test this premise. These students were majoring in chemistry and undertook a researcher-designed intervention course (Advanced Organic Chemistry Experiment), which embodied the integrated strategy of reading, peer evaluation, and discussion on scientific writing. Based on data pertaining to those students’ performance in terms of the normativity, objectivity, and logicality of scientific writing drawn from a previous study by the current author (Deng, Kelly, & Xiao, 2019. The development of Chinese undergraduate students’ competence of scientific writing in the context of advanced organic chemistry experiment course. Chemistry Education Research and Practice, 20, 270–287), alongside data drawn from students’ written texts in reading reflections and on-line discourse related to peer evaluation and discussion, this study claimed that the tasks of reading, peer evaluation, and discussion were seen gradually to lead to the development of Chinese undergraduate students’ greater competence in scientific writing regarding the synthetic experiments of organic chemistry.     

Insulator-based dielectrophoresis of mitochondria

Isolated mitochondria display a wide range of sizes plausibly resulting from the coexistence of subpopulations, some of which may be associated with disease or aging. Strategies to separate subpopulations are needed to study the importance of these organelles in cellular functions. Here, insulator-based dielectrophoresis (iDEP) was exploited to provide a new dimension of organelle separation. The dielectrophoretic properties of isolated Fischer 344 (F344) rat semimembranosus muscle mitochondria and C57BL/6 mouse hepatic mitochondria in low conductivity buffer (0.025–0.030 S/m) at physiological pH (7.2–7.4) were studied using polydimethylsiloxane (PDMS) microfluidic devices. First, direct current (DC) and alternating current (AC) of 0–50 kHz with potentials of 0–3000 V applied over a channel length of 1 cm were separately employed to generate inhomogeneous electric fields and establish that mitochondria exhibit negative DEP (nDEP). DEP trapping potential thresholds at 0–50 kHz were also determined to be weakly dependent on applied frequency and were generally above 200 V. Second, we demonstrated a separation scheme using DC potentials <100 V to perform the first size-based iDEP sorting of mitochondria. Samples of isolated mitochondria with heterogeneous sizes (150 nm–2 μm diameters) were successfully separated into sub-micron fractions, indicating the ability to isolate mitochondria into populations based on their size.     

The Impact of After-School Peer Contact on Early Adolescent Externalizing Problems Is Moderated by Parental Monitoring, Perceived Neighborhood Safety, and Prior Adjustment

Unsupervised peer contact in the after-school hours was examined as a risk factor in the development of externalizing problems in a longitudinal sample of early adolescents. Parental monitoring, neighborhood safety, and adolescents' preexisting behavioral problems were considered as possible moderators of the risk relation. Interviews with mothers provided information on monitoring, neighborhood safety, and demographics. Early adolescent (ages 12-13 years) after-school time use was assessed via a telephone interview in grade 6 (N = 438); amount of time spent with peers when no adult was present was tabulated. Teacher ratings of externalizing behavior problems were collected in grades 6 and 7. Unsupervised peer contact, lack of neighborhood safety, and low monitoring incrementally predicted grade 7 externalizing problems, after controlling for family background factors and grade 6 problems. The greatest risk was for those unsupervised adolescents living in low-monitoring homes and comparatively unsafe neighborhoods. The significant relation between unsupervised peer contact and problem behavior in grade 7 held only for those adolescents who already were high in problem behavior in grade 6. These findings point to the need to consider individual, family, and neighborhood factors in evaluating risks associated with young adolescents' after-school care experiences.