It may not be that difficult the second time around: the effects of rereading on the comprehension and metacomprehension of negated text

The present research explored the awareness that readers have of the difficulty of negative text and aimed to determine whether rereading could impact comprehension and metacomprehension. Participants read passages that sometimes contained negative words such as ‘no’ and ‘not’, rated their comprehension, and answered a comprehension question about the passage. Half of the passages were read twice and rated again before the participant was prompted to answer a comprehension question. Results showed that passages that were read twice were rated as easier to understand, and questions that corresponded with those passages were answered with higher accuracy as well. However, these improvements were not exclusive to negated passages. And, while participants were aware that the negative passages were harder to comprehend, this understanding did not aid in heightened comprehension of the negative text. Rereading was demonstrated to be a helpful strategy overall but was not sufficient to specifically help with negation.     

The evolution of FM radio: 1941–1946

The following verbatim extracts from FCC Annual, Reports are part of a continuing series published in the Journal of Broadcasting that includes: “The Evolution of Television: 1927–1943” (Summer, 1960); “The Evolution of Television: 1944–1948” (Winter, 1960–61); and “The Evolution of FM Radio: 1935–1940” (Spring, 1961).     

浅谈抒情诗的含蓄

含蓄是含有深意、藏而不露,也就是不把意思明白地说出来,含在所写的形象里,下面举几首诗来看看艺术的含蓄。     

Advancements in instructional design theory: Contextual module analysis and integrated instructional strategies

In the past decade, research and theoretical advancements in both cognitive science and instructional technology have led to updates in instructional design theory. In this article, we review two areas in which the updates make important contributions: information analysis for higher-order cognition, and instructional strategies to improve acquisition of such higher-order processes. From our reviews of the literature, we propose procedures for conducting a contextual module analysis and designing integrated instructional strategies. An additional purpose of the article is to demonstrate the need for researchers in educational technology to lead in the discovery of theories contributing to acquisition of higher-order cognition.     

Sherlock Holmes: scientific detective

Sherlock Holmes was intended by his creator, Arthur Conan Doyle, to be a 'scientific detective'. Conan Doyle criticized his predecessor Edgar Allan Poe for giving his creation - Inspector Dupin - only the 'illusion' of scientific method. Conan Doyle believed that he had succeeded where Poe had failed; thus, he has Watson remark that Holmes has 'brought detection as near an exact science as it will ever be brought into the world.' By examining Holmes' methods, it becomes clear that Conan Doyle modelled them on certain images of science that were popular in mid- to late-19th century Britain. Contrary to a common view, it is also evident that rather than being responsible for the invention of forensic science, the creation of Holmes was influenced by the early development of it.     

A case study in defining literacy: David Olson's journey from the Great Divide to the Great Beyond

David Olson writes his reply to Snyder in this issue ofInterchange. See page 56.     

The Development and Validation of the Perceived Academic Underachievement Scale

Academic competence beliefs have been widely studied. However, conceptual and measurement efforts have not yet been directed toward understanding perceived underachievement (feeling that one's accomplishments fall below perceived capability). We conducted two studies in order to develop and examine validity evidence for the Perceived Academic Underachievement Scale (PAUS). Participants were individuals enrolled for credit in at least one post-secondary course. In Study 1, we evaluated content validity and conducted an exploratory factor analysis. In Study 2, we conducted a confirmatory factor analysis and investigated external validity. For both samples, PAUS demonstrated good internal consistency reliability, and items loaded strongly onto a single factor. PAUS was empirically distinct from a range of related constructs. Findings represent preliminary validation evidence.     

Implementation of the Peer-Led Team-Learning Instructional Model as a Stopgap Measure Improves Student Achievement for Students Opting Out of Laboratory

In entry-level university courses in science, technology, engineering, and mathematics fields, students participating in associated laboratory sessions generally do better than those who have no related lab classes. This is a problem when, for various reasons, not enough lab sections can be offered for students and/or when students opt out of optional available lab courses. Faced with such a situation, this study evaluated the efficacy of the peer-led team-learning (PLTL) instructional model as a potential method for narrowing the achievement gap among undergraduate students electing not to enroll in an optional laboratory component of an introductory biology course. In peer-led workshops, small groups of students participated in solving problems and other activities that encouraged active learning. Students led by peer leaders attained significantly higher exam and final course grades in introductory biology than comparable students not participating in PLTL. Among the introductory biology students who opted not to enroll in the optional lab course, those who participated in PLTL averaged more than a letter grade higher than those who did not. This difference was statistically significant, and the PLTL workshops almost entirely closed the achievement gap in lecture exam and final grades for students who did not take the lab.     

Index of mechanical efficiency in competitive and recreational long distance runners

The purpose of this investigation was to compare external work and net energy expenditure during a bout of repetitive stretch-shortening cycles between competitive and recreational long-distance runners. Participants were divided into either competitive or recreational runners based on their maximal oxygen consumption and self-reported 1600 m times. The stretch-shortening cycle involved a repetitive hopping protocol on a force plate while measuring oxygen consumption and lactate accumulation for a total of 10 min. External work and net energy expenditure were calculated for 3 min after steady state was achieved and the ratio between these variables was utilised as an index of mechanical efficiency. Lower extremity stiffness was calculated during this interval as well. Net energy expenditure was significantly lower in competitive runners (152.6 ± 33.3 kJ) in comparison to recreational runners (200.6 ± 41.4 kJ) (P = 0.02) given similar amounts of external work performed in both groups (competitive runners = 65.6 ± 20.1 kJ, recreational runners = 68.8 ± 12.1 kJ) (P = 0.67). Index of mechanical efficiency was significantly different between competitive runners (43.2 ± 9.0%) and recreational runners (34.8 ± 5.3%) (P = 0.03). No significant differences were found in lower extremity stiffness (P = 0.64). Competitive distance runners can perform similar levels of external work with lower net energy expenditure and thus a higher index of mechanical efficiency during repetitive stretch-shortening cycles in comparison to recreational runners with similar values of lower extremity stiffness. This ability could possibly be due differences in muscle–tendon length changes, muscle pre-activation, cross-bridge potentiation and short-latency reflex responses as a result of training which should be considered for future investigation.