Explicit and implicit confidence judgments and developmental differences in metamemory: an eye-tracking approach

In the present study, primary school children's ability to give accurate confidence judgments (CJ) was addressed, with a special focus on uncertainty monitoring. In order to investigate the effects of memory retrieval processes on monitoring judgments, item difficulty in a vocabulary learning task (Japanese symbols) was manipulated. Moreover, as a first exploratory step to uncover fast and retrieval bound (implicit) monitoring processes that take place before explicit CJ are openly reported, fixation time allocation during recognition and monitoring was recorded with an eye-tracking device. Results revealed developmental progression in uncertainty (but not in certainty) monitoring between the age of 7 and 9years. Differences in CJ across levels of item difficulty point to a substantial impact of retrieval processes on 9-yr-olds' but not on 7-yr-olds' monitoring. Eye-tracking data revealed an overall bias towards medium and high CJ, and confirmed evidence on developmental progression in monitoring skill

Estimación de Logro Infantil en Pruebas de Matemáticas y Ciencias Naturales a lo largo de un Curso. Un Estudio Piloto.

Abstract Introduction. The metacognitve ability to accurately estimate ones performance in a test, is assumed to be of central importance for initializing task-oriented effort. In addition activating adequate problem-solving strategies, and engaging in efficient error detection and correction. Although school children’s’ ability to estimate their own performance has been widely inves-tigated, this was mostly done under highly-controlled, experimental set-ups including only one single test occasion. Method. The aim of this study was to investigate this metacognitive ability in the context of real achievement tests in mathematics. Developed and applied by a teacher of a 5th grade class over the course of a school year these tests allowed the exploration of the variability of performance estimation accuracy as a function of test difficulty. Results. Mean performance estimations were generally close to actual performance with somewhat less variability compared to test performance. When grouping the children into three achievement levels, results revealed higher accuracy of performance estimations in the high achievers compared to the low and average achievers. In order to explore the generaliza-tion of these findings, analyses were also conducted for the same children’s tests in their sci-ence classes revealing a very similar pattern of results compared to the domain of mathemat-ics. Discussion and Conclusion. By and large, the present study, in a natural environment, con-firmed previous laboratory findings but also offered additional insights into the generalisation and the test dependency of students’ performances estimations. Keywords: metacognition, primary school, performance estimation, mathematics, scienc

The contribution of interference control for young children`s working memory performance: Insights from eye-tracking

In the present study, the role of visual attentional processes for working memory performance in a sample of 6-year-olds was investigated. This was done by combining an individual differences approach with an experimental manipulation: For the individual differences approach, participants were grouped based on their performance in a classical interference control task, and their working memory skills were systematically compared. For the experimental manipulation, the need to control interference while performing a working memory task was increased in one condition through presentation of distracting stimuli. In a between-subject design performance in this condition was contrasted with a control condition without distractors. Additionally, fixation time during stimuli presentation were quantified by tracking participants` gazes. Results revealed that children with higher interference control skills showed superior working memory performance. Increasing the need to inhibit attention towards task-irrelevant information through presentation of distractors decreased working memory performance. The present study offers supporting evidence for a close relationship between young children`s working memory and attention

Early results in the treatment of proximal humeral fractures with a polyaxial locking plate

Objectives: We report early results using a second generation locking plate, non-contact bridging plate (NCB PH®, Zimmer Inc. Warsaw, IN, USA), for the treatment of proximal humeral fractures. The NCB PH® combines conventional plating technique with polyaxial screw placement and angular stability. Design: Prospective case series. Setting: A single level-1 trauma center. Patients: A total of 50 patients with proximal humeral fractures were treated from May 2004 to December 2005. Intervention: Surgery was performed in open technique in all cases. Main outcome measures: Implant-related complications, clinical parameters (duration of surgery, range of motion, Constant-Murley Score, subjective patient satisfaction, complications) and radiographic evaluation [union, implant loosening, implant-related complications and avascular necrosis (AVN) of the humeral head] at 6, 12 and 24weeks. Results: All fractures available to follow-up (48 of 50) went to union within the follow-up period of 6months. One patient was lost to follow-up, one patient died of a cause unrelated to the trauma, four patients developed AVN with cutout, one patient had implant loosening, three patients experienced cutout and one patient had an axillary nerve lesion (onset unknown). The average age- and gender-related Constant Score (n=35) was 76. Conclusions: The NCB PH® combines conventional plating technique with polyaxial screw placement and angular stability. Although the complication rate was 19%, with a reoperation rate of 12%, the early results show that the NCB PH® is a safe implant for the treatment of proximal humeral fracture

Lorentz angle measurements in irradiated silicon detectors between 77 K and 300 K

Future experiments are using silicon detectors in a high radiation environment and in high magnetic fields. The radiation tolerance of silicon improves by cooling it to temperatures below 180 K. At low temperatures the mobility increases, which leads to larger deflections of the charge carriers by the Lorentz force. A good knowledge of the Lorentz angle is needed for design and operation of silicon detectors. We present measurements of the Lorentz angle between 77 K and 300 K before and after irradiation with a primary beam of 21 MeV protons.Comment: 13 pages, 9 figures, submitted to ICHEP2000, Osaka, Japa

Developmental changes in the engagement of episodic retrieval processes and their relationship with working memory during the period of middle childhood.

We examined the development of children’s engagement of the episodic retrieval processes of recollection and familiarity and their relationship with working memory (WM). Ninety-six children (24 in four groups aged 8, 9, 10, and 11 years) and 24 adults performed an episodic memory (EM) task involving old/new, remember/know (R/K), and source memory judgements and numerous WM tasks that assessed verbal and spatial components of WM and delayed short-term memory (STM). Developmental changes were observed in EM with younger children (8-, 9-, 10-year-olds) making fewer remember responses than 11-year-olds and adults while 11-year-olds did not differ from adults. Only children aged 10 years plus showed a relationship between EM and WM. EM was related to verbal executive WM in 10- and 11-year-old children suggesting that children at this stage use verbal strategies to aid EM. In contrast, EM was related to spatial executive WM in adults. The engagement of episodic retrieval processes appears to be selectively related to executive components of verbal and spatial WM, the pattern of which differs in children and adults

An Evening of Drama: A Solo and Duo Concert with Jessica and Gabriella Roderer

Solo and duo concert held with pianist Jessica Roderer and flutist Gabriella Roderer.https://digitalcommons.usu.edu/music_programs/1091/thumbnail.jp

Evolutionary Cycles for Pericyclic Reactions – Or Why We Keep Mutating Mutases

Directed evolution strategies are being applied ever more frequently to develop novel and improved enzymes for many applications, including those contributing to 'white biotechnology'. In addition to engineering new biocatalysts, evolutionary strategies are equally suited to the elucidation of enzyme structure and function. Here, we illustrate with selected examples from our own work on chorismate mutases how such strategies can be employed to address a range of fundamental questions. Over the last decade, this model system, which was once considered to be a 'very simple' enzyme from the shikimate pathway, has afforded many – sometimes surprising – discoveries about biocatalysis. It has also taught us how to upgrade evolutionary approaches to overcome technical hurdles. Both the new insights and the methodological improvements should enhance our ability to tailor enzymes for novel uses

Scholarly communications program: force for change

The changing landscape of scholarly publication and increasing journal costs have resulted in a need for proactive behavior in libraries. At Johns Hopkins University in Baltimore, Maryland, a group of librarians joined forces to bring these issues to the attention of faculty and to begin a dialog leading to change. This commentary describes a comprehensive program undertaken to raise faculty awareness of scholarly communications issues. In addition to raising faculty interest in the issues at hand, the endeavor also highlights an area where library liaisons can increase their communication with the units they serve