Time needed to change the isometric force production of a response

This study investigated the time needed to change a motor program that specified the elbow flexor muscles to gradually increase the isometric force production from 15% to 75% of one's maximum voluntary contraction (MVC). A double-stimulation paradigm was used with the restriction that subjects (N = 12) be at 15% of their MVC before the presentation of the first stimulus. Subjects reacted to the first stimulus (randomly presented) by gradually increasing their isometric force from 15% to 75% of their MVC and then reacted to the second stimulus by altering the force production in one of four ways: (a) increasing the force to the 75% level rapidly instead of gradually, (b) discontinuing the increase and maintaining the level of force attained, (c) discontinuing all force production, or (d) reversing the direction of force so that it is produced by the elbow extensors. The data revealed that more time was needed to increase the force rapidly than to perform any of the other three conditions.     

Effects of anonymity and retaliatory potential on student evaluations of faculty performance

The present study, employing a 2×2 design, examines the independent and interactive effects of two experimentally manipulated variables, Anonymity (A) and Retaliatory Potential (RP), on students' ratings of faculty performance. Data were obtained from 188 students at a large midwestern university using an instrument that had been specially developed for the study. A hypothesized main effect was found for A: The professor was rated more positively by students completing signed ratings than those completing ratings anonymously. The data showed no support, however, for the hypothesized RP main effect or the A×RP interactive effect. Practical implications of the study's findings are discussed.     

Word Spotting in Bitmapped Fax Documents

Images and signals may be represented by forms invariant to time shifts, spatial shifts, frequency shifts, and scale changes. Advances in time-frequency analysis and scale transform techniques have made this possible. However, factors such as noise contamination and style differences complicate this. An example is found in text, where letters and words may vary in size and position. Examples of complicating variations include the font used, corruption during facsimile (fax) transmission, and printer characteristics. The solution advanced in this paper is to cast the desired invariants into separate subspaces for each extraneous factor or group of factors. The first goal is to have minimal overlap between these subspaces and the second goal is to be able to identify each subspace accurately. Concepts borrowed from high-resolution spectral analysis, but adapted uniquely to this problem have been found to be useful in this context. Once the pertinent subspace is identified, the recognition of a particular invariant form within this subspace is relatively simple using well-known singular value decomposition (SVD) techniques. The basic elements of the approach can be applied to a variety of pattern recognition problems. The specific application covered in this paper is word spotting in bitmapped fax documents.     

Hand/wrist disorders among sign language communicators

The study assessed the frequency of self-reported hand/wrist problems among sign language communicators, including interpreters, deaf or hard-of-hearing individuals, and educators. Comparisons were also made between sign language communicators and the general population regarding the frequency of medically diagnosed carpal tunnel syndrome. A survey was mailed to attendees of a national conference that focused on the quality of postsecondary educational opportunities for students with hearing deficits. Fifty-nine percent of 184 respondents reported experiencing hand/wrist problems. Twenty-six percent reported experiencing hand/wrist problems severe enough to limit the ability to work, and 18% reported a medical diagnosis of wrist tendinitis, carpal tunnel syndrome, or both. The frequency of self-reported, medically diagnosed carpal tunnel syndrome for the surveyed sign language communicators was five times the rate experienced by working Americans between ages 18 and 60 years (Tanaka, Wild, Seigman, Halperin, Behrens, & Putz-Anderson, 1995). The study supports increased emphasis on and availability of hand/wrist disorder risk reduction programs for sign language users.     

History-dependent percolation on multiplex networks

The structure of interconnected systems and its impact on the system dynamics is a much-studied cross-disciplinary topic. Although various critical phenomena have been found in different models, study of the connections between different percolation transitions is still lacking. Here we propose a unified framework to study the origins of the discontinuous transitions of the percolation process on interacting networks. The model evolves in generations with the result of the present percolation depending on the previous state, and thus is history-dependent. Both theoretical analysis and Monte Carlo simulations reveal that the nature of the transition remains the same at finite generations but exhibits an abrupt change for the infinite generation. We use brain functional correlation and morphological similarity data to show that our model also provides a general method to explore the network structure and can contribute to many practical applications, such as detecting the abnormal structures of human brain networks.     

The importance of mature,part-time students to higher education in the U.K.

This paper assesses the contribution made by mature part-time students to the statistics on higher education. It shows that part-time numbers currently account for approximately 40% of total student numbers in the UK, 33% of university students, (mostly in the Open University) and 43% of the total in polytechnics and colleges, (1989–90 figures). The majority are mature people, over 25 years of age, who combine both education and employment. The principal change over the past ten years has been the increasing proportion of women, who now form more than 44% of the total number of students and 42% of the part-time total. A theoretical analysis is carried out, using the Human Capital model, which shows that part-time higher education might produce significant rates of return, both to the individual and society. It is noted that most of the research efforts in the UK, into the benefits of higher education, have concentrated on young, 18–21 year olds, who study full-time, and that current government policy is primarily concerned with improving the participation rate of this age group. This paper concludes that there is sufficient evidence to warrant a more thorough investigation of the costs and benefits of part-time study and suggests that there is considerable potential for expansion in this area.     

Processes of Early Childhood Interventions to Adult Well‐Being

This article describes the contributions of cognitive–scholastic advantage, family support behavior, and school quality and support as processes through which early childhood interventions promote well‐being. Evidence in support of these processes is from longitudinal cohort studies of the Child–Parent Centers and other preventive interventions beginning by age 4. Relatively large effects of participation have been documented for school readiness skills at age 5, parent involvement, K‐12 achievement, remedial education, educational attainment, and crime prevention. The three processes account for up to half of the program impacts on well‐being. They also help to explain the positive economic returns of many effective programs. The generalizability of these processes is supported by a sizable knowledge base, including a scale up of the Child–Parent Centers.     

Nurturing Nature: How Brain Development Is Inherently Social and Emotional,and What This Means for Education

New advances in neurobiology are revealing that brain development and the learning it enables are directly dependent on social-emotional experience. Growing bodies of research reveal the importance of socially triggered epigenetic contributions to brain development and brain network configuration, with implications for social-emotional functioning, cognition, motivation, and learning. Brain development is also impacted by health-related and physical developmental factors, such as sleep, toxin exposure, and puberty, which in turn influence social-emotional functioning and cognition. An appreciation of the dynamic interdependencies of social-emotional experience, health-related factors, brain development and learning underscores the importance of a “whole child” approach to education reform and leads to important insights for research on social-emotional learning. To facilitate these interdisciplinary conversations, here we conceptualize within a developmental framework current evidence on the fundamental and ubiquitous biological constraints and affordances undergirding social-emotional learning–related constructs and learning more broadly. Learning indeed depends on how nature is nurtured.