Changes in Cortical Sensitivity to Infant Facial Cues From Pregnancy to Motherhood Predict Mother–Infant Bonding     

Joanna Dudek  Tyler Colasante  Antonio Zuffianò  David W. Haley 《Child development》2020,91(1):e198-e217

The transition to motherhood triggers changes in human brain structure that may facilitate mother–infant bonding. Although much research on maternal cortical responses to infant faces has focused on the postpartum period, no previous study has examined whether longitudinal functional changes in the maternal cortex during pregnancy and postpartum are associated with mother–infant bonding. Using electroencephalography, prenatal to postnatal changes in cortical sensitivity (P1, P2, late positive potential, N170 event-related potentials) to infant and adult faces were examined in relation to reported mother–infant bonding in 40 mothers (M_age = 30.5 years). Prenatal to postnatal increases in P1 and P2 responses to infant faces predicted stronger bonding. Findings suggest that cortical changes in attention allocation rather than in face-specific encoding enhance bonding.  相似文献   

Validation of a commercially available inertial measurement unit for recording jump load in youth basketball players     

Lauren C. Benson  Tyler J. Tait  Kimberley Befus  John Choi  Colin Hillson  Carlyn Stilling 《Journal of sports sciences》2020,38(8):928-936

ABSTRACT

A high incidence of overuse knee injuries among youth basketball players may be attributed to number of jumps. Wearable technology may be an effective tool for measuring jump load compared to traditional counting methods. The purpose of this study was to validate a commercially available jump counter (VERT® Classic) in youth basketball practices and games, and to identify the characteristics (i.e., height, direction, takeoff) of jumps recorded by the VERT® Classic. 46 (19F, 27M) youth basketball players wore a VERT® Classic and were recorded on video during games and practices. The number of jumps recorded by the VERT® Classic and evaluated by video raters were compared for each jump characteristic using intraclass correlation coefficient (ICC(3,k)), mean offset, and limits of agreement. The number and percent of VERT® Classic jumps and corresponding video jumps according to timestamp were reported. VERT® Classic jumps had excellent reliability with video-counted jumps over 15 cm (ICC(3,k) = 0.958), with a mean offset of ?2.4 jumps (fewer VERT® Classic) and limits of agreement ?12.6 to 7.8 jumps. Pairs of corresponding jumps represented 68.0% of total video jumps and 92.0% of VERT® Classic jumps. The VERT® Classic can provide an estimate of jump load in youth basketball.  相似文献   

More than Collection Development: Using Local Citation Analysis to Begin a Career in Business Librarianship     

Tyler Martindale 《资料收集管理》2020,45(4):321-334

Abstract

This study shares the results of a citation analysis performed on the publications of the faculty of the College of Business at a large public university in the southern United States for the years 2014–2018. The study examined articles produced by the faculty over the last five years, as well as their cited references and citing articles, in an attempt to establish a list of core journals for business and uncover potential gaps in coverage. Implications for collection development are addressed, as are the benefits for early-career librarians or those unfamiliar with the publishing behaviors of a newly assigned subject discipline.  相似文献   

Kinematic and neuromuscular relationships between lower extremity clinical movement assessments*     

Timothy C. Mauntel  Tyler R. Cram  Barnett S. Frank  Rebecca L. Begalle  Marc F. Norcross  J. Troy Blackburn 《Sports biomechanics / International Society of Biomechanics in Sports》2018,17(2):273-284

Lower extremity injuries have immediate and long-term consequences. Lower extremity movement assessments can assist with identifying individuals at greater injury risk and guide injury prevention interventions. Movement assessments identify similar movement characteristics and evidence suggests large magnitude kinematic relationships exist between movement patterns observed across assessments; however, the magnitude of the relationships for electromyographic (EMG) measures across movement assessments remains largely unknown. This study examined relationships between lower extremity kinematic and EMG measures during jump landings and single leg squats. Lower extremity three-dimensional kinematic and EMG data were sampled from healthy adults (males = 20, females = 20) during the movement assessments. Pearson correlations examined the relationships of the kinematic and EMG measures and paired samples t-tests compared mean kinematic and EMG measures between the assessments. Overall, significant moderate correlations were observed for lower extremity kinematic (r_avg = 0.41, r_range = 0.10–0.61) and EMG (r_avg = 0.47, r_range = 0.32–0.80) measures across assessments. Kinematic and EMG measures were greater during the jump landings. Jump landings and single leg squats place different demands on the body and necessitate different kinematic and EMG patterns, such that these measures are not highly correlated between assessments. Clinicians should, therefore, use multiple assessments to identify aberrant movement and neuromuscular control patterns so that comprehensive interventions can be implemented.  相似文献   

Effect of Mouthguard Use on Metabolic and Cardiorespiratory Responses to Aerobic Exercise in Males     

Michael S. Green  Amanda K. Benson  Tyler D. Martin 《Research quarterly for exercise and sport》2018,89(2):183-189

Purpose: This study investigated the physiological effects of wearing a mouthguard during submaximal treadmill exercise. Method: Twenty-four recreationally active males (M_age = 21.3 ± 2.4 years, M_height = 1.78 ± 0.06 m, M_weight = 81.9 ± 10.6 kg, M_{body mass index} = 25.8 ± 3.4 kg·m^?2) performed incremental, continuous exercise at 2, 4, 6, and 8 mph (3.2, 6.4, 9.7, 12.9 kph) for 5 min at each speed on a motor-driven treadmill on 2 separate occasions in a randomized, crossover, counterbalanced design while wearing or not wearing a self-adaptable “boil and bite” mouthguard. Respiratory rate (RR), tidal volume (V_T), ventilation (V_E), oxygen consumption (VO₂), respiratory exchange ratio (RER), and heart rate (HR) data were averaged during the last 60 s of each exercise stage; blood lactate (LA) was measured before exercise and 3 min and 10 min following exercise. Results: Repeated-measures analysis of variance revealed that mouthguard use failed to alter the response of RR, V_T, V_E, VO₂, RER, and HR to treadmill exercise (p > .05), although each variable did increase in magnitude as a result of increasing treadmill speed (p < .001). Although increasing to above resting values at both 3 min and 10 min (p < .001) after cessation of exercise, LA levels also displayed no differences with mouthguard use (p > .05). Conclusion: Despite predictable increases in respiratory, metabolic, and cardiovascular variables in response to incremental exercise, the presence of a mouthguard failed to affect the magnitude or nature of these physiological responses.  相似文献   

Race,schools and opportunity hoarding: evidence from a post-war American metropolis     

John L. Rury  Aaron Tyler Rife 《History of education》2018,47(1):87-107

Opportunity hoarding is a sociological concept first introduced by Charles Tilly. This article explores its utility for historians by examining efforts to exclude different groups of people in a major American metropolis during the 1960s and seventies. This was a period of significant social change, as the racial composition of big city schools shifted dramatically and suburban school districts grew substantially. An examination two such suburban districts finds sustained and effective measures undertaken to exclude African-Americans from moving into one of them. In the neighbouring district, resistance to low-income housing was initially successful but white residents were unable to prevent relatively affluent blacks from settling there. This eventually contributed to further white flight and the transition to a predominantly African-American district. Mechanisms of exclusion are discussed, along with the utility of opportunity hoarding as a concept for historians interested in studying similar issues in other settings.  相似文献   

E-Mail as Spectroscopy: Automated Discovery of Community Structure within Organizations   总被引：2，自引：0，他引：2  

Joshua R. Tyler  Dennis M. Wilkinson  Bernardo A. Huberman 《The Information Society》2005,21(2):143-153

We describe a method for the automatic identification of communities of practice from e-mail logs within an organization. We use a betweenness centrality algorithm that can rapidly find communities within a graph representing information flows. We apply this algorithm to an initial e-mail corpus of nearly 1 million messages collected over a 2-month span, and show that the method is effective at identifying true communities, both formal and informal, within these scale-free graphs. This approach also enables the identification of leadership roles within the communities. These studies are complemented by a qualitative evaluation of the results in the field.  相似文献   

Child pornography: perpetuating the sexual victimization of children     

R P Tyler  L E Stone 《Child abuse & neglect》1985,9(3):313-318

Children have been sexually exploited throughout recorded history. The invention of the camera and subsequent related technological advances (slides, movies, instant picture cameras and videotape) have provided new avenues for the exploitation of children by facilitating the distribution of pictorial representations of these children on a world-wide basis. A major use of commercial child pornography is to convince a potential child victim that the sexual acts desired by the adult offender are fun, exciting, can satisfy the child's curiosity and are a societally acceptable means of expressing affection. Commercial child pornography publications contain numerous pictures of children viewing child pornography, in some cases replicating the pose(s) depicted in the viewed material. Although many jurisdictions have now prohibited child pornography, the need for a world-wide ban continues, as the remaining producers distribute their material throughout the world.  相似文献   

Do High-Quality Kindergarten and First-Grade Classrooms Mitigate Preschool Fadeout?     

Jade Marcus Jenkins  Tyler W. Watts  Katherine Magnuson  Elizabeth T. Gershoff  Douglas H. Clements  Julie Sarama 《Journal of research on educational effectiveness》2018,11(3):339-374

Prior research shows that short-term effects from preschool may disappear, but little research has considered which environmental conditions might sustain academic advantages from preschool into elementary school. Using secondary data from two preschool experiments, we investigate whether features of elementary schools, particularly advanced content and high-quality instruction in kindergarten and first grade, as well as professional supports to coordinate curricular instruction, reduce fadeout. Across both studies, our measures of instruction did not moderate fadeout. However, results indicated that targeted teacher professional supports substantially mitigated fadeout between kindergarten and first grade but that this was not mediated through classroom quality. Future research should investigate the specific mechanisms through which aligned preschool-elementary school curricular approaches can sustain the benefits of preschool programs for low-income children.  相似文献   

“Really Just Lip Service”: Talking About Diversity in Suburban Schools     

Alison C. Tyler 《Peabody Journal of Education》2016,91(3):289-308

Suburban school districts are in the midst of rapid racial/ethnic and socioeconomic diversification, although the teaching force remains much more homogenous. This article examines how educators in increasingly more diverse suburban schools conceptualize diversity. Qualitative data comes from interviews of 40 teachers, 23 principals and assistant principals, and 16 other school staff in six suburban school districts across the country. Using critical discourse analysis (van Dijk, 1993), I identify three primary discourses: an aspirational commitment to preparing students for a diverse society; color-muteness and insistence on individuality; and a deficit perspective on students from diverse racial/ethnic, linguistic, and socioeconomic backgrounds. In particular, educators perceived cultural deficits in students’ families and communities (Valencia, 2010). Finally, a small number of participants recognized structural forces that impeded the achievement of students of color. The discussion analyzes how such discourses threaten to reproduce educational inequality as suburban districts continue to diversify and concludes with recommendations for districts and schools.  相似文献