Expertise Guidance Research Articles

7341 Establishing a Multidisciplinary Care Program for patients with Klinefelter Syndrome and other Aneuploidy X and Y Variations

Abstract Disclosure: C.J. Romero: None. N.R. Malhotra: None. A. Norris-Brilliant: None. C. Mintz: None. Objectives: Klinefelter syndrome (KS) is one of the most common genetic aneuploidies denoted by a XXY karyotype and affects up to 1 in 600 patients. Most patients are not diagnosed until adolescent years or adulthood. KS is one of the leading causes of male infertility and testosterone insufficiency. KS is also associated with developmental delays, particularly speech and language delay. Advances in genetics screenings has led to early identification of KS and other aneuploidy X and Y variations, access to neurodevelopmental screening and fertility preservation resources during adolescence and young adulthood. We believe a multidisciplinary program for KS can provide the necessary resources for patients and families at any age from infancy to young adulthood. Methods: A group of faculty from the divisions of pediatric endocrinology, genetics, urology and psychiatry assembled in 2023 to establish a multidisciplinary clinic (MDC) to provide comprehensive care to patients/parents; this ranged from prenatal diagnosis to young adulthood. Two major challenges of care are access to neuro-psychological evaluations and fertility preservation options. Testosterone supplementation requires appropriate referral to endocrinology and timing of treatment remains controversial. Our goals include: expertise guidance and planning after prenatal diagnosis or later in age; access to cost effective neuro-psychological testing during early childhood years; urological consultation beginning in early puberty to educate and prepare patients for choices of surgical and non-surgical options of fertility preservation. Results: Our current center cares for 12 patents ranging from ages 3 months to 21 years. Of this cohort, 3 (25%) of the patients had initial consultations with the parents during pregnancy. 7 (58%) of the patients were of pubertal age that one would consider testosterone replacement, but only 3 (43%) were taking testosterone. Only 1 patient of school age reported neuro-psychological evaluation that was completed at a different institution. No patients received testosterone supplementation during year one of life. Conclusions: A multidisciplinary team can offer simultaneous assessment, anticipatory guidance and management for KS patients and their families. It is a comprehensive resource to our community. Prenatal genetic screenings bring awareness to this diagnosis and therefore timely education toward understanding the lifelong management of KS. Identifying developmental delays early in childhood will help with scholastic success. Monitoring of pubertal development will ensure appropriate pubertal progression in addition to education and management of fertility preservation. Undoubtedly future urological advances will assist patients more effectively. We believe our model provides the access to resources that allow our patients and family to successfully thrive. Presentation: 6/2/2024

Model of activity of Mayor Aleksey Sokolov and agents stormtroopers under his leadership

In the public narrative on partisan warfare, an extremely important role is played by agents stormtroopers under Mayor Aleksey Sokolov leadership. Many have heard that this person was “the leader of all-Ukrainian agents stormtroopers”, who was sent to Lithuania to organize the activity of agents stormtroopers. Yet, the information known about this person has been scarce so far. By this article it is sought to provide some facts on the biography of A. Sokolov and highlight the principles of activity of special groups under his leadership. A. Sokolov was a specialist in the specific agency-operational area. He was a recipient of various insignia and other honorary awards, which demonstrated appreciation of his activity by the All-Russian Extraordinary Commission (Cheka) authorities. On the other hand, legality of methods used by A. Sokolov and stormtroopers under his leadership raised doubts. It is likely that namely this problem prevented him from awarding the title of the Hero of the Soviet Union. It took to A. Sokolov less than one year of working with the special group in order to create a model of stormtroopers usage adapted to fighting the Ukrainian partisans. In doing this, A. Sokolov consulted the stormtroopers themselves. While being on secondment in Lithuania, he reformed the special group of the Ministry of Internal Affairs (MVD) of Lithuanian Soviet Socialist Republic (LSSR) according to the Ukrainian model. The operation that took place in Grendavė village of Onuškis Rural District in Trakai County was in line with the model of operations carried out in Ukraine: on the basis of operational data, a legend had been created, a list of persons to be detained and interrogated compiled, the stormtroopers, dressed and equipped as the Red Army soldiers, prepared bunkers for future interrogations, wrote minutes containing evidence of the persons detained, etc. A. Sokolov’s expertise and methodical guidance laid the foundation for practical activity of special groups in Lithuania. Further on, the stormtroopers actually employed the tactics, created by A. Sokolov.

Shedding light on the preconditions for circular economy: Evidence from SMEs in the agri-food sector

Shedding light on the preconditions for circular economy: Evidence from SMEs in the agri-food sector

Transdisciplinary assessment frame as leverage for integrated care

In patients with severe, complex, and long-lasting psychiatric problems, psychopathology becomes intrinsically intertwined with personality, biological, social, and existential well-being. Consequently, the share of experience of general well-being becomes more critical. Therefore, apart from standard evidence-based treatment, added guidelines and good practices concerning suicidality, lifestyle, family impact and resource, human custodial measures, collaboration with patients and their expertise, and spiritual and existential guidance, complement standard guidelines. Unfortunately, these extra guidelines are used only as an add-on with traditional treatments or separated in a recovery approach where treatment would no longer be the focus. Because of the lasting need for integrated and precision care in these patients, UPC Duffel Belgium started an integrated plan for precision care. The first step in this plan was the development of a three-level assessment frame, a 'general treatment' backbone as leverage for uniting the different specializations, and a frame in which all interdisciplinary and transdisciplinary activities find their place. The next step is the collaborative use of the system and implementation of the associated skills and attitudes for all participants.
 The first person-centered level is the individual psychotherapeutic level at which criteria for treatment indication are evaluated in an overview that prioritizes with the patients’ different problems, systematically organized in four axes. Axis I, of distant fixed factors of nature and nurture is associated with the latent intrapersonal or permanent contextual or cultural factors (Axis II). The outcome behavior Axis III shows problem behaviors as a flip side of their associated therapeutic goals, followed by Axis IV with direct behavior-triggering and factual temporary, environmental, and relational/contextual factors. This case conceptualization is feasibly visualized and translated into a short explanation and hope inspiring narrative with the patient. 
 The second interdisciplinary level is the team level, at which treatment criteria are evaluated in the context of the treatment history. The staff and the patient check ten points: identification of the patient, triggering events for admission, previous treatments with successes and failures, important influences of personality, contextual or cultural factors as far as conditional for the present treatment, preferences of the patient, short term risks, long term risks, treatment priorities, ultimate goal and deselected treatment targets, criteria for dismission and contextual points of attention. Experience experts coach patients, using these points as a guide, to emancipate these patients to equality and to informed negotiator in their treatment, thus obliging the teams to prepare for a transparent discussion. 
 The third transdisciplinary level is the hospital level which automatically and repeatedly evaluates the stay's effect by Routine Outcome Monitoring in all domains of functioning as in the International Classification of Functioning model (ICF). This model provides an overview of functioning, activity, and participation problems and resources and indicates the right places for engaging in transdisciplinary actions and collaboration beyond the restricted cure field of psychiatry. The functioning chart is a hinge that connects the psychopathology frame and the complementary positive health domains as both map on the same ICF scheme.

412 Utility of a Team Science and Project Management Approach to Providing Effective Participant Recruitment Support to Research Teams: The Indiana CTSI Recruitment Concierge Service (RCS)

OBJECTIVES/GOALS: Evaluate effectiveness of participant recruitment service to improve study enrollment through customer feedback surveys and recruitment data obtained by research teams utilizing services. Use survey information to conduct gap analysis of additional support needed for participant recruitment. METHODS/STUDY POPULATION: Participant enrollment is often cited as one of the most challenging aspects of clinical research. In 2021, the Indiana CTSI used project management techniques to design and pilot a Team Science approach for providing participant recruitment support to clinical research teams. This service called the Indiana CTSI Recruitment Concierge Service (RCS) is comprised of recruitment, community engagement, social media, communications, and project management expertise. Additional experts are chosen to participate based on the study needs (regulatory, population insight, informatics, clinical services, etc.) RCS customers are comprised of study teams from a variety of areas and research experience. These customers are sent surveys to evaluate the support they received and provide suggestions for improvement. RESULTS/ANTICIPATED RESULTS: The RCS assisted 72 study teams in 2021 and 85 (as of November) in 2022. These studies were referred via word of mouth as no advertising of the service had been done to date. All customers were provided a study specific consultation with recommendations of services and resources that would assist their study. Some services recommended were: local study listing and volunteer registry (All IN for Health), digital marketing support, materials design expertise, community engagement and healthcare patient recruitment guidance. The overall feedback from RCS customers has been positive with most teams indicating the support improved their study recruitment and/or engagement plan. RCS will use information obtained to develop a strategy for prioritizing services due to the overwhelming number of requests received. DISCUSSION/SIGNIFICANCE: Using project management techniques and a Team Science approach, the Indiana CTSI was able to develop a comprehensive participant recruitment service that integrates clinical research operations, community engagement, and informatics expertise to design study specific recruitment plans and coordination of services.

How Can IJDS Authors, Reviewers, and Editors Use (and Misuse) Generative AI?

How Can <i>IJDS</i> Authors, Reviewers, and Editors Use (and Misuse) Generative AI?

Implementation of the BC Congenital Anomalies Surveillance System (BCCASS).

Congenital anomalies (CAs) can cause lifelong morbidity and accounted for 23.2% of infant deaths from 2003 to 2007. In British Columbia (BC), surveillance of CAs has been irregular since the early 2000s. To enhance CAs surveillance in BC, the Public Health Agency of Canada has provided funding for the implementation of the BC Congenital Anomalies Surveillance System (BCCASS). BCCASS is a population-based surveillance system. The system leverages existing administrative data sources that capture information regarding vital events, disease status, drug prescription, and healthcare utilization. The system uses a series of algorithms to capture specific CAs diagnoses, some of which are further validated with the support of the Provincial Advisory Committee. This Advisory Committee is a multi-stakeholder coalition that includes the BC Office of the Provincial Health Officer, subject matter experts, data partners, users, and academia, and acts to provide support, expertise, and strategic guidance to BCCASS. Through BCCASS, prevalence and historical trends for 35 CAs in BC are available. Information pertaining to maternal place of residence, risk, and protective factors can be used for association studies such as links to environmental hazards and cluster analysis. BCCASS is a cost-effective and sustainable system that leverages existing data sources necessary to understand the overall burden of CAs across the BC population. This is fundamental to support data-driven decisions around policy development, program planning, and evaluation of preventive measures. Strong coalitions with stakeholders are instrumental to ensure successful implementation and expansion in the future.

National Practice Guidelines for Peer Support Specialists and Supervisors

In 2017, the National Association of Peer Supporters (N.A.P.S.) leadership became aware of growing member concerns about supervision contradicting or conflicting with core peer support values. In response, N.A.P.S. established a work group that revised the association's 2013 National Practice Guidelines for Peer Supporters to include specific guidance to supervisors (i.e., the National Practice Guidelines for Peer Specialists and Supervisors). The new guidelines are not intended to address administrative or other basic functions of supervision; instead, they offer expertise and practical guidance to supervisors of peer support workers in understanding the core values of mutual support and managing the complexities of the nonclinical role in settings that may have different values and priorities.

Harvard Business Review's reframing of digital communication: From professional expertise to practical guidance

In the context of our research work focused on mapping the latest multimodal and hypermodal strategies of constructing and communicating expert knowledge (e.g. Maier, 2014; Maier and Engberg, 2019; Engberg and Maier, 2015a, 2015b; Engberg and Maier, 2019), in this paper we address hypermodal strategies used for conveying domain-specific knowledge and offering practical guidance to various audiences.The empirical evidence is represented by a cluster of digital texts from the Harvard Business Review webpages (https://hbr.org/). This digital context aimed at communicating domain-specific knowledge and practical guidance is characterized by hypermodal communication strategies meant to accommodate various levels of expertise and interests.The paper presents and explains methodological tools suitable for investigating comprehensibility and engagement enhancement when addressing potentially non-academic receivers in a website context. For this purpose, we explore the interaction of semiotic modes as well as hypermodal combinations of the web-based genres. In this context, we aim especially at identifying the roles of the digital affordances in communicating professional expertise and practical guidance with a basis in the same Internet venue. The impact of promotional strategies is also explained.The relevance of this research work lies in its contribution to a better understanding of the complex hypermodal strategies used for reframing the communication of domain-specific knowledge to various audiences.

Toward Complete, Candid, and Unbiased International Consensus Statements on Concussion in Sport.

Five international consensus statements on concussion in sports have been published. This commentary argues that there is a strong need for a new approach to them that foregrounds public health expertise and patient-centered guidance. Doing so will help players, parents and practitioners keep perspective about these potentially life-altering injuries especially when they recur.

Monitoring yeast fermentations by nonlinear infrared technology and chemometrics-understanding process correlations and indirect predictions.

Fermentation processes are still compromised by a lack of monitoring strategies providing integrated process data online, ensuring process understanding, control, and thus, optimal reactor efficiency. The crucial demand for online monitoring strategies, not only encouraged by the PAT initiative but also motivated by modern paradigms such as circular economy and sustainability, has driven research and industry to provide "next-generation process technology": in other words, technology tailored toward industrial needs. Mid-infrared (MIR) spectroscopy as such is superior to near-infrared (NIR) spectroscopy since it provides significantly enhanced selectivity. However, due to high costs and a lack of instrumental robustness, MIR spectroscopy is outcompeted by NIR when it comes to industrial application. The lack of chemometric expertise, model understanding, and practical guidance might add to the slow acceptance of industrial MIR application. This work demonstrates the use of novel MIR, so-called non-linear infrared (NLIR) technology and the importance of model understanding, exemplarily investigated on a lab-scale yeast fermentation process. The six analytes glucose, ethanol, glycerol, acetate, ammonium, and phosphate were modeled by partial least squares (PLS) based on spectral data, demonstrating the potential of the novel technology facilitating online data acquisition and the necessity of investigating indirect predictions. KEY POINTS: • NLIR spectra were acquired online during a yeast fermentation process • PLS models were constructed for six components based on uncorrelated samples • Glucose, ethanol, ammonium, and phosphates were modeled with errors of less than 15% • Acetate and glycerol were shown to rely on indirect predictions.

A Collaborative Multidisciplinary and Without-Walls Research Curriculum in Global Health.

Longitudinal and collaborative global health research curricula to train a well-versed global health corps through skills building in assessment and evaluation are lacking. A without-walls research curriculum was offered to medical and public health students between 2007 and 2015. Mentored cross-disciplinary research projects were developed and implemented in partnership with communities. A multilevel mixed methods design, including semi-structured interviews, post-curriculum surveys, presentations, publications, postgraduation metrics, and feedback from project sites, evaluated educational outcomes. Students (N = 25; aged 27 ± 1.9 years; 90.5% female) participated in the studies in 12 countries, resulting in 26 national-level presentations and 24 peer-reviewed publications, including per student average and range of Institutional Review Board submission (0.95; 0-3), poster presentation (0.85; 0-3), oral presentation (0.65; 0-2), and peer-reviewed submission (1.05; 0-4). On average, the studies (40% mixed methods) lasted 2 years. Analyses and manuscript writing were the most challenging; data collection and presentations were the most rewarding. Majority of the participants strongly agreed with achieving skills in community engagement, interviewing techniques, research design and implementation, research dissemination, and career development. Interview themes included expectations and learning goals, effective mentorship, impact on career goals, and ethical learning. Mentorship qualities were accessibility, real-time problem solving, research expertise, advocate, and balancing guidance with independence. Project sites' feedback was overwhelmingly positive regarding the projects' impact. Postgraduation participants hold positions in humanitarian organizations, research programs serving the underserved, and primary care residencies, fellowships, and faculty. This experience illustrates the feasibility and effectiveness of mentored global health research and underlines the crucial link between community collaboration and scholarship for effective global health practice.

EHS clinical guidelines on the management of the abdominal wall in the context of the open or burst abdomen

To provide guidelines for all surgical specialists who deal with the open abdomen (OA) or the burst abdomen (BA) in adult patients both on the methods used to close the musculofascial layers of the abdominal wall, and regarding possible materials to be used. The guidelines were developed using the Grading of Recommendations Assessment, Development and Evaluation (GRADE) approach including publications up to January 2017. When RCTs were available, outcomes of interest were quantitatively synthesized by means of a conventional meta-analysis. When only observational studies were available, a meta-analysis of proportions was done. The guidelines were written using the AGREE II instrument. For many of the Key Questions that were researched, there were no high quality studies available. While some strong recommendations could be made according to GRADE, the guidelines also contain good practice statements and clinical expertise guidance which are distinct from recommendations that have been formally categorized using GRADE. When considering the OA, dynamic closure techniques should be prioritized over the use of static closure techniques (strong recommendation). However, for techniques including suture closure, mesh reinforcement, component separation techniques and skin grafting, only clinical expertise guidance was provided. Considering the BA, a clinical expertise guidance statement was advised for dynamic closure techniques. Additionally, a clinical expertise guidance statement concerning suture closure and a good practice statement concerning mesh reinforcement during fascial closure were proposed. The role of advanced techniques such as component separation or relaxing incisions is questioned. In addition, the role of the abdominal girdle seems limited to very selected patients.

Penicillin Allergy…Maybe Not? The Military Relevance for Penicillin Testing and De-labeling.

Penicillin allergy is the most common drug allergy reported. About 8-10% of individuals in the USA have a documented penicillin allergy, yet 90% are not truly allergic to penicillin. A penicillin allergy "label" results in increased antibiotic-related adverse reactions and increased health care costs, thus impacting the overall "readiness" of the military. A review of the current literature and approaches to penicillin allergy and "de-labeling" a patient who reports penicillin allergy was conducted and future strategies to identify and assess military beneficiaries were outlined. Military allergists had a formal discussion at the Tri-service Military Allergy Immunology Assembly regarding the state of penicillin allergy testing in military allergy clinics. A PubMed search yielded 5,775 results for "penicillin allergy" and 484 results for "penicillin allergy testing." There were two formalized penicillin testing programs in the military treatment facilities. In 2017, the military trained nearly 165,000 new recruits. If 5-10% reported a penicillin allergy and 90% were de-labeled, that would yield a $15-30 million cost savings annually. Further, de-labeling of the 9.4 million active duty, beneficiaries and retirees with a 90% success rate could result in even greater savings for the military health care system. A penicillin allergy label is a risk to military readiness secondary to associated increases in the length of hospitalizations and emergency department and medical visits. Penicillin de-labeling is a simple intervention that can improve readiness, significantly decrease health care costs and prevent antibiotic resistance, as well as antibiotic-associated adverse events. The military allergist should be "front and center" providing expertise guidance and leadership for clinic and hospital-based penicillin de-labeling efforts which are nested within the antibiotic stewardship programs.

Stakeholders' Guidance Document for Consumer Analytical Devices with a Focus on Gluten and Food Allergens.

Until recently, analytical tests for food were performed primarily in laboratories, but technical developments now enable consumers to use devices to test their food at home or when dining out. Current consumer devices for food can determine nutritional values, freshness, and, most recently, the presence of food allergens and substances that cause food intolerances. The demand for such products is driven by an increase in the incidence of food allergies, as well as consumer desire for more information about what is in their food. The number and complexity of food matrixes creates an important need for properly validated testing devices with comprehensive user instructions (definitions of technical terms can be found in ISO 5725-1:1994 and the International Vocabulary of Metrology). This is especially important with food allergen determinations that can have life-threatening consequences. Stakeholders-including food regulators, food producers, and food testing kit and equipment manufacturers, as well as representatives from consumer advocacy groups-have worked to outline voluntary guidelines for consumer food allergen- and gluten-testing devices. These guidelines cover areas such as kit validation, user sampling instructions, kit performance, and interpretation of results. The recommendations are based on (1) current known technologies, (2) analytical expertise, and (3) standardized AOAC INTERNATIONAL allergen community guidance and best practices on the analysis of food allergens and gluten. The present guidance document is the first in a series of papers intended to provide general guidelines applicable to consumer devices for all food analytes. Future publications will give specific guidance and validation protocols for devices designed to detect individual allergens and gluten, as statistical analysis and review of any validation data, preferably from an independent third party, are necessary to establish a device's fitness-for-purpose. Following the recommendations of these guidance documents will help ensure that consumers are equipped with sufficient information to make an informed decision based on an analytical result from a consumer device. However, the present guidance document emphasizes that consumer devices should not be used in isolation to make a determination as to whether a food is safe to eat. As advances are made in science and technology, these recommendations will be reevaluated and revised as appropriate.

The Influence Of Achievement Subject Package of Expertise (C3), Learning Motivation And Industrial Guidance Toward Achievement of Industrial Working Practice Multimedia Student at State Vocational High School 3 Surakarta

&lt;p&gt;&lt;span&gt;The purpose of this research are to determine the influence between (1) achievement subject package of expertise (C3) toward student’ achievement of industrial working practice (2) learning motivation toward student’ achievement of industrial working practice multimedia (3) industrial guidance toward student’ achievement of industrial working practice (4) the achievement subject package of expertise (C3), learning motivation, industrial guidance toward student’ achievement of industrial working practice. The population was a multimedia student of class XII at State Vocational High School 3 Surakarta. The research was using quantitative approach ex-post facto methods. Data were collected by questionnaire methods and documentation. Those data were analyzed with multiple regression. The result of this research have shown that: First, the achievement subject package of expertise (C3) variable positively and significantly influence toward student’ achievement of industrial working practice. Second, learning motivation variable positively and significantly influence toward student’ achievement of industrial working practice. Third, industrial guidance &lt;/span&gt;variable positively&lt;span&gt; and significantly influences toward student’ achievement of industrial working practice. Fourth, the achievement subject package of expertise (C3), learning motivation, and industrial guidance found to have significant (Fcalculation=10,735&amp;gt; Ftable= 2,77) and positive (rx1x2x3y=0,654; R2=0,428) toward student’ achievement of industrial working practice. The achievement subject package of expertise (C3) has the most significantly influence toward student’ achievement of industrial working practice.&lt;/span&gt;&lt;/p&gt;&lt;p&gt;&lt;span&gt;&lt;a href="http://creativecommons.org/licenses/by-sa/4.0/" rel="license"&gt;&lt;img src="https://i.creativecommons.org/l/by-sa/4.0/88x31.png" alt="Creative Commons License" /&gt;&lt;/a&gt;&lt;br /&gt;This work is licensed under a &lt;a href="http://creativecommons.org/licenses/by-sa/4.0/" rel="license"&gt;Creative Commons Attribution-ShareAlike 4.0 International License&lt;/a&gt;.&lt;/span&gt;&lt;/p&gt;

STAKEHOLDER INVOLVEMENT THROUGHOUT HEALTH TECHNOLOGY ASSESSMENT: AN EXAMPLE FROM PALLIATIVE CARE.

Internationally, funders require stakeholder involvement throughout health technology assessment (HTA). We report successes, challenges, and lessons learned from extensive stakeholder involvement throughout a palliative care case study that demonstrates new concepts and methods for HTA. A 5-step "INTEGRATE-HTA Model" developed within the INTEGRATE-HTA project guided the case study. Using convenience or purposive sampling or directly / indirectly identifying and approaching individuals / groups, stakeholders participated in qualitative research or consultation meetings. During scoping, 132 stakeholders, aged ≥ 18 years in seven countries (England, Italy, Germany, The Netherlands, Norway, Lithuania, and Poland), highlighted key issues in palliative care that assisted identification of the intervention and comparator. Subsequently stakeholders in four countries participated in face-face, telephone and / or video Skype meetings to inform evidence collection and / or review assessment results. An applicability assessment to identify contextual and implementation barriers and enablers for the case study findings involved twelve professionals in the three countries. Finally, thirteen stakeholders participated in a mock decision-making meeting in England. Views about the best methods of stakeholder involvement vary internationally. Stakeholders make valuable contributions in all stages of HTA; assisting decision making about interventions, comparators, research questions; providing evidence and insights into findings, gap analyses and applicability assessments. Key challenges exist regarding inclusivity, time, and resource use. Stakeholder involvement is feasible and worthwhile throughout HTA, sometimes providing unique insights. Various methods can be used to include stakeholders, although challenges exist. Recognition of stakeholder expertise and further guidance about stakeholder consultation methods is needed.

Perception of barriers among Indian Physiotherapists:

With the increasing demand in the health care needs all over the world and so in India, the Physiotherapy profession in India is facing positive as well as negative effects. Even though there is marked increase in the awareness about the profession in the nation, the young physiotherapists are not comfortable enough to take up the challenges. This survey attempts to bring out such issues which are not frankly spoken out. The questionnaire comprises of twenty questions (10 dichotomous type and 10 questions with four choices) under the domains of Knowledge/Vision, Satisfaction and Continuous Professional Development. It is concluded that the academicians should take up extra-responsibility to shape the mindset of physiotherapy students with respect to the hurdles in the profession. The Young professionals/students should frame a vision (with expertise guidance) and work on it and also focus on the development of self and profession rather than blaming / expecting miracle to happen.

The Last Acolhua: Alva Ixtlilxochitl and Elite Native Historiography in Early New Spain

Click to increase image sizeClick to decrease image size AcknowledgementsI am very grateful to Susan Schroeder, Amber Brian, and Brad Benton for bringing our group of Ixtlilxochitl scholars together, and to David Tavarez for helping to launch our project. I have also benefited greatly from the expertise and patient guidance of Camilla Townsend, Kris Lane, and the editors of the Colonial Latin American Review. Finally, I thank Dana Velasco-Murillo and Kevin Terraciano for their generosity, support, and advice.Additional informationNotes on contributorsPeter B. VillellaPeter B. Villella is Assistant Professor of History at the University of North Carolina, Greensboro. His research centers on the legal, political and intellectual histories of native leaders in colonial Mexico, as well as their contributions to the development of Mexican national historiography.

Effects of Expertise and Auditory Guidance on Traditional Dance Performance

This study investigated how the dancers level of expertise and the type of auditory guidance provided influence the kinematic profile of the lower limbs during traditional dance performance. Ten experts in traditional Greek dance (age: 25 ± 3.29 years, five males and five females) and eleven novice participants (age: 26.45 ±3.88 years, six males and five females), all Greek natives, performed a series of Greek and Irish dance steps with auditory guidance of the metrics (verbal counting) and the music of the respective dances. An electromagnetic tracking system sampled (at 100 Hz) the angular displacement of the two lower legs about the Mediolateral axis during dance perfor-mance. Segment rotations were analyzed in the time and frequency domain. Expert dancers displayed significantly lower vari-ability of lower leg rotation and stronger interlimb coupling when compared to novice performers. In novice performers, the power of the lower limb angular dis-placement extended to higher frequencies when dance performance was guided by music compared to metrical guidance. The addition of music and the origin of the dance interfered with performance for novices but not experienced dancers. Kinematic analysis of the lower limbs may open a new window for the investigation of learning and auditory guidance effects on dance performance.