65 research outputs found
The Vibrato as Produced on String Instruments
This study is concerned with the production of the vibrato on the violin, viola, and violincello. Comparisons are made with the voice vibrato throughout. The methods of producing the string vibrato physiologically and mechanically are considered
Applications of the Strobophotograph to Phonophotography
A brief description of the mechanism of the strobophotograph was given. A full description is given in the following article by Milton Metfessel: The Strobophotograph: A Device for Measuring Pitch, J. Gen. Psychol., 1929, 2, 135-139
The Damping Constant of Tuning Forks
The differences in the damping constants of tuning forks while testing hearing by both air and bone conduction are discussed. New methods of obtaining the damping constant are described
Effects of Music on Physiological Response
For this study the heart rates of twenty-two members of a college-level music appreciation class were recorded while students listened to the first movement of Beethoven's fifth symphony. The measurements were taken at three different times over a six-week period before, during, and after experimental treatment. Experimental treatment consisted of either audiotutorial tapes or repetitive listening sessions devised for specific musical-ability groups. The same test music was used throughout the entire study to determine the effects of learning and repetitive exposure on heart rate response. A control group had no further exposure to the test music during the study. Stable segments of the test music provoked tachycardia (elevated heart rate) in the subjects, while alternating segments produced bradycardia (lowered heart rate). Heart rate response to music was found to be linked with the presence or absence of learning.Yeshttps://us.sagepub.com/en-us/nam/manuscript-submission-guideline
Neurocognitive functioning in acute or early HIV infection
We examined neurocognitive functioning among persons with acute or early HIV infection (AEH) and hypothesized that the neurocognitive performance of AEH individuals would be intermediate between HIV seronegatives (HIV−) and those with chronic HIV infection. Comprehensive neurocognitive testing was accomplished with 39 AEH, 63 chronically HIV infected, and 38 HIV− participants. All AEH participants were HIV infected for less than 1 year. Average domain deficit scores were calculated in seven neurocognitive domains. HIV−, AEH, and chronically HIV infected groups were ranked from best (rank of 1) to worst (rank of 3) in each domain. All participants received detailed substance use, neuromedical, and psychiatric evaluations and HIV infected persons provided information on antiretroviral treatment and completed laboratory evaluations including plasma and CSF viral loads. A nonparametric test of ordered alternatives (Page test), and the appropriate nonparametric follow-up test, was used to evaluate level of neuropsychological (NP) functioning across and between groups. The median duration of infection for the AEH group was 16 weeks [interquartile range, IQR: 10.3–40.7] as compared to 4.9 years [2.8–11.1] in the chronic HIV group. A Page test using ranks of average scores in the seven neurocognitive domains showed a significant monotonic trend with the best neurocognitive functioning in the HIV− group (mean rank = 1.43), intermediate neurocognitive functioning in the AEH group (mean rank = 1.71), and the worst in the chronically HIV infected (mean rank = 2.86; L statistic = 94, p < 0.01); however, post-hoc testing comparing neurocognitive impairment of each group against each of the other groups showed that the chronically infected group was significantly different from both the HIV− and AEH groups on neurocognitive performance; the AEH group was statistically indistinguishable from the HIV− group. Regression models among HIV infected participants were unable to identify significant predictors of neurocognitive performance. Neurocognitive functioning was worst among persons with chronic HIV infection. Although a significant monotonic trend existed and patterns of the data suggest the AEH individuals may fall intermediate to HIV− and chronic participants, we were not able to statistically confirm this hypothesis
Cognitive Neuropsychology of HIV-Associated Neurocognitive Disorders
Advances in the treatment of the human immunodeficiency virus (HIV) have dramatically improved survival rates over the past 10 years, but HIV-associated neurocognitive disorders (HAND) remain highly prevalent and continue to represent a significant public health problem. This review provides an update on the nature, extent, and diagnosis of HAND. Particular emphasis is placed on critically evaluating research within the realm of cognitive neuropsychology that aims to elucidate the component processes of HAND across the domains of executive functions, motor skills, speeded information processing, episodic memory, attention/working memory, language, and visuoperception. In addition to clarifying the cognitive mechanisms of HAND (e.g., impaired cognitive control), the cognitive neuropsychology approach may enhance the ecological validity of neuroAIDS research and inform the development of much needed novel, targeted cognitive and behavioral therapies
Tendencias de la cultura y cambio organizacional: estudio de caso
La imagen corporativa en relación con el medio se evidencia en el informe de Deloitte (2018) sobre tendencias del capital humano, en donde se reportan alrededor de 11.000 cuestionarios aplicados a gerentes de 140 países y 150 líderes de empresas colombianas, el planteamiento realizado sugiere que el capital social cobra tanto importancia como el físico y el financiero. Estos aspectos están relacionados con la identidad corporativa y cómo se relaciona a su vez con la cultura y la gestión del en la organización. La cultura y la gestión del cambio han cobrado mucho interés para las personas que guían las organizaciones, los estudios realizados por Deloitte en 2017 se focalizaron en la relación de la cultura y el compromiso como elementos importantes del empleado; los resultados del estudio dejan en evidencia cómo la habilidad de las organizaciones para afrontar inconvenientes de compromiso y cultura tenían una reducción del 14% con respecto al año anterior, estos datos permiten entender la complejidad del ambiente en el ámbito laboral y dan cuenta de la importancia de desarrollar conocimiento válido que oriente a académicos y empresarios para que puedan abordar
de una manera adecuada estos aspectos.1a edició
Voluntary disclosure of corporate strategy: determinants and outcomes. An empirical study into the risks and payoffs of communicating corporate strategy.
Business leaders increasingly face pressure from stakeholders to be transparent. There
appears however little consensus on the risks and payoffs of disclosing vital information
such as corporate strategy. To fill this gap, this study analyzes firm-specific determinants
and organisational outcomes of voluntary disclosure of corporate strategy. Stakeholder
theory and agency theory help to understand whether companies serve their interest to
engage with stakeholders and overcome information asymmetries. I connect these
theories and propose a comprehensive approach to measure voluntary disclosure of
corporate strategy. Hypotheses from the theoretical framework are empirically tested
through panel regression of data on identified determinants and outcomes and of
disclosed strategy through annual reports, corporate social responsibility reports,
corporate websites and corporate press releases by the 70 largest publicly listed
companies in the Netherlands from 2003 through 2008. I found that industry,
profitability, dual-listing status, national ranking status and listing age have significant
effects on voluntary disclosure of corporate strategy. No significant effects are found for
size, leverage and ownership concentration. On outcomes, I found that liquidity of stock
and corporate reputation are significantly influenced by voluntary disclosure of corporate
strategy. No significant effect is found for volatility of stock. My contributions to theory,
methodology and empirics offers a stepping-stone for further research into understanding
how companies can use transparency to manage stakeholder relations
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