144 research outputs found

    The Effects of Response Lever Position on the Performance of Rats with Septal Lesions in a Lever-Press Shock-Escape Task

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    A thesis presented to the faculty of the School of Education at Morehead State University in partial fulfillment of the requirement for the Degree of Master of Arts by Edward Brooks Applegate III on October 28, 1983

    Measuring Invariance of Theory of Planned Behavior Model on Online Fitness Program Participation During the COVID-19 Pandemic

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    Theory of Planned Behavior (TPB) is one of the most frequently cited and most influential models to explain and predict human intentions and behaviors (Ajzen, 1991, 2011; Kim & James, 2016), which include physical activity and exercise. However, the dimensionality of TPB has not been examined in the context of online fitness program (OFP) participation during the COVID-19 pandemic. The purpose of this study was to examine the TPB measurement parameters of the factorial models and determine the generalizability of the psychological constructs of the TPB model on gender groups and whether COVID-19 affected annual income groups. The participants were 18 years or older adults in U.S.A. and self-identified as OFP participants during the COVID-19 pandemic. They were recruited using Amazon Mechanical Turk. TPB was used to examine OFP participation behavior with four constructs: Attitudes toward a behavior (AB), subjective norm (SN), perceived behavioral control (PBC), and participation intention (PI) along with an additional construct role identity (RI). Data were collected through Qualtrics and analyzed in RStudio-1.4.1106. Multiple group confirmatory factor analyses (CFA) were conducted to investigate measurement invariance on gender (male or female) and COVID-19 impact (yes or no), respectively. Final data for analyses included 724 respondents (52.5% males; 47.9% reported no). The CFA results supported unidimensionality of the modified TPB scale. Invariance tests were conducted at all levels of AB, SN, PBC, PI, and RI measures for both male and female groups and COVID-19 impacted groups: Dimensional (equal number of latent factors), configural (equal factor structure), weak (equal factor loadings), strong (equal indicator intercepts), and strict (equal indicator residuals), respectively. The results showed that each of the equal indicator residual models had an overall satisfactory fit to the OFP participation data for both male and female groups as well as the two COVID-19 impacted groups. Comparing with the equal indicator intercept solution regarding the groups in both gender and COVID-19 impact, each of the equal indicator residual models for AB and SN did not result in a significant degradation in model-data fit. But PBC, PI, and RI had significant chi-square changes and the changes of their CFIs were greater than 0.01. Results showed that the adapted TPB scale is valid for measuring OFP participation intention constructs during the COVID-19 pandemic. Since invariant factor loadings and indicator intercepts of TPB measures have achieved, it has confirmed that it is valid to be used in group comparison of latent scores

    Serotonin, Septal Lesions, and Shock-Escape Learning in Rats

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    An article written by Bruce A. Mattingly, James E. Gotsick and E. Brooks Applegate and published in Psychological Reports in 1986, pages 3-9

    Gait and Force Analysis of Provoked Pig Gait on Clean and Fouled Concrete Surfaces

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    Gait and force analysis have proven to be useful methods in linking claw injuries to surface material conditions. To determine the relationship between claw disorder and floor properties such as friction and surface abrasiveness, the factors controlling gait must be characterised. The effects of fouled concrete floor conditions on the gait of 10 pigs walking in a curve, using kinematics and kinetics to record gait parameters and slip frequency are described and compared with clean conditions. Pigs adapted to fouled floor conditions by reducing their walking speed and stride length, using a higher number of 3-foot support phases and by lowering diagonality. This adaption produced lower vertical forces, a twofold reduction in propulsion and outward stabilisation force and a threefold increase in braking force, without reducing the peak utilised coefficient of friction (UCOF). The UCOF values for both limbs of the curve walking pigs exceeded the recorded dynamic coefficient of friction and the corresponding UCOF values for pigs walking a straight line in fouled floor condition. As UCOF increased and available friction from the fouled floor surface decreased, this resulted in higher forward and backward slip frequency in both limbs for pigs walking in a curve. Pigs provoked to walk in a curve can adapt to fouled floor condition, but if the floor is heavily fouled this adaption is not sufficient to ensure safe walking

    Using confirmatory factor analysis to measure contemporaneous activation of defined neuronal networks in functional magnetic resonance imaging

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    a b s t r a c t a r t i c l e i n f o Functional neuroimaging often generates large amounts of data on regions of interest. Such data can be addressed effectively with a widely-used statistical technique based on measurement theory that has not yet been applied to neuroimaging. Confirmatory factor analysis is a convenient hypothesis-driven modeling environment that can be used to conduct formal statistical tests comparing alternative hypotheses regarding the elements of putative neuronal networks. In such models, measures of each activated region of interest are treated as indicators of an underlying latent construct that represents the contemporaneous activation of the elements in the network. As such, confirmatory factor analysis focuses analyses on the activation of hypothesized networks as a whole, improves statistical power by modeling measurement error, and provides a theory-based approach to data reduction with a robust statistical basis. This approach is illustrated using data on seven regions of interest in a hypothesized mesocorticostriatal reward system in a sample of 262 adult volunteers assessed during a card-guessing reward task. A latent construct reflecting contemporaneous activation of the reward system was found to be significantly associated with a latent construct measuring impulsivity, particularly in males

    Differential cross sections and spin density matrix elements for the reaction gamma p -> p omega

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    High-statistics differential cross sections and spin density matrix elements for the reaction gamma p -> p omega have been measured using the CLAS at Jefferson Lab for center-of-mass (CM) energies from threshold up to 2.84 GeV. Results are reported in 112 10-MeV wide CM energy bins, each subdivided into cos(theta_CM) bins of width 0.1. These are the most precise and extensive omega photoproduction measurements to date. A number of prominent structures are clearly present in the data. Many of these have not previously been observed due to limited statistics in earlier measurements

    The advancement of blood cell research by optical tweezers

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    Demonstration of the light radiation pressure on a microscopic level by A. Ashkin led to the invention of optical tweezers (OT). Applied in the studies of living systems, OT have become a preferable instrument for the noninvasive study of microobjects, allowing manipulation and measurement of the mechanical properties of molecules, organelles, and cells. In the present paper, we overview OT applications in hemorheological research, placing emphasis on red blood cells but also discussing OT applications for the investigation of the biomechanics of leukocytes and platelets. Blood properties have always served as a primary parameter in medical diagnostics due to the interconnection with the physiological state of an organism. Despite blood testing being a well-established procedure of conventional medicine, there are still many complex processes that must be unraveled to improve our understanding and contribute to future medicine. OT are advancing single-cell research, promising new insights into individual cell characteristics compared to the traditional approaches. We review the fundamental and practical findings revealed in blood research through the optical manipulation, stretching, guiding, immobilization, and inter-/intracellular force measurements of single blood cells
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