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Search Results: 1 - 10 of 24960 matches for " Cristina Vargas "
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Amendment of the Foreign lnvestment Juridical regime in Colombia
Cristina Vargas Guzman
Revista CIDOB d'Afers Internacionals , 1992,
Abstract: Colombia, integrated in the Andean Group, is now going through a period of economic and institutional modernization and has initiated a serie of modifications, specially of its international trade, finantial, tax, exchange and labour regimes. These have involved some changes which guarantee legislative stability to investors and thus set the grounds for the foreign participation in the economic modernization and internationalization process in Colombia. These facilities need the support of developed countries to achieve its aims.
Reproductive biology and daily and seasonal abundance patterns of Delomys dorsalis (Hensel, 1872) Cricetidae, Sigmodontinae in an area of mixed forest with conifers, Rio Grande do Sul State, Brazil
Cristina Cademartori Vargas
Mastozoolog?-a neotropical , 2003,
Abstract:
De drosófilas a delfines (y humanos también): XVI Encuentro de la Sociedad Internacional de Psicología Comparada
Cristina Vargas-Irwin
Revista Latinoamericana de Psicología , 2010,
Abstract:
Variability in Automatically Generated Raw Activity Scores
Cristina Vargas-Irwin
Frontiers in Behavioral Neuroscience , 2010, DOI: 10.3389/fnbeh.2010.00178
Abstract:
Cannabis consumption by female psychology students: the influence of perceived stress, coping and consumption of drugs in their social environment [Consumo de cannabis en alumnas de Psicología: influencia del estrés percibido, afrontamiento y consumo de drogas en su entorno]
Cristina Vargas,Humberto Manuel Trujillo
Universitas Psychologica , 2012,
Abstract: The consumption of cannabis has increased in the female population. The risk and protection factors associated with an increase or decrease in its consumption may differ as a function of gender, age and substance consumed. The objectives of the present study were to examine the relevance to cannabis consumption by female students of legal drugs consumed by the university students and family members, the consumption of legal and illicit drugs by friends, sociodemographic factors and, psychological variables (perceived stress and different coping strategies). Three questionnaires were administered to 465 female students studying for Psychology degrees. The prevalence of cannabis consumption was 36.3%. The variables predicting its consumption were: a) consumption of illicit drugs and cocaine by friends; b) consumption of tobacco by the students; c) emotion-oriented coping.
ALTERNATIVA METODOLOGICA HOLISTICA PARA ESTUDIANTES DE LA CARRERA DE LENGUA Y LITERATURA DE LA UNIVERSIDAD CATOLICA BOLIVIANA
Toro de Vargas,María Cristina;
Estudios pedagógicos (Valdivia) , 1998, DOI: 10.4067/S0718-07051998000100003
Abstract: the work refers to the application of the wholistic methodology in the learning process of students of the career language and literature at the universidad católica boliviana, cochabamba, bolivia. the following instruments were applied at the beginning and at the end of the course: style of learning and thinking (torrance et al.) and learning style inventory (kolb). several activities were planned, according to the methodology. the experimental group showed, at the end of the process, a noticeable advance in whole brain activities. the same subjects showed better results and satisfaction in their learning. the wholistic methodology is an objective response in the achievement of an integral education.
ADQUISICIóN DE LA RESPUESTA DE CONGELAMIENTO DE RATAS: DIFERENCIAS SEXUALES EN ADOLESCENTES Y ADULTOS
Polanco,Lady Andrea; Vargas-Irwin,Cristina;
Suma Psicológica , 2011,
Abstract: pavlovian fear conditioning is one of the most popular preclinical models in the study of post-traumatic stress disorder (ptsd). the aim of the present research was explore the sex differences that characterize ptsd by means of this experimental paradigm, as well as to offer a preliminary description of how these sex differences behave throughout development. forty five native rats, of wistar descent were used as subjects, with 18 males and 27 females approximately balanced by litter across the two experimental groups: adolescents and adults. the results show significant differences in the second measurement of the conditioned stimulus in the interaction between sex and age and to compare the tree measurements of the conditioned stimulus. results are discussed regarding the discrepancies in the literature regarding the effect of the variables evaluated in the acquisition of conditioned fear.
Within-Session Analysis of the Extinction of Pavlovian Fear-Conditioning Using Robust Regression
Robles,Jaime R; Vargas-Irwin,Cristina;
Suma Psicológica , 2010,
Abstract: traditionally, the analysis of extinction data in fear conditioning experiments has involved the use of standard linear models, mostly anova of between-group differences of subjects that have undergone different extinction protocols, pharmacological manipulations or some other treatment. although some studies report individual differences in quantities such as suppression rates or freezing percentages, these differences are not included in the statistical modeling. withinsubject response patterns are then averaged using coarse-grain time windows which can overlook these individual performance dynamics. here we illustrate an alternative analytical procedure consisting of 2 steps: the estimation of a trend for within-session data and analysis of group differences in trend as main outcome. this procedure is tested on real fear-conditioning extinction data, comparing trend estimates via ordinary least squares (ols) and robust least median of squares (lms) regression estimates, as well as comparing between-group differences and analyzing mean freezing percentage versus lms slopes as outcomes.
EFFECT OF SAMPLING FREQUENCY ON AUTOMATICALLY-GENERATED ACTIVITY AND FREEZING SCORES IN A PAVLOVIAN FEAR-CONDITIONING PREPARATION
Vargas-Irwin,Cristina; Robles,Jaime R.;
Revista Latinoamericana de Psicología , 2009,
Abstract: conditioned freezing has long held conceptual importance in behavior analysis, being pivotal in the explanation of anxiety-like behavior. although initially measured indirectly, through its disruptive effect on operant behavior (conditioned suppression), and later by direct observation, automated techniques of measuring movement have recently become available, which also enable the measurement of conditioned freezing. these video processing techniques allow for the direct and virtually continuous measurement of activity, as compared to the traditional interval sampling approach of direct observation. we examined whether automatically generated freezing and movement scores were equally sensitive to traditional pavlovian conditioning manipulations, and how this sensitivity was affected by the sampling frequency of the data. extinction data for 42 mice were collected at a rate of 30 hz, transformed via re-sampling and analyzed by a generalized linear model to determine the effect size for the presence of the conditioned stimulus for each individual time series under four conditions: high and low resolution raw activity scores and high and low resolution dichotomous freezing scores.the resolution of the data proved to be the most important dimension in estimating local changes in the level of the individual time-series, with activity and freezing scores presenting comparable effect sizes. in contrast with the above, only high-resolution activity measurements proved to be effective in detecting local changes in trends.
ACQUISITION OF FREEZING RESPONSE IN RATS: SEX DIFFERENCES IN ADOLESCENTS AND ADULTS
Lady Andrea Polanco,Cristina Vargas-Irwin
Suma Psicológica , 2011,
Abstract: Pavlovian fear conditioning is one of the most popular preclinical models in the studyof Post-Traumatic Stress Disorder (PTSD). The aim of the present research wasexplore the sex differences that characterize PTSD by means of this experimentalparadigm, as well as to offer a preliminary description of how these sex differencesbehave throughout development. Forty five na ve rats, of Wistar descent were usedas subjects, with 18 males and 27 females approximately balanced by litter acrossthe two experimental groups: adolescents and adults. The results show significantdifferences in the second measurement of the conditioned stimulus in the interactionbetween sex and age and to compare the tree measurements of the conditionedstimulus. Results are discussed regarding the discrepancies in the literature regardingthe effect of the variables evaluated in the acquisition of Conditioned fear.
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