Lucas Neiva-Silva
Universidade Federal do Rio Grande do Sul
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Publication
Featured researches published by Lucas Neiva-Silva.
Aids and Behavior | 2006
Fernanda Torres de Carvalho; Lucas Neiva-Silva; Mauro Cunha Ramos; Jennifer L. Evans; Silvia Helena Koller; Cesar Augusto Piccinini; Kimberly Page-Shafer
We conducted a cross-sectional study to assess sexual and drug use risk in 161 children and youth in street circumstances in Porto Alegre, Brazil. Median age was 14 and 79% were male. Overall, 59% reported ever having had sex; a significantly higher proportion of males (66%) compared to females (30%). Overall, 39% reported illicit drug use in the last year, and only 1.2% reported injection drug use. In multivariate analyses, correlates of unsafe sex included younger age of sexual debut, and having a steady sex partner. Independent correlates of illicit drug use included lack of family contact, increased hours in the street daily, having had an HIV test, and older age. A high proportion of children and youth in street circumstances reported high risk sex and drug exposures, confirming their vulnerability to HIV/STD. Services Centers, such as where this research was carried out, offer an opportunity for interventions.
Estudos De Psicologia (natal) | 2002
Lucas Neiva-Silva; Silvia Helena Koller
The use of photography in psychological research. Photography has been used widely in different areas of psychological research, in the investigation of several subjects. However, this resource is still little used in Brazil. The objective of this work is, based on the scientific literature, to describe the historical-methodological use of photography in psychological science. Four main functions of its use are identified: recording, model, feedback, and the auto-photographic function. Several studies are presented, highlighting the advantages and disadvantages of each function. We attempt to bring out different themes of psychological study, using photography as a resource. Finally, a description of the auto-photographic method is detailed, outlining its specificities and potential uses.
Cadernos De Saude Publica | 2012
Yone Gonçalves de Moura; Zila M. Sanchez; Emérita Sátiro Opaleye; Lucas Neiva-Silva; Silvia Helena Koller; Ana Regina Noto
The aim of this study was to investigate factors associated to frequent and heavy drug use among street children and adolescents aged 10 to 18 years. A sample of 2,807 street children and adolescents from the 27 Brazilian state capital cities was analyzed. A World Health Organization questionnaire for non-students was adapted for use in Brazil. Data analysis was performed using logistic regression and decision tree models. Factors inversely associated with frequent and heavy drug use were: being age nine to 11 years (OR = 0.1); school attendance (OR = 0.3); daily time (one to five hours) spent on the streets (OR = 0.3 and 0.4); not sleeping on the streets (OR = 0.4); being on the streets for less than one year (OR = 0.4); maintenance of some family bonds (OR = 0.5); presence on the streets of a family member (OR = 0.6); not suffering domestic violence (OR = 0.6); being female (OR = 0.8). All of these variables were significant at the p < 0.05 level. The findings suggest that being younger, having family bonds and engagement in school are important protective factors that affect drug use among this population and should be considered in the formulation of public policies.
Ciencia & Saude Coletiva | 2016
João Carlos Centurion Cabral; Gessyka Wanglon Veleda; Martina Mazzoleni; Elton Pinto Colares; Lucas Neiva-Silva; Vera Torres das Neves
Exposure to high levels of cortisol and self-reported stress, as well as cognitive reserve, have been linked to Alzheimers disease pathology. However, there are no studies on the interaction of these variables. The present study aims to assess the associations of measures of cortisol, self-reported stress, and cognitive reserve with neuropsychological performance in healthy elderly people; besides, to test the interactions between these variables. Cross-sectional analyzes were conducted using data on stress, cognitive reserve and clinical conditions in 145 healthy elderly adults. A neuropsychological battery was used to assess executive functions, verbal memory and processing speed. Measurement of salivary cortisol at the circadian nadir was taken. A negative association between different stress measures and performance on tasks of memory, executive functions and processing speed was observed. Elderly people with higher cognitive reserve showed superior performance on all neuropsychological measures. No significant interaction between stress and cognitive reserve to neuropsychological performance was observed. These results indicate that older adults with high levels of stress and reduced cognitive reserve may be more susceptible to cognitive impairment.
Ciencia & Saude Coletiva | 2018
Lucas Neiva-Silva; Lauro Miranda Demenech; Laísa Rodrigues Moreira; Adriano Trassantes Oliveira; Fernanda Torres de Carvalho; Simone dos Santos Paludo
The aim of this study is to identify the prevalence of pregnancy and abortion experience, along with associated factors among street children, adolescents and youths in Porto Alegre and Rio Grande, RS, Brazil. The sampling method in this cross-sectional study was Respondent-Driven Sampling (RDS), innovative in research about hidden populations. Interviews were conducted with 307 subjects, aged 10 to 21 years. In multivariate analysis, Poisson regression with a robust error variance was used. Most of this sample were males, with no contact with school and family. Almost half of the participants had been on the street for five years or more, spending more than 15 hours per day on the streets. The prevalence of pregnancy experience was 29.3%, independently associated with being a girl, having 10 sexual partners or more in the last year, having a fixed sexual partner in the last year, and being older. The prevalence of abortion experience was 10.4%, independently associated with not living with the family, having more than two pregnancies, and being younger. The high prevalence of pregnancy and abortion experience highlights the need for the development of better sexual and reproductive health policies focused on this population.The aim of this study is to identify the prevalence of pregnancy and abortion experience, along with associated factors among street children, adolescents and youths in Porto Alegre and Rio Grande, RS, Brazil. The sampling method in this cross-sectional study was Respondent-Driven Sampling (RDS), innovative in research about hidden populations. Interviews were conducted with 307 subjects, aged 10 to 21 years. In multivariate analysis, Poisson regression with a robust error variance was used. Most of this sample were males, with no contact with school and family. Almost half of the participants had been on the street for five years or more, spending more than 15 hours per day on the streets. The prevalence of pregnancy experience was 29.3%, independently associated with being a girl, having 10 sexual partners or more in the last year, having a fixed sexual partner in the last year, and being older. The prevalence of abortion experience was 10.4%, independently associated with not living with the family, having more than two pregnancies, and being younger. The high prevalence of pregnancy and abortion experience highlights the need for the development of better sexual and reproductive health policies focused on this population.
DST j. bras. doenças sex. transm | 2005
Lucas Neiva-Silva; Carolina Saraiva de Macedo Lisboa; Silvia Helena Koller
Avances en Psicología Latinoamericana | 2012
Eva Diniz Bensaja dei Schirò; Ana Cristina Garcia Dias; Lucas Neiva-Silva; Carlos José Nieto; Silvia Helena Koller
Aletheia | 2007
Carolina Vieira; Eliane da Silva Moreira Fay; Lucas Neiva-Silva
Archive | 2012
Yone Gonçalves de Moura; Zila M. Sanchez; Emérita Sátiro Opaleye; Lucas Neiva-Silva; Silvia Helena Koller; Ana Regina Noto
Archive | 2012
Eva Diniz; Dei Schiro; Cristina Garcia Dias; Lucas Neiva-Silva; Carlos José Nieto; Helena Koller