Browsing by Autor "J. Landeira Fernandez"

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • Thumbnail Image
    Item type: Item ,
    Concentrações plasmáticas de corticosterone em ratos Carioca Alto- e Carioca Bajo-Congelamento condicionado após uma tarefa de medo condicionado
    (2013) Laura León; Vitor Castro Gomes; Marcus Lira Brandão; Celso Rodrigues; Fernando P. Cárdenas; J. Landeira Fernandez
  • Thumbnail Image
    Item type: Item ,
    Corticosterone plasma concentrations in Carioca High- and Low-Conditioned freezing rats after a fear conditioned task
    (2013) Laura León; Vitor Castro Gomes; Marcus Lira Brandão; Celso Rodrigues; Fernando P. Cárdenas; J. Landeira Fernandez
    Our group in the Psychology Department at Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio) developed a rat genetic model of extreme freezing in response to contextual cues in an experimental chamber previously associated with footshock. One of the lines, Carioca High Freezing (CHF), exhibits an enhanced conditioned freezing response, whereas the other line, Carioca Low Freezing (CLF), shows the opposite response. The present study investigated corticosterone concentration between these two lines of animals and a random (RND) line of rats both under basal conditions and test condition after an emotional challenge using a contextual fear conditioning protocol. Comparisons between basal and test plasma corticosterone concentrations suggested differential basal and fear-induced differences between the two lines. The differences between basal conditions is an important and relevant aspect to be considered in behavioral experiments using or assessing stress and could help to understand variability in naïve populations.