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Lack of contextual modulation of habituated neuroendocrine responses to repeated audiogenic stress.
Nyhuis, Tara J; Sasse, Sarah K; Masini, Cher V; Day, Heidi E W; Campeau, Serge.
Afiliação
  • Nyhuis TJ; Department of Psychology and Neuroscience, University of Colorado, Boulder, CO 80309, USA. tara.nyhuis@colorado.edu
Behav Neurosci ; 124(6): 810-20, 2010 Dec.
Article em En | MEDLINE | ID: mdl-21038933
Exposure to stress reliably activates the hypothalamo-pituitary-adrenocortical (HPA) axis response in rodents, which is significantly reduced (habituated) following repeated exposures. In the current study, it was first established that HPA axis response habituation to repeated loud noise lasted for at least 4 weeks in rats. In the next experiment, a contextual extinction procedure following repeated loud noise exposures failed to restore the habituated HPA axis response. Although an additional study indicated some recovery of responses when the context was modified on a test day following habituation, this effect could be mostly attributed to the familiarity with the contextual cues. A final study confirmed that rats could distinguish between the contexts used and further indicated that context preexposures reduce acute HPA axis responses to loud noise. These studies therefore provide no support for the hypothesis that contextual cues regulate HPA axis response habituation.
Assuntos

Texto completo: 1 Bases de dados: MEDLINE Assunto principal: Sistema Hipófise-Suprarrenal / Estresse Fisiológico / Estresse Psicológico / Habituação Psicofisiológica / Sistema Hipotálamo-Hipofisário Limite: Animals Idioma: En Revista: Behav Neurosci Ano de publicação: 2010 Tipo de documento: Article País de afiliação: Estados Unidos

Texto completo: 1 Bases de dados: MEDLINE Assunto principal: Sistema Hipófise-Suprarrenal / Estresse Fisiológico / Estresse Psicológico / Habituação Psicofisiológica / Sistema Hipotálamo-Hipofisário Limite: Animals Idioma: En Revista: Behav Neurosci Ano de publicação: 2010 Tipo de documento: Article País de afiliação: Estados Unidos