Josefina Arriagada

Pontificia Universidad Católica de Chile

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Théo Milin

Université de Rennes

Anja G. Teschemacher

University of Bristol

Eliseo O. Campos

Pontificia Universidad Católica de Chile

Lafquen Passalacqua

Universidad Católica del Norte

W. Zieglgänsberger

Max Planck Institute of Psychiatry

Rodrigo Alarcón

Clínica Alemana

Mario Amahiro Tuki

Nibaldo C. Inestrosa

Pontificia Universidad Católica de Chile

Jacobo de Uña‐Álvarez

Universidade de Vigo

Sebastián Paoa

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Pontificia Universidad Católica de Chile

Max Planck Institute of Psychiatry

University of Chile

Case Western Reserve University

Hospital Clínico de la Universidad Católica

Max Planck Society

University of Bristol

NIHR Bristol Cardiovascular Biomedical Research Unit

University College London

University of Helsinki

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Una mirada fugaz al uso de máscaras en Rapa Nui, 1914

Aisthesis Revista Chilena de Investigaciones Estéticas (2023)

Josefina Arriagada Théo Milin Mario Amahiro Tuki

Esta investigación se presenta como un aporte a los estudios culturales de Rapa Nui a partir de un análisis de caso: la serie de fotografías de 1914 que documentan un evento multitudinario en Rapa Nui y donde varias personas aparecen disfrazadas con máscaras de lona. Complementando diversas fuentes y métodos –como fotografías, dibujos, análisis visual, bibliografía y entrevistas–, este artículo busca esclarecer el contexto y los sentidos posibles de lo que hemos denominado como una escena-puzzle, esto es, una escena de la cual se intenta reconstruir una imagen general buscando fragmentos en diferentes fuentes de información. En este trabajo de desenmascaramiento representamos este evento como una fiesta de carácter nacional que incluyó elementos del repertorio cultural contemporáneo de las personas rapanui.

Persona

10.7764/aisth.74.15

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Corticosterone Reduces Synaptic Inhibition in Rat Hippocampal and Neocortical Neurons in vitro

Journal of Neuroendocrinology (1992)

Marc L. Zeise Anja G. Teschemacher Josefina Arriagada W. Zieglgänsberger

Abstract We examined the effect of corticosterone (10 ‐7 to 10 ‐5 M) on membrane properties and postsynaptic potentials, by means of intracellular recordings from neocortical and hippocampal CA1 pyramidal neurons of the intact adult rat in vitro . Corticosterone reduced both the early and the late components of the orthodromically‐evoked inhibitory postsynaptic potential in both structures. The glucocorticoid receptor antagonist RU 38486 (10 ‐6 M) prevented this effect in the hippocampus. In hippocampal, but not in neocortical pyramidal neurons, corticosterone reduced a depolarizing membrane transient evoked by a depolarizing current step and increased the threshold for eliciting action potentials evoked by depolarizing current pulses. Corticosterone did not detectably alter the afterhyperpolarization following repetitive neuronal discharges evoked by current injection, in either the neocortex or in the hippocampus. Excitatory postsynaptic potentials, action potentials, membrane potential and membrane input resistance were also unchanged. The decrease in synaptic inhibition together with the reduction of electrical excitability in the hippocampus, would imply a modulation of response characteristics in pyramidal neurons such that repeated synaptic inputs become more efficient and low frequency input is blunted.

Afterhyperpolarization

Neocortex

Corticosterone

10.1111/j.1365-2826.1992.tb00352.x

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Citations (41)

Sociocultural Effects of the COVID-19 Pandemic on Rapa Nui: Ethnographic Reflections on Tourism Disruption (2020-2024)

Josefina Arriagada Lafquen Passalacqua Théo Milin Sebastián Paoa

Pandemic

2019-20 coronavirus outbreak

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