En este artículo se presenta el guión de una conferencia que Roberto Lehmann-Nitsche, pocos años después de radicarse en la Argentina, desarrolló en 1901 acerca del folklore mapuche. La intervención se realizó a solicitud de la Deutschen Frauen Verein, una asociación de mujeres alemanas con sede en la ciudad de Buenos Aires, y abordó aspectos teóricos sobre esta disciplina, entonces en expansión, desde la perspectiva germana. Además, realizó una catalogación de los materiales empíricos documentados por este antropólogo durante (...) los primeros años de su residencia en el país. El texto original, hasta el momento inédito, se entrega en su versión en alemán y en traducción al español. En la presentación se proporciona un análisis que permite reconocer cómo en esta intervención se integran apreciaciones que Lehmann-Nitsche también sostuvo en posteriores publicaciones científicas y de divulgación por él realizadas. Como se sabe, su producción en el campo del folklore comprendió dos vertientes: por un lado, el folklore criollo y por otro, el devenido de arte verbal y tradiciones de los pueblos indígenas preexistentes, en especial textos correspondientes a géneros narrativos y adivinanzas en las lenguas propias y en castellano. En relación con este último aspecto, se retoman aportes de autores filiados en la tradición germana a fin de indicar afinidades y vínculos, con algunos americanistas que eran sus contemporáneos. (shrink)

The transits of Venus in 1761 and 1769 appear to mark the starting point of instrumental science in the Dutch East Indies (now Indonesia). This essay examines the conditions that triggered and constituted instrumental and institutional science on Indonesian soil in the late eighteenth century. In 1765 the Reverend J. M. Mohr, whose wife had received a large inheritance, undertook to build a fully equipped private observatory in Batavia (now Jakarta). There he made several major astronomical and meteorological observations. Mohr’s (...) initiative inspired other Europeans living on Java around 1770 to start a scientific movement. Because of the lack of governmental and other support, it was not until 1778 that this offspring of the Dutch‐Indonesian Enlightenment became a reality. The Bataviaasch Genootschap van Kunsten en Wetenschappen tried from the beginning to put into effect the program Mohr had outlined. The members even bought his instruments from his widow, intending to continue his measurements. For a number of reasons, however, this instrumental program was more than the society could support. Around 1790 instrumental science in the former Dutch East Indies came to a standstill, not to be resumed for several decades. (shrink)

An unprecedented level of confidence has recently crystallized around a new hypothesis of how living placental mammals share a pattern of common descent. The major groups are afrotheres (e.g., aardvarks, elephants), xenarthrans (e.g., anteaters, sloths), laurasiatheres (e.g., horses, shrews), and euarchontoglires (e.g., humans, rodents). Compared with previous hypotheses this tree is remarkably stable; however, some uncertainty persists about the location of the placental root, and (for example) the position of bats within laurasiatheres, of sea cows and aardvarks within afrotheres, and (...) of dermopterans within euarchontoglires. A variety of names for sub‐clades within the new placental mammal tree have been proposed, not all of which follow conventions regarding priority and stability. More importantly, the new phylogenetic framework enables the formulation of new hypotheses and testing thereof, for example regarding the possible developmental dichotomy that seems to distinguish members of the newly identified southern and northern radiations of living placental mammals. (shrink)

Anxiety disorders are among the most prevalent mental disorders. Present treatments such as cognitive behavior therapy and pharmacological treatments show only moderate success, which emphasizes the importance for the development of new treatment protocols. Non-invasive brain stimulation methods such as repetitive transcranial magnetic stimulation and transcranial direct current stimulation have been probed as therapeutic option for anxiety disorders in recent years. Mechanistic information about their mode of action, and most efficient protocols is however limited. Here the fear extinction model can (...) serve as a model of exposure therapies for studying therapeutic mechanisms, and development of appropriate intervention protocols. We systematically reviewed 30 research articles that investigated the impact of rTMS and tDCS on fear memory and extinction in animal models and humans, in clinical and healthy populations. The results of these studies suggest that tDCS and rTMS can be efficient methods to modulate fear memory and extinction. Furthermore, excitability-enhancing stimulation applied over the vmPFC showed the strongest potential to enhance fear extinction. We further discuss factors that determine the efficacy of rTMS and tDCS in the context of the fear extinction model and provide future directions to optimize parameters and protocols of stimulation for research and treatment. (shrink)