Point-light biological motion perception activates human premotor cortex

Motion cues can be surprisingly powerful in defining objects and events. Specifically, a handful of point-lights attached to the joints of a human actor will evoke a vivid percept of action when the body is in motion. The perception of point-light biological motion activates posterior cortical areas of the brain. On the other hand, observation of others' actions is known to also evoke activity in motor and premotor areas in frontal cortex. In the present study, we investigated whether point-light biological motion animations would lead to activity in frontal cortex as well. We performed a human functional magnetic resonance imaging study on a high-field-strength magnet and used a number of methods to increase signal, as well as cortical surface-based analysis methods. Areas that responded selectively to point-light biological motion were found in lateral and inferior temporal cortex and in inferior frontal cortex. The robust responses we observed in frontal areas indicate that these stimuli can also recruit action observation networks, although they are very simplified and characterize actions by motion cues alone. The finding that even point-light animations evoke activity in frontal regions suggests that the motor system of the observer may be recruited to "fill in" these simplified displays

The influence of magma storage and ascent conditions on Laguna del Maule rhyolite eruptions

Abstract The scarcity of historical rhyolite eruptions means that volcanological and petrological studies of past eruptions are a key tool for assessing the potential for future hazardous activity and improving interpretations of unrest signals. For the last 18 ky, the Laguna del Maule (LdM) volcanic complex in Chile has erupted primarily rhyolites but with differing magma compositions, eruption styles and eruptive volumes. Rapid surface uplift and episodic seismic activity at LdM over the last two decades has emphasized the need to understand both the recent evolution of the magmatic system and the most likely future eruption scenarios. Using mineral composition, geothermobarometry and MELTS modeling, we assess the influence of the magma storage and ascent conditions on the magnitude and styles of three LdM rhyolites. Magmas of the first and largest Plinian-ignimbrite eruption (LdM: rdm; &amp;gt;17 km3 DRE) form a distinct mineral assemblage with An28–60 plagioclase, amphibole and quartz derived from a magma plumbing system over a large pressure range (90–350 MPa). We suggest that the rdm eruption was triggered by magma recharge and overpressure within a ~ 90 MPa magma chamber of high-silica (&amp;gt;76.5 wt.% SiO2) rhyolitic melt. The rdm eruption appears to have reset the LdM storage conditions, such that subsequent rhyolite eruptions have been smaller (&amp;lt;4 km3 DRE), involved less evolved melt (&amp;lt;75.8 wt.% SiO2) and produced (sub)Plinian-effusive eruption sequences. Of these, we have studied the earliest (Los Espejos: rle) and the most recent (Las Nieblas: rln). Both have mineral assemblages with An20–34 plagioclase and biotite formed in water-saturated crystal-poor rhyolite batches over limited pressure ranges (ΔP ~ 50 MPa) within a rhyodacitic mush reservoir. We suggest that rle and rln were triggered by injection of water-rich magma and volatile exsolution; the transition to effusive behavior occurred because of changes in magma temperature (rle) or magma decompression rate (rln). Similarities in the limited pressure range and high volatile content inferred for the current low-density magma body with the petrologically determined source conditions of magmas that fed past subplinian-effusive eruptions suggest that the next LdM eruption will be similar.</jats:p

Livro do Ponto

Aproximações diversas ao tema da Arte Têxtil resultantes do encontro internacional "Ponto" realizado em Arraiolos em Junho de 2021 com o apoio da Câmara Municipal. Capa de Ana Jotta. Textos: TTT e o Projeto Bodados de Castelo Branco, de Ana Claro, Ana Pires, Guida Fonseca, Maria João Ferreira e Paula Monteiro;Entre a Arte e a Materialidade Têxtil. Crónica de uma Jornada em Progresso, de Ariana Moroder.A Transcendência Mítica e Háptica dos Saberes Cantados e Das Coisas do Tecido de Linho na Aldeia de Limões, de Hugo Ferrão. Entrevista a Helena Loermans.Costureiras e Rainhas: Sobre uma Reconfiguração da Cultura Material Têxtil na Ilha do Pico, de Filomena Silvano.Tecer, a Arte de Dominar a Técnica, de Rita Salvado. Tapetes de Arraiolos: Entre a História e a Tradição e a Contínua Necessidade de Adaptação e Inovação, de Rui Miguel Lobo. O Futuro da Tradição, de Johanna Bramble. A Questão da Arte e do Artesanato Feminino. Petit Point como Ferramenta de Afirmação, de Maria Gimeno. Têxteis e Tecnologia de Mão Dada, de Annet Couwenberg. Smart Fibers for Smart Textiles, de André Pinto, Nelson Durães, Sofia Silva, Kevin Rodrigues, Joana Fonseca e José Silva. A Linha está Ocupada de Benedita Pestana. Contextile: Bienal de Arte Têxtil Contemporânea, de Joaquim Pinheiro. O Pano Flácido: Estratégias de Exposição Têxtil, de Jessica Hemmings. Arte Têxtil? De António Quadros Ferreira. Sobre Pontos Desfeitos (com o Xaile de Hari), de Isabel Sabino. Do Universo do Têxtil nas Artes Plásticas: Dinâmicas do Saber e Fazer na Práxis Artística de Erudição Poética de Margarida Reis. Roupa Coletiva: Espaços Temporários para Afinar Compassos, de Susana Pires. Palácio ou Tenda? Tapetes do Mundo Islâmico e a Inovação na Produção e Design de Jessica Hallett