Search results for "Navigation"
showing 10 items of 297 documents
Ebselen prevents chronic alcohol-induced rat hippocampal stress and functional impairment
2007
Background: Most of the previously published data suggest a role for oxidative or nitrosative stress in ethanol-induced nervous system damage. Moreover, ethanol is able to impair learning abilities in adult mammalian brain, a process suggested to be directly related to hippocampal neurogenesis. Ebselen, a synthetic compound with antioxidant properties, is able to prevent ethanol-induced impairment of neurogenesis in adult rats. The aim of the present work was to further demonstrate the ability of ebselen to prevent biochemical alterations, and preserve long-term potentiation (LTP) and learning abilities, in the hippocampus of chronic alcoholic adult rats. Methods: Biochemical markers of oxi…
Endo-neuro-sonography: Anatomical aspects of the basal cisterns
1997
SummaryTo evaluate the usefulness of transendoscopic sonography, two sono catheters of 6F diameter were studied in 15 fresh specimens. A precise imaging was seen of well known anatomical structures. An additional dimension in endoscopy was also obtained as the sono added to the endo view a transversal scan like a mini CT at the tip of the probe. The guiding characteristic of this imaging technique, which is in real time and on line, was also experienced. These observations offer such interesting prospects for use in minimally invasive neurosurgery that further development and clinical experience seem to be justified.
‘I changed my life’s course’ : The impact of the Helsingin Sanomat Foundation fellowship on the career path of a journalist
2017
This study focuses on the fellowship program of Helsingin Sanomat Foundation, which has sent a hundred mid-career journalists from Finland to study abroad at prominent universities. Based on two surveys, one on the fellows (n = 45) and one on a control group (n = 52), the article discusses the impact the fellowship education has on the journalists and their careers. The surveys are complemented with in-depth interviews of 10 fellow journalists. The results are discussed in the context of protean career concept, and they indicate that the fellowship period has a notable positive impact on the career of an individual journalist, but a contradictory impact on the journalist’s home organizatio…
Multimodal Simulation of a Novel Device for a Safe and Effective External Ventricular Drain Placement
2021
BackgroundExternal ventricular drain (EVD) placement is mandatory for several pathologies. The misplacement rate of the EVD varies widely in literature, ranging from 12.3 to 60%. The purpose of this simulation study is to provide preliminary data about the possibility of increasing the safety of one of the most common life-saving procedures in neurosurgery by testing a new device for EVD placement.MethodsWe used a novel guide for positioning the ventricular catheter (patent RM2014A000376). The trajectory was assessed using 25 anonymized head CT scans. The data sets were used to conduct three-dimensional computer-based and combined navigation and augmented reality-based simulations using pla…
ANTECEDENTES DEL ABASTECIMIENTO DE MADERA EN LA RIBERA DEL JÚCAR
2015
Wood's supply was an essential aspect for the Kingdom of Valencia during the medieval centuries. The large plain around the coast and the forest shortage caused, firstly, the development of supplying strategies and, secondly, the creation of specifical orders in order to guarantee it. In that sense, Júcar and its tributary Cabriel played an important role in the trunks traffic coming from the mountains of Cuenca. Also, the surrounding countryside was primordial in the procedure. In this article we are going to analyse the methods in use in the Almoravid period and the circumstances of the trunks navigation on the river after the conquest. El abastecimiento de madera fue un aspecto fundament…
Enhanced Spatial Navigation Skills in Sequence-Space Synesthetes
2018
Contains fulltext : 219554.pdf (Publisher’s version ) (Closed access) Individuals with sequence-space synesthesia (SSS) perceive sequences like months, days and numbers in certain spatial arrangements. Several cognitive benefits have been associated with SSS, such as enhanced mental rotation, more vivid visual imagery and an advantage in spatial processing. The current study aimed to further investigate these cognitive benefits, focusing on spatial navigation skills, to explore if their enhanced sensitivity to spatial relations is reflected in enhanced navigational performance. Synesthetes were distinguished from controls by means of a questionnaire, a consistency test and drawings. A virtu…
Artificial organisms as tools for the development of psychological theory: Tolman's lesson
2007
In the 1930s and 1940s, Edward Tolman developed a psychological theory of spatial orientation in rats and humans. He expressed his theory as an automaton (the ‘‘schematic sowbug’’) or what today we would call an ‘‘artificial organism.’’ With the technology of the day, he could not implement his model. Nonetheless, he used it to develop empirical predictions which tested with animals in the laboratory. This way of proceeding was in line with scientific practice dating back to Galileo. The way psychologists use artificial organisms in their work today breaks with this tradition. Modern ‘‘artificial organisms’’ are constructed a posteriori, working from experimental or ethological observations…
The evolution of evolvability
2005
Ever since Ruth Garrett Millikan burst on the scene with her famous 1984 book Language, Thought, and Other Biological Categories [1] she has continued to make substantial contributions, in a remarkably sustained effort that significantly shaped the theoretical landscape in a number of fast-moving fields, from cognitive science to the philosophies of mind, language and biology [1–3]. One of her many achievements lies in the development of a new theoretical approach to cognitive semantics, which philosophers know under the heading of ‘teleofunctionalism’.
Sequence Learning in a Single Trial: A Spiking Neurons Model Based on Hippocampal Circuitry.
2020
ABSTRACTIn contrast with our everyday experience using brain circuits, it can take a prohibitively long time to train a computational system to produce the correct sequence of outputs in the presence of a series of inputs. This suggests that something important is missing in the way in which models are trying to reproduce basic cognitive functions. In this work, we introduce a new neuronal network architecture that is able to learn, in a single trial, an arbitrary long sequence of any known objects. The key point of the model is the explicit use of mechanisms and circuitry observed in the hippocampus, which allow the model to reach a level of efficiency and accuracy that, to the best of our…
Social Network Analysis and Qualitative Interviews for Assessing Geographic Characteristics of Tourism Business Networks.
2015
This study integrates quantitative social network analysis (SNA) and qualitative interviews for understanding tourism business links in isolated communities through analysing spatial characteristics. Two case studies are used, the Surselva-Gotthard region in the Swiss Alps and Longyearbyen in the Arctic archipelago of Svalbard, to test the spatial characteristics of physical proximity, isolation, and smallness for understanding tourism business links. In the larger Surselva-Gotthard region, we found a strong relationship between geographic separation of the three communities on compartmentalization of the collaboration network. A small set of businesses played a central role in steering col…