Artículos con la etiqueta ‘cerebro’

Ray Kurzweil: el genoma puede representarse por 50 millones de bits

Por • 25 oct, 2010 • Category: Ciencia y tecnología, Filosofía, informatica, Opinion

No existe un detector de conciencia en los seres humanos, explica el inventor y futurólogo norteamericano Ray Kurzweil en la siguiente entrevista. Añade que la memoria no puede confundirse con la conciencia y que no es posible probar que no estemos realmente conscientes incluso bajo la anestesia. Respecto a los intentos de simular al cerebro humano, Kurzweil señala que mediante la compresión de la información, el genoma puede estar representado por 50 millones de bits, de los cuales la mitad solamente interesa a la génesis del cerebro. Eso puede ser simulado por un millón de líneas de código solamente.



Scientists find link in humans between nerve cell production, memory

Por • 9 sep, 2010 • Category: Ciencia y tecnología

Production of new nerve cells in the human brain is linked to learning and memory, according to a new study from the University of Florida. The research is the first to show such a link in humans. The findings, published online and in an upcoming print issue of the journal Brain, provide clues about processes involved in age- and health-related memory loss and reveal potential cellular targets for drug therapy.



Attention, couch potatoes! Walking boosts brain connectivity, function

Por • 9 sep, 2010 • Category: Ciencia y tecnología

A group of “professional couch potatoes,” as one researcher described them, has proven that even moderate exercise – in this case walking at one’s own pace for 40 minutes three times a week – can enhance the connectivity of important brain circuits, combat declines in brain function associated with aging and increase performance on cognitive tasks.



Plasticity of brain networks in a randomized intervention trial of exercise training in older adults

Por • 8 sep, 2010 • Category: Ciencia y tecnología

Research has shown the human brain is organized into separable functional networks during rest and varied states of cognition, and that aging is associated with specific network dysfunctions.



A new blueprint for artificial general intelligence

Por • 17 ago, 2010 • Category: Ciencia y tecnología

Demis Hassabis, a research fellow at the Gatsby Computational Neuroscience Unit, University College London, is out to create a radical new kind of artficial brain.



New Study Examines the Brain’s Wiring

Por • 15 ago, 2010 • Category: Ciencia y tecnología

The brain has been mapped to the smallest fold for at least a century, but still no one knows how all the parts talk to each other.

A study in Proceedings of the National Academy of Sciences answers that question for a small area of the rat brain and in so doing takes a big step toward revealing the brain’s wiring.



hypothesis: driven structural connectivity analysis supports network over hierarchical model of brain architecture

Por • 11 ago, 2010 • Category: Ciencia y tecnología

The brain is usually described as hierarchically organized, although an alternative network model has been proposed. To help distinguish between these two fundamentally different structure-function hypotheses, we developed an experimental circuit-tracing strategy that can be applied to any starting point in the nervous system and then systematically expanded, and applied it to a previously obscure dorsomedial corner of the nucleus accumbens identified functionally as a “hedonic hot spot.” A highly topographically organized set of connections involving expected and unexpected gray matter regions was identified that prominently features regions associated with appetite, stress, and clinical depression. These connections are arranged as a longitudinal series of circuits (closed loops). Thus, the results do not support a rigidly hierarchical model of nervous system organization but instead indicate a network model of organization. In principle, the double-coinjection circuit tracing strategy can be applied systematically to the rest of the nervous system to establish the architecture of the global structural wiring diagram, and its abstraction, the connectome.