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Search Results: 1 - 10 of 1562 matches for " Salinas "
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Avances en el Manejo Nutricional de Oso Andino (Tremarctos ornatus)
Alexandra Salinas-Salinas
Memorias de la Conferencia Interna en Medicina y Aprovechamiento de Fauna Silvestre, Exótica y no Convencional , 2009,
Abstract: El oso andino o de anteojos (Tremarctos ornatus, Cuvier, 1825) único representante de la familia Ursidae en Sudamérica, es el mamífero más grande de los ecosistemas que habita, ya que puede llegar a medir hasta 2m de altura y pesar 175Kg...
How Behavioral Constraints May Determine Optimal Sensory Representations
Emilio Salinas
PLOS Biology , 2012, DOI: 10.1371/journal.pbio.0040387
Abstract: The sensory-triggered activity of a neuron is typically characterized in terms of a tuning curve, which describes the neuron's average response as a function of a parameter that characterizes a physical stimulus. What determines the shapes of tuning curves in a neuronal population? Previous theoretical studies and related experiments suggest that many response characteristics of sensory neurons are optimal for encoding stimulus-related information. This notion, however, does not explain the two general types of tuning profiles that are commonly observed: unimodal and monotonic. Here I quantify the efficacy of a set of tuning curves according to the possible downstream motor responses that can be constructed from them. Curves that are optimal in this sense may have monotonic or nonmonotonic profiles, where the proportion of monotonic curves and the optimal tuning-curve width depend on the general properties of the target downstream functions. This dependence explains intriguing features of visual cells that are sensitive to binocular disparity and of neurons tuned to echo delay in bats. The numerical results suggest that optimal sensory tuning curves are shaped not only by stimulus statistics and signal-to-noise properties but also according to their impact on downstream neural circuits and, ultimately, on behavior.
Context-dependent selection of visuomotor maps
Emilio Salinas
BMC Neuroscience , 2004, DOI: 10.1186/1471-2202-5-47
Abstract: By means of three hypothetical visuomotor tasks, I study a class of neural network models in which any one of several possible stimulus-response maps or rules can be selected according to context. The underlying mechanism based on gain modulation has three key features: (1) modulating the sensory responses is equivalent to switching on or off different subpopulations of neurons, (2) context does not need to be represented continuously, although this is advantageous for generalization, and (3) context-dependent selection is independent of the discriminability of the stimuli. In all cases, the contextual cues can quickly turn on or off a sensory-motor map, effectively changing the functional connectivity between inputs and outputs in the networks.The modulation of sensory-triggered activity by proprioceptive signals such as eye or head position is regarded as a general mechanism for performing coordinate transformations in vision. The present results generalize this mechanism to situations where the modulatory quantity and the input-output relationships that it selects are arbitrary. The model predicts that sensory responses that are nonlinearly modulated by arbitrary context signals should be found in behavioral situations that involve choosing or switching between multiple sensory-motor maps. Because any relevant circumstancial information can be part of the context, this mechanism may partly explain the complex and rich behavioral repertoire of higher organisms.The concept of a direct, one-to-one association between a sensory stimulus and a motor response has been strongly influential in neuroscience [1]. Such associations may be quite complex; for instance, monkeys can learn visuomotor mappings based on arbitrary rules [2-4]. But from a mechanistic point of view, it is their flexibility which is remarkable. Humans and other mammals react to a given stimulus in drastically different ways depending on the context [1,5-7]. What is the neural basis for this? How do cu
Colonialidad, Modernidad y representación en el cine latinoamericano contemporáneo: De Memorias del subdesarrollo a Pizza, Birra, Faso
Aisthesis , 2012, DOI: 10.4067/S0718-71812012000100008
Abstract: the following paper aims to review and analyze how latin america's colonialism and modernity have been represented, built and interrogated in two major films of regional contemporary cinema: memorias del subdesarrollo (memories of underdevelopment) cuba, 1968 and pizza, birra, faso (pizza, beer, fag), argentina, 1998. we have two questions to answer: what images of coloniality and modernity are pictured in these films? how are ?coloniality? and ?modernity? articulated in the selected films?
Rodrigo Salinas
Revista Chilena de Neuro-Psiquiatría , 2006,
MADERAS : Ciencia y Tecnología , 2004,
Plenitudo Legis Dilectio
Carlos Salinas
Teología y vida , 2004,
The Color of Medicine
Diana Salinas
Medical Student Research Journal , 2013,
Abstract: "I will not permit considerations of religion, nationality, race, gender, politics, socioeconomic standing, or sexual orientation to intervene between my duty and my patient." This bullet point from the physician's oath is engraved around the margins to remind us that as physicians we should treat and care for each patient equally and in an unbiased manner, but at the same time understand that universal treatment plan will not apply to all patients.
Cattan Atala, ángela - Guzmán Brito, Alejandro (editores), Homenaje a los profesores Alamiro de ávila Martel, Benjamín Cid Quiroz, Hugo Hanisch Espíndola (Ediciones Universidad del Desarrollo, Santiago, 2005), 404 págs
Carlos Salinas
Revista de estudios histórico-jurídicos , 2005,
García y García, Antonio, Historia del Concilio IV Lateranense de 1215 (Centro de Estudios Orientales y Ecuménicos Juan XXIII, Biblioteca Oecumenica Salmanticensis 31, Salamanca, 2005), 332 págs
Carlos Salinas
Revista de estudios histórico-jurídicos , 2005,
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