Videos tagged 'Vision Science Sponsored Talks'
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Simon Laughlin "W.S Stiles Memorial Lecture 2006: The Hungry Eye: Energy, Information and Retinal Function"
The batteries in our digital cameras and notebook computers constantly remind us that energy must be used to capture and process images. A retina is no exception. Work initiated in insect compound eyes reveals how eyes are designed to satisfy their hunger for information while keeping at bay thei...
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Eli Brenner "AVA Annual Meeting 2013: Visual and other Factors in the Timing of Interception"
In vivo recordings from primary visual cortex reveal that spontaneous background activity can be as complex as activity evoked by visual stimuli. Embedding visually evoked responses in such a strong and complex background seems like a confusing way to represent information about the visual world....
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Kathy Mullen "Fall Vision Meeting 2007: Color Processing in the Human LGN and Cortex measured with fMRI"
I will report on our results measuring the fMRI BOLD responses of the different cortical areas and the LGN to chromatic and achromatic stimuli. We used an fMRI (4T) experimental protocol that controls for attention and allows us to compare responses to L/M opponent (RG), S-cone (BY) and achromati...
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John Robson "Craik Club 2008: Application of Fourier Analysis to the Visibility of Gratings"
The contrast thresholds of a variety of grating patterns have been measured over a wide range of spatial frequencies Contrast thresholds for the detection of gratings whose luminance profiles are sine, square, rectangular or saw-tooth waves can be simply related using Fourier theory Over a wide r...
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Lothar Spillmann "ECVP 2007: Correlations between Visual Psychophysics, Neurophysiology and Art"
From the late sixties to the early nineties, the Pisa group led by Adriana Fiorentini and Lamberto Maffei pioneered research on the correlations between the psychophysics and neurophysiology of the visual system. Some 100 papers were published-in the very best journals- that drew international re...
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Dora Angelaki "Vision Sciences Society Annual Meeting 2013: Optimal Integration of Sensory Evidence: Building Blocks and Canonical Computations"
A fundamental aspect of our sensory experience is that information from different modalities is often seamlessly integrated into a uniļ¬ed percept. Recent computational and behavioral studies have shown that humans combine sensory cues according to a statistically optimal scheme derived from Bayes...
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Barry Lee "ICVS 2013: The Primate Visual Pathway and Color Vision: A Historical View"
A first suggestion as to chromatic coding in the visual pathway of primates was that the six layers of the lateral geniculate nucleus (LGN) was devoted to different cone types, one per eye per cone (Le Gros Clark, 1949); recent work on koniocellular laminae has suggested this principle is not so ...
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Johan Wagemans "AVA Christmas Meeting 2012: The Encoding of Parts and Wholes in the Visual Cortical Hierarchy"
With his famous paper on phi motion, Wertheimer (1912) launched Gestalt psychology, arguing that the whole is different from the sum of the parts. In fact, wholes were considered primary in perceptual experience, even determining what the parts are. Gestalt claims about global precedence and conf...
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John S. Werner "OSA Fall Vision Meeting 2013: Color Transformations Across the Life Span: Circuits to Compensation"
The lecture addresses two fundamental questions about color vision and aging. First, what are the mechanisms responsible for changes in chromatic sensitivity from infancy to old age? Psychophysical methods can be used to identify the optical and retinal origins of these changes, but also may serv...
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Dennis Levi "BCOVS 2013 Keynote: Removing the brakes on plasticity in the amblyopic brain"
In the last 10 years there has been a rekindling of interest in amblyopia; a new understanding of the underlying patho-physiology based in part on new brain imaging methods such as functional MRI, and a massive shift in our thinking about the treatment of amblyopia fueled in part by a number of i...