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Functional magnetic resonance imaging of synesthesia: activation of V4/V8 by spoken words
In 'colored-hearing' synesthesia, individuals report color experiences when they hear spoken words. If the synesthetic color experience resembles that of normal color perception, one would predictExpand
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A common visual metric for approximate number and density
There is considerable interest in how humans estimate the number of objects in a scene in the context of an extensive literature on how we estimate the density (i.e., spacing) of objects. Here, weExpand
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A theory of the primitive spatial code in human vision
MIRAGE, a theory for the primitive coding of the (1D) spatial distribution of luminance changes by the human visual system is developed from a theoretical examination of the practical problemsExpand
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Biases and sensitivities in geometrical illusions
Psychometric functions were collected to measure biases and sensitivities in certain classical illusory configurations, such as the Müller-Lyer. We found that sensitivities (thresholds or justExpand
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Transducer model produces facilitation from opposite-sign flanks
Small spots, lines and Gabor patterns can be easier to detect when they are superimposed upon similar spots, lines and Gabor patterns. Traditionally, such facilitation has been understood to be aExpand
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The Role of Target Salience in Crowding
We studied ‘crowding’ in the parafovea using orientation identification of a Gabor target as the task, and flanking Gabors on an isoeccentric circle as distractors. Orientation-discriminationExpand
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The recognition and representation of edge blur: Evidence for spatial primitives in human vision
Experiments are reported that measure the precision with which observers can (a) discern the degree of blur of an edge, (b) distinguish between two different types of blur, and relate the locationsExpand
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Conditions for motion flow in dynamic visual noise
Abstract Dynamic visual noise was constrained to produce perceptually continuous unidirectional flow by plotting dots in pairs the members of which were consistently separated in time and in space.Expand
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The use of an implicit standard for measuring discrimination thresholds
We measured thresholds for comparing the separation between lines, using either the method of constant stimuli (MCS) or the method of single stimuli (MSS). In the MCS an explicit standard isExpand
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The visual computation of 2-D area by human observers
  • M. Morgan
  • Mathematics, Medicine
  • Vision Research
  • 1 September 2005
Normal human observers compared either the width, height or area of two simultaneously-presented shapes (the standard and the test), with a cue to indicate which decision had to be made. On 'area'Expand
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