G. Westheimer

Publications330
h-index67
Citations15,768
Highly Influential Citations719
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Improvement in visual sensitivity by changes in local context: Parallel studies in human observers and in V1 of alert monkeys
To explore the role of primary visual cortex in contour integration, we measured the contextual sensitivity of human contrast thresholds and of superficial layer complex cells in monkey V1. An… Expand
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Spatial distribution of contextual interactions in primary visual cortex and in visual perception.
To examine the role of primary visual cortex in visuospatial integration, we studied the spatial arrangement of contextual interactions in the response properties of neurons in primary visual cortex… Expand
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Dynamics of spatial summation in primary visual cortex of alert monkeys.
TLDR
We found that even the most conventional measures of receptive field (RF) size were not fixed, but could vary depending on stimulus contrast and foreground-background relationships. Expand
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Spatial configurations for visual hyperacuity
Abstract The threshold for discrimination of relative position of two features in the fovea is lowest—a few sec of arc—when the two features are separated by 2–5′ arc. and is not significantly… Expand
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Disjunctive eye movements
Eye movements may be described in terms of two components: conjugate and disjunctive. A pure conjugate eye movement is one in which the two eyes move in a parallel fashion, while in a disjunctive… Expand
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Visual acuity in the presence of retinal-image motion.
Resolution thresholds for Landolt C's and for vernier targets remain the same whether the target is stationary or moving with horizontal or vertical velocities of up to 2.5 degrees for foveal… Expand
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Fluctuations of accommodation under steady viewing conditions
It is well known that under steady environmental conditions motor systems exhibit residual fluctuations or unrest. The tremor in skeletal muscles has been extensively studied and shows a dominant… Expand
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Perceptual learning of spatial localization: specificity for orientation, position, and context.
Discrimination of simple visual attributes can improve significantly with practice. We have trained human observers to perform peripherally presented tasks involving the localization of short line… Expand
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The spatial grain of the perifoveal visual field
Measurements for normal human photopic vision in the fovea and in 2.5, 5 and 10 degree positions in the periphery reveal that hyperacuity thresholds rise faster with eccentricity than visual… Expand
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Spatial integration and cortical dynamics.
Cells in adult primary visual cortex are capable of integrating information over much larger portions of the visual field than was originally thought. Moreover, their receptive field properties can… Expand
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