R
Ralph D. Freeman
Researcher at University of California, Berkeley
Publications - 155
Citations - 13958
Ralph D. Freeman is an academic researcher from University of California, Berkeley. The author has contributed to research in topics: Visual cortex & Receptive field. The author has an hindex of 57, co-authored 155 publications receiving 13442 citations. Previous affiliations of Ralph D. Freeman include Helen Wills Neuroscience Institute & University of California.
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Stereoscopic depth discrimination in the visual cortex: neurons ideally suited as disparity detectors
TL;DR: Results demonstrate that a specific type of cortical neuron exhibits the desired characteristics of a disparity detector, and includes a plausible hierarchical arrangement of cortical cells.
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Contrast gain control in the cat's visual system
TL;DR: The idea that the adaptation of cortical neurons to local contrast levels in a visual stimulus is functionally advantageous is examined, and contrast-response functions of cells in striate cortex are measured while systematically adapting them to different contrast levels of stimulus gratings.
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Length and width tuning of neurons in the cat's primary visual cortex
TL;DR: Results show that end- and side-inhibition tend to be strongest at the orientation and spatial frequency that yield maximal excitation, suggesting that inhibition is mediated by a pool of neurons.
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Receptive-field dynamics in the central visual pathways
TL;DR: The spatiotemporal RF structure of neurons in the lateral geniculate nucleus and primary visual cortex is discussed and the application of sophisticated RF-mapping techniques has enabled neurophysiologists to characterize RFs in the joint domain of space and time.
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Spatiotemporal organization of simple-cell receptive fields in the cat's striate cortex. I: General characteristics and postnatal development
TL;DR: This study has studied the spatiotemporal receptive-field structure of 233 simple cells recorded from the striate cortex of adult cats and kittens at 4 and 8 wk postnatal and examined the postnatal development of spatial and temporal selectivity in the frequency domain.