Electrophysiological evidence for the existence of orientation and size detectors in the human visual system
F. W. Campbell,L. Maffei +1 more
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TLDR
The evoked potential in response to a grating alternating in phase at 8 c/s was recorded as a function of contrast from the occiput of man.Abstract:
1 The evoked potential in response to a grating alternating in phase at 8 c/s was recorded as a function of contrast from the occiput of man
2 It was found that a linear relation exists between the log of contrast and the amplitude of the evoked potential
3 Extrapolation to zero amplitude voltage of the regression line between the amplitude of the evoked potential and log contrast predicts the psychophysical threshold This law was found to hold over the wide range of spatial frequencies tested
4 Below 3 c/deg the results are best fitted with two regression lines; one of these is generated from the foveal and the other from the parafoveal representation in the cortex
5 The slope of the regression lines was found to be almost independent of either the spatial frequency or the area of the stimulus grating
6 The slope of the regression lines could be markedly increased by using as a stimulus either two different spatial frequencies, or two different orientations, presented simultaneously
7 Using the evoked potential the selectivity to orientation was found to be so high that a channel was not influenced by another orientation 15° away
8 The channels selectively sensitive to spatial frequency were highly selective and were not influenced by another spatial frequency one octave removed in spatial frequency
9 It is concluded that in man there exist neurones highly selective to both orientation and spatial frequencyread more
Citations
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Proceedings ArticleDOI
Visual evoked potential measurement of contrast sensitivity in a case of retinal laser injury reveals visual function loss despite normal acuity
Randolph D. Glickman,Joseph M. Harrison,Harry Zwick,Harold G. Longbotham,Charles S. Ballentine,Bennie Pierce +5 more
TL;DR: Data indicated that contrast sensitivity measurements may reveal alterations in visual neural processing mechanisms not detected with standard clinical tests of acuity, and may evaluate visual mechanisms that do not directly subserve acuity.
Book ChapterDOI
The Concept ‘Receptive Field’
TL;DR: In this paper, Eberhardt Dodt asked me to provide an Introduction to this meeting and gave me a free hand in the choice of a subject and was very touched by his courtesy and kind loyalty in remembrance.
Journal ArticleDOI
The Jitter Spatial Frequency Sweep VEP: a new paradigm to study spatiotemporal development of pattern- and motion-processing mechanisms in human infants
TL;DR: The Jitter Spatial Frequency (JSF) Sweep VEP as discussed by the authors sweeps can provide four useful estimates: (1,2) the high-SF cutoff of F1 and F2 responses estimates the spatial resolution of direction-selective (DS) and non-DS mechanisms, respectively; (3) the lowSF cutoff for F1 estimate the SF-boundary between mature (F1 absent) and immature (F 1 present) DS mechanisms; and (4) the F1 highSF cutoff estimates the lower velocity limit of cortical DS cells.
Book ChapterDOI
Binocular interactions in the visual evoked potential using a modified synoptophore
Vaegan U. Shoerey,J. H. Kelsey +1 more
TL;DR: This research aims to examine parameters relevant to standardized VEP tests of binocularity, especially in clinical cases in which binocularity has been disrupted, and evaluates how the pattern and temporal differences possible in the synoptophore affect these parameters.
Journal ArticleDOI
Neonatal Section of the Optic Chiasm Changes the Interhemispheric Transfer of Visual Information in Cats
TL;DR: It is concluded that the functional development of the interhemispheric connections can be modified by an early section of the optic chiasm and therefore the loss in binocular convergence can be partially compensated.
References
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Journal ArticleDOI
Receptive fields, binocular interaction and functional architecture in the cat's visual cortex
David H. Hubel,Torsten N. Wiesel +1 more
TL;DR: This method is used to examine receptive fields of a more complex type and to make additional observations on binocular interaction and this approach is necessary in order to understand the behaviour of individual cells, but it fails to deal with the problem of the relationship of one cell to its neighbours.
Journal ArticleDOI
Receptive fields and functional architecture of monkey striate cortex
David H. Hubel,Torsten N. Wiesel +1 more
TL;DR: The striate cortex was studied in lightly anaesthetized macaque and spider monkeys by recording extracellularly from single units and stimulating the retinas with spots or patterns of light, with response properties very similar to those previously described in the cat.
Journal ArticleDOI
Receptive fields of single neurones in the cat's striate cortex
David H. Hubel,Torsten N. Wiesel +1 more
TL;DR: The present investigation, made in acute preparations, includes a study of receptive fields of cells in the cat's striate cortex, which resembled retinal ganglion-cell receptive fields, but the shape and arrangement of excitatory and inhibitory areas differed strikingly from the concentric pattern found in retinalganglion cells.
Journal ArticleDOI
Application of fourier analysis to the visibility of gratings
F. W. Campbell,John G. Robson +1 more
TL;DR: The contrast thresholds of a variety of grating patterns have been measured over a wide range of spatial frequencies and the results show clear patterns of uniformity in the response to grating noise.
Journal ArticleDOI
Receptive fields and functional architecture in two nonstriate visual areas (18 and 19) of the cat.
David H. Hubel,Torsten N. Wiesel +1 more
TL;DR: To UNDERSTAND VISION in physiological terms represents a formidable problem for the biologist, and one approach is to stimulate the retina with patterns of light while recording from single cells or fibers at various points along the visual pathway.
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