Showing papers in "Vision Research in 1984"

TL;DR: The topographic organization of striate cortex in the macaque was studied using physiological recording techniques as mentioned in this paper, which facilitated the quantitative analysis of various features of the visual representation, including individual variability in these features as well as in the overall size of the cortex.

TL;DR: While the spatial determinants of velocity discrimination follow the change in resolution found with eccentricity, peripheral temporal sensitivity must be nearly equal to foveal temporal sensitivity.

TL;DR: It is concluded that the saccadic system response mode to double stimuli depends on interstimulus spacing and both types of response can be shown to exist with double stimuli confined to one visual half-field.

TL;DR: It is shown that the vast majority of primate striate cells respond to pure color stimuli, in addition to responding to luminance-varying stimuli, and in general, simple cells are color-selective whereas complex cells response to multiple color regions.

TL;DR: In this paper, the authors used dynamic random dot kinematograms whose elements took independent, random walks of constant step size; their directions of displacement were drawn from a uniform distribution, and the tendency to see global coherent flow along the mean of the uniform distribution varied with the range of the distribution.

TL;DR: The frequencies of the several droplet types in the retinas of different species suggests that these organelles respond readily to natural selection and may be involved in more than one function.

TL;DR: At low spatial frequencies the sensory fusion limit equals the upper disparity limit for stereoscopic depth perception which suggests that a common mechanism underlies these two phenomena.

TL;DR: The results can be explained in terms of the known properties of binocular rivalry and reinforce the hypothesis that rivalry acts nonselectively, independent of factors such as spatial frequency, luminance, or orientation.

TL;DR: Human orientation discrimination was measured for single long lines presented sequentially and properties of visual cortical cells suggest that cells similar to S cells of cat and monkey striate cortex, carry the neuronal representation used in the decision process.

TL;DR: Quadratic summation is presented as a rule that describes binocular contrast summation and provides a good, first-order account of binocular summation in contrast detection, contrast discrimination, dichoptic masking, contrast matching and reaction time studies.

TL;DR: It is concluded that binocular contrast summation decreases as background contrast rises, revealing a dependence of binocular summation on background contrast.

TL;DR: Anticipatory smooth eye movement velocity was predicted by a two-state Markov model developed by Falmagne et al. (1975) for similar sequential dependencies observed in a manual reaction-time task (button-pressing).

TL;DR: Properties of human spatial visual channels were studied in two-dimensional form by a signal detection masking paradigm and the evidence suggests that 2D spatial frequency channels can be described as elongated2D spatial wave-packets which crudely resemble optimal forms for joint information resolution in the 2 D spatial and 2D frequency domains.

TL;DR: The main findings were: in the central vision of both normal and amblyopic observers, un Referenced displacement are detected with an accuracy equal to the observer's grating acuity; in the normal periphery, unreferenced motion thresholds fall off at a slower rate than does grates acuity.

TL;DR: Increasing field size had the following effects: it increased Dmax, it decreased delta t (the processing time), it increased Vmax (the maximum velocity), and it increased the amount of sequential recruitment.

TL;DR: There is evidence based on immunocytochemistry and action spectra that at least some of the skin and pineal receptors contain visual pigments, but like those of the rods, these do not match the spectral quality of the environmental light.

TL;DR: Slit-lamp photographs from four human subjects, aged 11, 19, 29, and 45 were reanalyzed using computer-based digitization and curve-fitting methods in order to obtain more complete information on internal lens curvature changes during accommodation.

TL;DR: Compared unique and other constant hue loci measured at a fixed retinal illuminance for the same observers, unique hue and constant hue data agreed, implying that unique hues are not a linear transformation of color matching functions.

TL;DR: A new view of receptive field organization in the X-cell is led to: the center mechanism is spatially homogeneous in its dynamics whereas the surround mechanism are spatially inhomogeneous.

TL;DR: The first nondestructive method for measuring the refractive index of intact crystalline lenses based on the work of Chu and Barrell and Pask is described and it is shown that the rat crystalline lens has a smooth and almost parabolic distribution ofRefractive index.

TL;DR: The constraints on a set of channels that would be consistent with the results of several experiments on the temporal properties of the visual system are derived, and they can account for data on flicker matching, notch losses in modulation sensitivity, and changes of perceived temporal frequency with changes of modulation depth.

TL;DR: The failure of a subject with occipital damage to accurately localize comparable stimuli in her blind field implies that cross-integration of the visual fields in commissurotomy patients requires interactions between cortical and subcortical visual areas.

TL;DR: The dichroic properties of lutein, presumed to be the macular pigment, are demonstrated and the structure of Henle fiber membranes is discussed and a consequence of the pigment molecules being incorporated into the bilipid components of these membranes is shown.

TL;DR: Electroretinograms from rabbits and macaque monkeys after vitreal administration of 2-amino-4-phosphonobutyrate (APB), which selectively blocks light-responsiveness in retinal on-bipolar cells, are obtained in light of recent hypotheses about the cellular origins of the ERG.

TL;DR: High resolution proton magnetic resonance spectroscopy was used to reinvestigate the structure and relative proportions of rhodopsin's major and minor oligosaccharide chains and each helix was found to have one surface which is much more hydrophobic than the other.

TL;DR: Differential velocity detection in the fovea was measured over a wide range of velocities (0.25-256°/sec), differential thresholds were minimum (about 6%) for intermediate velocity values as discussed by the authors.

TL;DR: This model shows that four mechanisms are sufficient to predict contrast matches, but does not rule out the possibility of additional mechanisms or of small changes in the mechanism bandwidths.

TL;DR: Analysis of the results obtained at lower contrasts suggests that the major source of noise lies not in the amplification of the filters, but is due to the location of the centroids being distorted by spurious noise zero-crossings.

TL;DR: The range of spatial tuning for channels that process static and dynamic disparities was investigated in the central visual field by measuring stereoscopic thresholds as a function of the difference in size of spatially filtered bar-like patterns presented to the two eyes.

TL;DR: The salience hypothesis makes the hypothesis that objects appear at equal depths when they have equal salience, and accounts for a variety of depth interaction effects between test lines and adjoining features, such as one or more other lines and a lattice of dots with a disparity gradient.