Showing papers in "Vision Research in 1971"

TL;DR: Subjects' eye movements were recorded while they viewed and then recognized patterns to reveal the sequence of internal processing, consistent with a serial theory of pattern learning and recognition previously proposed.

TL;DR: Two models of pattern vision were tested: a single-channel model in which pattern vision is a function of a single neural network and a multiple-channels model inWhich the stimulus information is processed by many channels, each sensitive to a narrow range of spatial frequencies.

TL;DR: It can be derived that protanopia and deuteranopia have to be characterized by complete absence of the R-resp.

TL;DR: Receptive fields of single optic nerve fibers in the cat have been subdivided into two types: Type I responds briskly to the abrupt change in the luminance of both a spot and diffuse light, but does not continue to respond to a stationary light stimulus, and Type II responds very weakly to diffuse light.

TL;DR: Visibility and visual conspicuity turned out to be linked by directed attention and were interpreted in terms of external and internal determiners of attention.

TL;DR: Under the best conditions, single ganglion cells of the cat's retina give one extra impulse for less than 3 quanta at the cornea, suggesting that when a single quantum is absorbed in the retina several extra impulses must be initiated.

TL;DR: Perceptual cues prevail over bias effects in eccentric vision, and bias effects occur towards letters that occur frequently in the printed language, but they are restricted to confusions.

TL;DR: Judgement of the vertical and horizontal orientation as measured by determining the Standard Deviation at a number of orientations is much more precise even when the cue of gravity is removed.

TL;DR: Cells in the superficial gray layer of the cat superior colliculus show binocular interaction and respond selectively to certain features of a visual stimulus, for example, movement, direction, and size.

TL;DR: These findings rule out the simple theory that turtles see color through the use of a single detector visual pigment coupled with a number of differently colored discriminator filters.

TL;DR: Electron micrographs of the dorsal lateral geniculate nucleus of cat and monkey demonstrate three major axon types and several “connectivity rules” that apply to both species and all laminae can be formulated.

TL;DR: The optical density curve of the macular pigment has been estimated for 49 European and West Indian subjects by comparing their foveal and extra-foveal spectral sensitivities measured by the flicker technique and no significant differences have been observed related to race, normal environment, age, colour of skin or colour of eyes.

TL;DR: The response characteristics of cat's optic nerve fibers to flicker stimulation were investigated and the average impulse frequency in Type II-fibers (tonic type) remains almost unchanged over a wide range of flicker frequencies.

TL;DR: Horizontal and amacrine cells of the retina of primates can be classified as a new type of nerve cell due to their structure, disposition in plexus and electrophysiological response, and a new cellular type has been seen in the cat's retina.

TL;DR: The upper layers of the superior colliculus of the adult rat have a set of characteristic and quantitatively stable synaptic features that have been studied during development and following deafferentation of the region.

TL;DR: The light transmission of freshly excised normal human lenses has been measured at five visible wavelengths and the lens profile has been recorded and used to calculate light loss per unit pathlength of lens which remains constant throughout the central 7–8 mm of the lens and between the ages of 20 and 60.

TL;DR: The authors question an inviolate interpretation of Hering's Law and discuss the mechanisms of the dysconjugacies in light of current concepts of the neurophysiology of eye movements.

TL;DR: Findings suggest that monkeys without striate area may still exhibit some of the approximate constancies which allow the perception of a structured visual space, provided that the peristriate and parastriate cortices are relatively preserved.

TL;DR: The results suggest that smooth eye movements may be a product of two processes, one which stabilizes images on the retina, and one which inhibits saccadic behaviour.

TL;DR: Modifications of prey-catching behavior induced by barriers, or during visual-cliff situations provide further evidence for visuomotor flexibility among anuran amphibians.

TL;DR: A series of experiments demonstrated that the flicker colors can be produced by appropriate changes in the intensity of a stationary light source if the intensity changes resemble those produced by a Benham Top.

TL;DR: The contrast sensitivity was measured under various conditions of fixation such as normal involuntary eye movements, tension tremor, post-rotational nystagmus, and the coarse stabilization of the rehnal image.

TL;DR: A single function relating absolute latency to intensity has been derived by a method based on a model of the effects of adaptation on the sensitivity of the Limulus visual receptor and suggests that the retinal process studied may be a receptor event.

TL;DR: A new map of visual areas I and II of the cat's cerebral cortex is presented in figurine style and the general plan of representation of the visual field, believed to be homologous with the suprasylvian sulcal area of Clare and Bishop, is illustrated for rabbit, cat and owl monkey.

TL;DR: Rushton's general kinetic equation for human cone pigments is tested by estimating the photolysis rate at equilibrium from the initial photolytic rate and comparing it to the equilibrium rate of regeneration measured immediately after the bleaching light is turned off, which confirms the validity of this equation.

TL;DR: The contrast threshold was measured psychophysically for a sinusoidal grating presented periodically with a variable temporal frequency for various parameters of patterns and the sum of certain spatial and temporal resolution indices was proportional to the logarithm of the contrast.

TL;DR: Extraretinal correction and memory for target position, suggesting corrective tendency of eye movements in dark, is suggested.

TL;DR: The hypotheses of Garten, Walls and Studnitz concerning the significance of the retinomotor responses are examined in the light of present knowledge and all three are found to be valid.

TL;DR: Hippus is described here as a sustained oscillation of the pupil, with a period of about 5 sec, with the amplitude about 1 mm, and the average diameter is decreased by 1–2 mm.