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111.
Banks EC 《Journal of the history of the behavioral sciences》2001,37(4):327-348
Although Ernst Mach is widely recognized in psychology for his discovery of the effects of lateral inhibition in the retina ("Mach Bands"), his contributions to the theory of depth perception are not as well known. Mach proposed that steady luminance gradients triggered sensations of depth. He also expanded on Ewald Hering's hypothesis of "monocular depth sensations," arguing that they were subject to the same principle of lateral inhibition as light sensations were. Even after Hermann von Helmholtz's attack on Hering in 1866, Mach continued to develop theories involving the monocular depth sensations, proposing an explanation of perspective drawings in which the mutually inhibiting depth sensations scaled to a mean depth. Mach also contemplated a theory of stereopsis in which monocular depth perception played the primary role. 相似文献
112.
113.
Mary E. Evans Ph.D. Steven M. Banks Ph.D. Steven Huz M.P.A. Thomas L. McNulty M.D. 《Journal of child and family studies》1994,3(2):225-234
Since 1988 New York State's Children and Youth Intensive Camse Management (CYICM) program has enrolled more than 1,700 children. The program goal is to maintain children in the least restrictive environment approriate to their needs. This linkagke and advocacy focussed program uses a small caseload and flexible service money to meet its goal. We review the program model, describe the enrolled children, highlight some of the problems associated with determining program outcomes, and present the outcomes related to hospitalization and community tenure. Using two analytic techniques, CYICM was shown to be associated with fewer hospital admissions and fewer days in the hospital over a two-year period following the intervention of CYICM than prior to enrollment. 相似文献
114.
When a small frontoparallel surface (a test strip) is surrounded by a larger slanted surface (an inducer), the test strip is perceived as slanted in the direction opposite to the inducer. This has been called the depth-contrast effect, but we call it the slant-contrast effect. In nearly all demonstrations of this effect, the inducer's slant is specified by stereoscopic signals; and other signals, such as the texture gradient, specify that it is frontoparallel. We present a theory of slant estimation that determines surface slant via linear combination of various slant estimators; the weight of each estimator is proportional to its reliability. The theory explains slant contrast because the absolute slant of the inducer and the relative slant between test strip and inducer are both estimated with greater reliability than the absolute slant of the test strip. The theory predicts that slant contrast will be eliminated if the signals specifying the inducer's slant are consistent with one another. It also predicts reversed slant contrast if the inducer's slant is specified by nonstereoscopic signals rather than by stereo signals. These predictions were tested and confirmed in three experiments. The first showed that slant contrast is greatly reduced when the stereo-specified and nonstereo-specified slants of the inducer are made consistent with one another. The second showed that slant contrast is eliminated altogether when the stimulus consists of real planes rather than images on a display screen. The third showed that slant contrast is reversed when the nonstereo-specified slant of the inducer varies and the stereo-specified slant is zero. We conclude that slant contrast is a byproduct of the visual system's reconciliation of conflicting information while it attempts to determine surface slant. 相似文献
115.
116.
We examined the ability to use optic flow to judge heading when different parts of the retina are stimulated and when the specified heading is in different directions relative to the display. To do so, we manipulated retinal eccentricity (the angle between the fovea and the center of the stimulus) and heading eccentricity (the angle between the specified heading and the center of the stimulus) independently. Observers viewed two sequences of moving dots that simulated translation through a random cloud of dots. They reported whether the direction of translation—the heading—in the second sequence was to the left or right of the direction in the first sequence. The results revealed a large and consistent effect of heading eccentricity: Judgments were much more accurate with radial flow fields (small heading eccentricities) than with lamellar fields (large heading eccentricities), regardless of the part of the retina being stimulated. The results also revealeda smaller and less consistent effect of retinal eccentricity: With radial flow (small heading eccentricities), judgments were more accurate when the stimulus was presented near the fovea. The variation of heading thresholds from radial to lamellar flow fields is predicted by a simple model of two-dimensional motion discrimination. The fact that the predictions are accurate implies that the human visual system is equally efficient at processing radial and lamellar flow fields. In addition, efficiency is reasonably constant no matter what part of the retina is being stimulated. 相似文献
117.
This article describes a laboratory computer system that uses a PDP-11/10 CPU and a graphics processor to simulate a multifield tachistoscope and to run a great number of psychological experiments. The potential of the hardware is discussed, and two useful programs are presented. 相似文献
118.
Horn and Hill (1969) and others have reported that a small number of units in the cat visual cortex undergo changes in receptive field orientation associated with body tilt. Such units reportedly compensate for tilt and may represent a mechanism for human orientation constancy. To test this, we measured meridional differences in visual acuity for head-vertical and head-tilted viewing conditions. The results of Experiment 1 did not directly support or refute the involvement of tilt-compensatory units. The results of Experiment 2, in which we controlled for countertorsion of the eyes, showed that meridional acuity differences correspond to the retinal and not the spatial orientation of the stimulus. We conclude that tilt-compensatory cortical units are not involved in human orientation constancy. The physiological evidence indicating the existence of tilt-compensatory units in the visual cortex is also reexamined. 相似文献
119.
120.
W P Banks H White W Sturgill R Mermelstein 《Journal of experimental psychology. Human perception and performance》1983,9(4):560-582
These experiments assess the degree to which the semantic-congruity effect in comparative judgment can be explained by such expectancy effects as priming, perceptual "set," or strategies used in the task. The first experiment mixed a lexical-decision task with the comparative-judgment task and showed that neither automatic semantic priming nor deliberate preparation can account for the congruity effect. Experiments 2-4 assessed expectancy effects in a different way by presenting the instructions for comparative judgment either before or after the pair to be judged. These experiments included, among other things, a number of safeguards against artifacts in this paradigm. In these three experiments the congruity effect was obtained with both orders of stimuli and instructions, contrary to the prediction of an expectancy hypothesis. The results indicate that when stimuli are not degraded. The semantic-congruity effect depends largely on the relation between the stimuli and the instructions and only to a small degree, if at all, on expectancy. 相似文献