Precision of Stereoscopic Settings as Influenced by Distance of Target from a Fiducial Line

Graham, C. H.; Riggs, Lorrin A.; Mueller, Conrad G.; Solomon, R. L.

doi:10.1080/00223980.1949.9915985

Cited by 12 publications

(6 citation statements)

References 2 publications

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“…Although the largest camera separation tested was 12.7 cm, results of Cole, et al's (1981) (Graham, et al, 1949). However, if this were the sole or In summary, results of Experiment One supported previous findings of practical advantages for using stereo TV to perform * tasks which require accurate scaling of depth dimensions in a remotely televised'environment.…”

Section: Haptic Adjustments Of Perceived Depth Intervalssupporting

confidence: 76%

Perception of Depth with Stereoscopic Combat Displays.

Nishijo¹

1986

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Section: Haptic Adjustments Of Perceived Depth Intervalssupporting

confidence: 76%

Perception of Depth with Stereoscopic Combat Displays.

Nishijo¹

1986

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“…The precision of the size cue to depth should not depend very strongly on the lateral separation between the cards. However, as has been shown by Graham, et al (1949) the precision of the stereopsis cue depends on the separation. According to Assumption 2, the size information should receive relatively more weight, the greater the lateral separation.…”

Section: The Weighting Assumptionmentioning

confidence: 83%

Figural after-effects: A psychophysical theory of the displacement effect.

Mm¹

1962

Canadian Journal of Psychology / Revue canadienne de psychologi

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MANY AFTER-EFFECT PHENOMENA have been reported since Purkinje (1825) and Addams (1834) independently rediscovered the after-effect of seen movement. After-effects were described before 1930 for such diverse perceptual spaces as auditory location (Flugel, 1921;Bartlett & Mark, 1922), repetition rate (Cathcart & Dawson, 1928), pitch (von Bekesy, 1929Cathcart & Dawson, 1929), colour (Cathcart & Dawson, 1929, and geometric size (Cathcart & Dawson, 1929). However, it awaited the now classic paper by Kohler and Wallach (1944) for interest in the problem to become widespread. Kohler and Wallach presented an ingenious theory based on the spread of currents which build up resistance to their own passage through the cortex. Many studies have tested predictions based on this theory of cortical satiation, and prediction has often proved satisfactory. However, some crucial experiments have given results at variance with the theory. Drastic changes in the gross electrical characteristics of the visual cortex have been produced, without apparent alteration in the visual function (Lashley, et al., 1951;. Ikeda and Obonai (1955a) reported die existence of a retroactive effect, in which the inspection figure follows the test figure in time. The displacements in the retroactive effect are of the same character as those in the ordinary after-effect. It is difficult to see how either of these observations can be reconciled with the basic premises of satiation theory.Other theories of the figural after-effects have been proposed (for example, Gibson, 1933;Osgood & Heyer, 1952;Obonai, 1954;Obonai, 1957;Yokose, 1954). Nevertheless, the recent reviews by Spitz (1958), McEwan (1958), andDay, et al. (1959), who did not consider the Japanese theories, agree that no satisfactory explanation exists for the figural after-effects. Both Japanese theories are restricted in application. That of Yokose appears, from the temporal relations found by Nozawa (1958), to deal only with neutralization effects, and that of Obonai seems not at present to be capable of quantitative prediction. Either or both of these theories may eventually prove compatible with the theory to be presented below. It is not suggested that the present paper gives a iDefence Research Medical Laboratories Project no. 250, DRML Report no. 250-3, H.R. no. 234.

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“…Suppose, however, also that the second man is standing 10 m to the side of the first as well as further away, then at 1000 m the visual angle separation between the two men will also be reduced to 1/10 of that at 100 m. There is evidence that, with the decrease in the visual-angle separation of contours whose relative distance is to be discriminated, the threshold value K O decreases in an approximately linear manner. This has been shown to be the case for stereoscopic acuity by Matsubayashi (1937) and by Graham et al (1949). It was also true, in at least one experimental condition used by Zegers (1948), for the absolute threshold for relative monocular movement parallax.…”

Section: A Psychophysical Metric For Visual Cuesmentioning

confidence: 69%