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  • 1
    Electronic Resource
    Electronic Resource
    Evidence for the role of post-retinal processes in simultaneous contrast (1973)
    Springer
    Psychological research 36 (1973), S. 1-12 
    Details
    ISSN: 1430-2772
    Source: Springer Online Journal Archives 1860-2000
    Topics: Psychology
    Notes: Summary Evidence is presented that the degree of simultaneous contrast produced by the bisecting line in the Koffka ring is greatly lessened by varying the perceived depth interval between this line and the Koffka figure. The retinal disparity between the line and the figure was varied to produce this effect. The slight lateral displacements of the bisecting line in the monocular images themselves necessary to produce retinal disparity with binocular viewing had no effect on the magnitude of simultaneous contrast. Interpretations based on processes operating at the retinal level such as lateral inhibition level are not supported by this finding. The results are interpreted in terms of the adjacency principle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00424650
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Spatial and fixation conditions affecting the temporal course of changes in perceived relative distance (1976)
    Springer
    Psychological research 39 (1976), S. 99-112 
    Details
    ISSN: 1430-2772
    Source: Springer Online Journal Archives 1860-2000
    Topics: Psychology
    Notes: Summary The results of two experiments are reported in which the change over time in the perceived depth location of a monocular, luminous test object with respect to two binocular luminous stimuli located at different distances was measured. It was found that: 1) The test object receded perceptually in depth over time achieving a stable location in space after 4 min of viewing. 2) The initial perceived location in depth of the test object depended upon which of the two binocular objects was fixated. When the farther binocular object was fixated the test object appeared further away than when the nearer one was fixated. 3) The size of the further binocular object also affected the initial perceived location of the test object. When it was larger, the test object appeared further away than when it was smaller. 4) There was an interaction between the binocular object fixated upon and the lateral separation between it and the test object: the smaller the separation, the greater the fixation effect. These results were accounted for in terms of the equidistance tendency, the depth adjacency principle, and a possible attentional factor. Taken together the results indicate that while reduced viewing conditions reduce the available stimulus information, they do not reduce the organizational options of the visual system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00309818
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Development of dynamic vision based on motion contrast (1999)
    Springer
    Experimental brain research 124 (1999), S. 469-473 
    Details
    ISSN: 1432-1106
    Keywords: Key words Form from motion ; Visual development ; Visual acuity ; Human
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  The development of dynamic vision was investigated in 400 healthy subjects (200 females and 200 males) aged between 4 and 24 years. The test consisted of a computer-generated random-dot kinematogram in which a Landolt ring was briefly presented as a form-from-motion stimulus. Motion contrast between the ring and background was varied in terms of the percentage of dots moving coherently within the ring in four levels (100%, 50%, 30%, and 20%). The subject’s task was to indicate the position of a gap in the ring (left, right, top, bottom). Results show a clear increase in performance with age for all motion contrast levels, with the greatest changes for the lowest levels. Adult performance was reached at the age of 15 years. Luminance-based static acuity measured with the Landolt test was poorly correlated with acuity for its form-from-motion analogue.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002210050642
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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