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  • 1
    Electronic Resource
    Electronic Resource
    Abnormal orientation selectivity in both eyes of strabismic amblyopes (1979)
    Springer
    Experimental brain research 37 (1979), S. 187-191 
    Details
    ISSN: 1432-1106
    Keywords: Amblyopia ; Grating adaptation ; Orientation selectivity ; Visual acuity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In normal observers preadaptation to a parallel grating increases the contrast threshold for a line whereas a perpendicular grating has no effect. Such orientation selectivity was not found in the amblyopic eye of two out of five squinters. Only a weak after-effect produced with a grating parallel to the line was obtained in the good eye of four of the amblyopes while all of them show an abnormal threshold reduction following adaptation to a perpendicular grating. This suggests a relationship between abnormal binocular interaction during visual development and the organization of orientational mechanisms but does not explain the loss of visual acuity in amblyopia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01474265
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Insensitivity of peripheral vision to spatial phase (1981)
    Springer
    Experimental brain research 43 (1981), S. 111-114 
    Details
    ISSN: 1432-1106
    Keywords: Peripheral vision ; Contrast sensitivity ; Motion detection ; Spatial phase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Tolhurst (1973) had suggested that movement-sensitive mechanisms were the human analogues of transient (Y) neurones in the cat (Enroth-Cugell and Robson 1966) and monkey (Gouras 1968) visual system. We challenged this view in a previous study (Rentschler et al. 1981): in strabismic amblyopia the detection of apparent movement of counterphased gratings is impaired considerably more than pattern detection, whereas no such anomaly is found when the sensitivity to temporal transients is tested. This would imply that with a grating target the detection of lateral movement and of transients is not mediated by the same class of mechanisms. Moreover, we have shown that normal peripheral vision suffers qualitatively from the same kind of movement insensitivity as the amblyopic eye. In this study, we have used a wider range of stimulus parameters to seek more definite evidence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00238818
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Myopic and strabismic amblyopia: Substantial differences in human visual development (1977)
    Springer
    Experimental brain research 30 (1977), S. 445-446 
    Details
    ISSN: 1432-1106
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00237268
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Amblyopic processing of positional information. Part I: Vernier acuity (1985)
    Springer
    Experimental brain research 60 (1985), S. 270-278 
    Details
    ISSN: 1432-1106
    Keywords: Amblyopia ; Vernier acuity ; Positional information ; Visual plasticity ; Alteration of perception
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Psychometric functions for the recognition of vernier displacements have been measured in 6 strabismic amblyopes, 1 anisometropic amblyope, and 1 bilateral amblyope of unknown aetiology. In the non-amblyopic eyes of the 7 unilateral amblyopes the mean threshold vernier offset was about half of that of a group of 7 experienced normal observers. No correlation was found between vernier acuities and Snellen acuities in the abnormal eyes of squinters. These eyes also displayed massive distortions of horizontal spatial values causing perceptual distortions. In all but one of the amblyopic eyes tested hyperacuity virtually disappeared at the brief exposure duration of 50 ms. None of the observed effects could be predicted from the amblyopic contrast sensitivities, grating resolutions, or letter acuities. This suggests that the loss of positional information is an independent and most significant feature of amblyopic visual dysfunction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00235921
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Illusions of filled lateral and angular extent (1981)
    Springer
    Experimental brain research 44 (1981), S. 154-158 
    Details
    ISSN: 1432-1106
    Keywords: Geometrical illusions ; Lateral inhibition ; Orientation analyzers ; Length estimation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The common principle of the illusions found by Helmholtz and Botti is the overestimation of a filled extent. They differ in that Helmholtz's illusions of filled angular extent can be accounted for in terms of spatial two-line interactions, whereas Botti's illusions of filled lateral extent cannot. The former observation is consistent with the assumption of interacting orientation-detectors in the visual cortex. The Botti illusion probably depends on global computation in the visual system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00237336
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    Paper (German National Licenses)
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  • 6
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    A possible basis for individual differences in magnitude-estimation behaviour (1974)
    London, etc. : Periodicals Archive Online (PAO)
    British journal of psychology. 65 (1974) 85 
    Details
    ISSN: 0007-1269
    Topics: Psychology
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:0047-1974-065-00-000010
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Segregation of color and form (1989)
    Springer
    Naturwissenschaften 76 (1989), S. 479-480 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00366230
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    Paper (German National Licenses)
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