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  • Articles: DFG German National Licenses  (2)
  • 1985-1989  (2)
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  • Articles: DFG German National Licenses  (2)
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Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Electrophysiological assessment of the human depth-perception threshold (1987)
    Springer
    Graefe's archive for clinical and experimental ophthalmology 225 (1987), S. 429-436 
    Details
    ISSN: 1435-702X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The cortical response to stereoscopic stimuli was measured as a function of disparity using visual evoked potentials (VEP). The stereoscopic stimulus consisted of a dynamic random-dot pattern that portrayed a three-dimensional horizontal grating. Disparity of the grating was variable between 0 and 18 arc min, step size being 4.22 arc s. Evoked responses were recorded using a “random-sequence sweep technique.” The VEP amplitude increased approximately linearly with the logarithm of disparity and allowed an estimation of the stereo threshold by linear extrapolation. The evoked potential estimates of the stereo threshold of 16 subjects were compared to psychophysically obtained thresholds. Several threshold-estimation techniques are discussed. Evoked potential and psychophysical threshold estimates had the lowest discrepancy when the VEP amplitude was linearly extrapolated to the logarithmic disparity axis. The difference between the evoked potential estimate and the psychophysical threshold was less than 20% in 56% of all cases; 16 of 18 cases (89%) agreed within a factor of 2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02334171
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Retinal visual acuity with pattern VEP normal subjects and reproducibility (1986)
    Springer
    Graefe's archive for clinical and experimental ophthalmology 224 (1986), S. 160-164 
    Details
    ISSN: 1435-702X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Retinal visual acuity was determined using an objective method by means of VEP. Sixty subjects with subjective visual acuity ranging from 20/25 to 20/12 were measured with a computer-controlledlaser interferometer, using interference fringes modulated in counterphase as pattern-reversal stimulus. Steady-state VEPs taken at different spatial frequencies were evaluated byFourier analysis andlinear regression. Objective retinal acuity was calculated as the intersection between the linear regression line and the linear scaled spatial frequency axis. In 68% of all cases, the difference between objective and subjective visual acuity was less than ±5.1 cycles per degree (c/d) (±15.4% referred to subjective acuity); in 86%, the difference was less than ±7.7 c/d (±23.1%).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02141491
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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