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  • 1
    Electronic Resource
    Electronic Resource
    Simulated fovea of the human retina: psychophysical data confirming the model's ability to accurately predict resolution (1993)
    Springer
    Biological cybernetics 69 (1993), S. 475-484 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract A series of psychophysical tests were designed to determine whether a computer simulation of the human retina could accurately predict the geometry of various stimuli that were optimally resolved for human foveal vision. Stimuli were used that were of the order of the grain of the cone mosaic, i.e., of the order of 2 × 2′. In the first set of experiments, resolution was tested using a two-bar stimulus. In one experimental series the gap between the two bars was varied, and in a second series the gap was kept constant and the width of the bars varied. In a second set of experiments, various block letters and a number of series for each letter were used; in each experimental series a single parameter was systematically varied. The same stimuli were also used as inputs for the computer simulation. When proper controls were used, the psychophysical data and computer simulation gave remarkably comparable results. Care was taken to differentiate between simple detection of a pattern, and resolution, which involved proper identification of the image.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185419
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Dynamic complexity of visuo-motor coordination: an extension of Bernstein’s conception of the degrees-of-freedom problem (1996)
    Springer
    Biological cybernetics 75 (1996), S. 381-387 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract.  Extending Bernstein’s spatial conception of the degrees-of-freedom problem in the human motor system, we introduce a method developed from the theory of non-linear dynamics that allows one to quantify the spatio-temporal, i.e. dynamic, complexity of visuo-motor coordination. The correlation dimension D is used to measure the effective number of dynamic degrees of freedom in the coordination that a subject uses when performing a visuo-motor tracking task. The validity of the estimator employed is demonstrated. Visuo-motor coordination had a low-dimensional (mean D±SD=6.07 ±0.82) dynamic structure, which was consistent with deterministic chaos rather than with pure stochastic noise. D correlated with tracking performance, P. Both D and P were closely related to the degree of visuo-motor compatibility that the task presented to the subject. However, for short periods of training P increased, but D did not. As these seemingly contradictory results suggest, our dynamic conception of the degrees-of-freedom problem may reveal far more intricate visuo-motor interactions than Bernstein could identify on the basis of his spatial analyses of bodily movement patterns and by the methods of evaluation that were available to him at the time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004220050303
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Simulated fovea of the human retina: psychophysical data confirming the model's ability to accurately predict resolution (1993)
    Springer
    Biological cybernetics 69 (1993), S. 475-484 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract A series of psychophysical tests were designed to determine whether a computer simulation of the human retina could accurately predict the geometry of various stimuli that were optimally resolved for human foveal vision. Stimuli were used that were of the order of the grain of the cone mosaic, i.e., of the order of 2 × 2′. In the first set of experiments, resolution was tested using a two-bar stimulus. In one experimental series the gap between the two bars was varied, and in a second series the gap was kept constant and the width of the bars varied. In a second set of experiments, various block letters and a number of series for each letter were used; in each experimental series a single parameter was systematically varied. The same stimuli were also used as inputs for the computer simulation. When proper controls were used, the psychophysical data and computer simulation gave remarkably comparable results. Care was taken to differentiate between simple detection of a pattern, and resolution, which involved proper identification of the image.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00199447
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Photographic Cumulation of Recurrent Response Potentials (1961)
    [s.l.] : Nature Publishing Group
    Nature 189 (1961), S. 383-384 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] INTERMITTENT illumination of the human eye elicits a corresponding succession of response potential waves in the electroretinogram. Lord Adrian1 has shown that these waves have negative and positive components the form of which is related to the frequency and intensity of the stimulating flashes. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/189383a0
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Microphonic Potentials from Skin predict Inner Ear Defects in Cats (1970)
    [s.l.] : Nature Publishing Group
    Nature 228 (1970), S. 1212-1213 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The lock-in amplifier, also called a phase sensitive detector, phase lock detector or coherent detector, is a device designed to detect and measure electrical signals of known frequency that are buried in high amplitude background noise3. The detection is accomplished by two steps: noise which is ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2281212a0
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    Paper (German National Licenses)
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  • 6
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    Unknown
    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)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Not seeing eye to eye (1994)
    [s.l.] : Nature Publishing Group
    Nature 370 (1994), S. 259-260 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] MODERN science is increasingly done by committee: credit and blame are spread over many authors, whose publications are a bland lowest-common-denominator of their opinions. In the nineteenth cen-tury, single authors were the norm and the level of their polemic can seem strange to modern eyes. This ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/370259a0
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Ambiguous cognitive contours (1976)
    [s.l.] : Nature Publishing Group
    Nature 261 (1976), S. 77-78 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] BRADLEY and Dumais1 have presented figures that induce ambiguous subjective contours, which tend to alternate between two (or more) perceived forms. Bradley and Dumais suggested that because these figures are not "stimulus-bound", they cannot be accounted for by a physiological model, but arise ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/261077d0
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Local suppression of alpha activity by pattern in half the visual field (1974)
    [s.l.] : Nature Publishing Group
    Nature 251 (1974), S. 412-414 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Briefly, Lippold's hypothesis states that alpha activity is found when the standing potential between the front and rear of the eye is modulated by eye movements (especially movements that are parallel to the optic axis) and by changes in the length, and therefore in the resistance, of the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/251412a0
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    Paper (German National Licenses)
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