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  • 1990-1994  (1)
  • 1985-1989  (3)
  • 1970-1974  (1)
  • 1
    Electronic Resource
    Electronic Resource
    The Role of Contours in Stereopsis (1973)
    [s.l.] : Nature Publishing Group
    Nature 242 (1973), 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] The problem is: what features of a pair of patterns can define the disparity that gives rise to the perception of stereopsis? We investigated whether disparity of visual texture is sufficient in itself to produce stereopsis using Fig. 1. Pickett6 found that (in random dot matrices) texture ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/242412a0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Relationship between orientation tuning and spatial frequency in neurones of cat area 17 (1985)
    Springer
    Experimental brain research 57 (1985), S. 628-631 
    Details
    ISSN: 1432-1106
    Keywords: Striate cortex ; Orientation tuning ; Spatial frequency ; Inhibition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The orientation bandwidth was measured at different spatial frequencies for simple and complex cells. With increasing spatial frequency, the orientation tuning of simple cells became progressively narrower. This tendency was much less marked in complex cells. The results are interpreted in support of geniculate cells with orthogonal orientation biases providing the excitatory and inhibitory inputs to a simple cell.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00237851
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Function of GABAA inhibition in specifying spatial frequency and orientation selectivities in cat striate cortex (1994)
    Springer
    Experimental brain research 98 (1994), S. 31-38 
    Details
    ISSN: 1432-1106
    Keywords: Striate cortex ; Spatial frequency tuning ; Orientation sensitivity ; Intracortical inhibition ; Bicuculline methiodide ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Responses of simple and complex cells in cat striate cortex were studied with moving sine-wave gratings before and during application of the GABAA receptor antagonist bicuculline methiodide. Both simple and complex cells exhibited a broadening of their spatial frequency tuning functions under bicuculline. This was especially evident at spatial frequencies lower than the ones the cell was responding to before the drug administration. The effects cannot be explained by response saturation and could be reversed by cessation of the iontophoresis. The results indicate that the band-pass response characteristics of the spatial frequency response functions of striate cells derive largely from intracortical inhibition. The findings have implications also for the orientation selectivity of cortical cells. Since many geniculate cells are tuned for stimulus orientation at higher spatial frequencies, suppression of the low-spatial-frequency component would remove some of the orientation non-specific response in striate cortical cells and contribute to their orientation selectivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00229106
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Space and spatial frequency: analysis and representation in the macaque striate cortex (1986)
    Springer
    Experimental brain research 64 (1986), S. 5-18 
    Details
    ISSN: 1432-1106
    Keywords: Striate cortex ; Fourier analysis ; Receptive fields
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Simple cells in the macaque striate cortex were tested with bars, edges and gratings. Spatial frequency tuning curves could be predicted from the spatial profiles plotted with bars and edges and the bandwidth could be evaluated more accurately by computing the mean from measured and predicted tuning curves. The results suggest that the mean relative spatial frequency bandwidth (Δf/fo) is nearly constant and of a moderate value. But at each optimal spatial frequency, cells with different bandwidths (about a factor of two) were recorded. The shapes of spatial response profiles resemble the corresponding spatial and spatial frequency characteristics of line and edge detectors evaluated psychophysically. Among the remaining cell types, concentric cells tend to be tuned to lower spatial frequencies and have broader bandwidths, whereas periodic cells prefer higher spatial frequencies and have narrower bandwidths. Thus the mean relative bandwidth tends to decrease significantly with spatial frequency (as required by a system of patch-by-patch Fourier analysis) only when cells with poor orientation selectivity and the non-linear silent periodic cells are included along with the simple cells. Simple cells, on their own, seem to form a quasi-linear contrast processing system which is more biased towards spatial accuracy than spatial frequency selectivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00238196
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    A model of striate response properties based on geniculate anisotropies (1987)
    Springer
    Biological cybernetics 57 (1987), S. 11-23 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract The orientation biases seen in the responses of cells in the retina and dLGN are dependent on the spatial frequency of the stimulus, being appreciable only at higher spatial frequencies. An inhibitory mechanism that suppresses the responses to low spatial frequencies would leave a striate cell receiving a biased geniculate input with an orientation sensitivity at the higher spatial frequencies. Such an inhibition could in fact come from one or a small group of LGN cells (through cortical interneurones), since their response extends to spatial frequencies much lower than for cortical cells at the same eccentricity. According to this scheme, a number of other striate response characteristics, e.g., their length and spatial frequency response functions, can also be explained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00318712
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    Paper (German National Licenses)
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