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  • 1
    Electronic Resource
    Electronic Resource
    Response properties of X and Y LGN neurons in Siamese cats (1984)
    Springer
    Experimental brain research 56 (1984), S. 235-242 
    Details
    ISSN: 1432-1106
    Keywords: Siamese cat ; Striate cortex ; Simple and complex cell ; Spatial frequency tuning ; Contrast response function
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We investigated quantitatively the receptive-field properties of neurons in the lateral geniculate nucleus of Siamese cats. The experimental animals, “Mid-western” Siamese cats, exhibited varied degrees of ocular misalignment. The percentage of Y-cells, which receive projections from the area centralis, was significantly greater in Siamese cats than in normally pigmented cats. The spatial resolution of many, but not all, X-cells within the central 5 degrees of Siamese cats was reduced. A substantial number of Y-cells had significantly longer latencies to stimulation of the optic chiasm. In addition, some Siamese cat units had abnormal contrast threshold and lineweighting functions along with large receptive field center size and weak inhibitory effects from the RF surround. Finally, large variability was found with respect to the abnormalities among cells within a given cat and more importantly among the individual Siamese cats which we studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00236279
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Spatial frequency tuning and contrast threshold of striate neurons in Siamese cats (1984)
    Springer
    Experimental brain research 56 (1984), S. 227-234 
    Details
    ISSN: 1432-1106
    Keywords: Siamese cat ; Striate cortex ; Simple and complex cell ; Spatial frequency tuning ; Contrast response function
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The spatial frequency tuning and the contrast-response function of striate neurons in Siamese cats were investigated with drifting sinusoidal gratings of high contrast, and the results were compared to the data obtained in normally pigmented cats. The optimal spatial frequency of the tuning curves obtained from Siamese cats was shifted toward lower values, and the mean optimal spatial frequency was significantly lower as compared to that measured in normal controls. Furthermore, the spatial resolution was severely reduced in Siamese cats, and many tuning curves in these animals showed unusually broad band width. The contrast response functions are characterized by higher contrast thresholds and shallower slopes in experimental animals. The units in Siamese cats had much larger receptive fields. Finally, these abnormalities were found in both simple and complex striate neurons. The present findings are discussed in terms of anomalies in pre-cortical visual neurons and their possible relation to the visual behavior of Siamese cats.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00236278
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Abnormal responses of retinal ganglion cells in Siamese cats to moving stimuli (1981)
    Springer
    Experimental brain research 43 (1981), S. 57-64 
    Details
    ISSN: 1432-1106
    Keywords: Siamese cat ; Optic Tract ; X and Y-retinal ganglion cells ; Moving Slits ; Response Properties ; Center/surround Interaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The responses of X and Y-Type retinal ganglion cells in Siamese cats to moving slits were compared to those in common cats, in order to assess the center/surround interactions in Siamese cat receptive fields. Responses in the latter animal were quantitatively lower than those in common cats, the RF centers were larger, and the encounter rate for Y-type optic tract fibers was significantly lower than in common cats. Whereas response enhancement of common cat units was predictable following masking of the surround, such an effect could only be observed in Siamese cats when the contrast between the stimulus and background was increased considerably. These data suggest anomalous center/surround interactions in Siamese cats, probably due to the presence of weaker surround influences in that animal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00238809
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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