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  • 1
    Digitale Medien
    Digitale Medien
    Convergence of parvocellular and magnocellular information channels in the primary visual cortex of the macaque (2002)
    Oxford, UK : Blackwell Science, Ltd
    European journal of neuroscience 16 (2002), S. 0 
    Details
    ISSN: 1460-9568
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: We investigated whether responses of single cells in the striate cortex of anaesthetized macaque monkeys exhibit signatures of both parvocellular (P) and magnocellular (M) inputs from the dorsal lateral geniculate nucleus (dLGN). We used a palette of 128 isoluminant hues at four different saturation levels to test responses to chromatic stimuli against a white background. Spectral selectivity with these isoluminant stimuli was taken as an indication of P inputs. The presence of magnocellular inputs to a given cortical cell was deduced from its responses to a battery of tests, including assessment of achromatic contrast sensitivity, relative strengths of chromatic and luminance borders in driving the cell at different velocities and conduction velocity of their retino-geniculo-cortical afferents. At least a quarter of the cells in our cortical sample appear to receive convergent P and M inputs. We cannot however, exclude the possibility that some of these cells could be receiving a convergent input from the third parallel channel from the dLGN, namely the koniocellular (K) rather than the P channel. The neurons with convergent P and M inputs were recorded not only from supragranular and infragranular layers but also from the principal geniculate input recipient layer 4. Thus, our results challenge classical ideas of strict parallelism between different information streams at the level of the primate striate cortex.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1460-9568.2002.02137.x
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  • 2
    Digitale Medien
    Digitale Medien
    The Role of Contours in Stereopsis (1973)
    [s.l.] : Nature Publishing Group
    Nature 242 (1973), S. 412-414 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [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 ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/242412a0
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  • 3
    Digitale Medien
    Digitale Medien
    Orientation specific colour adaptation at a binocular site (1976)
    [s.l.] : Nature Publishing Group
    Nature 261 (1976), S. 39-40 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] If only the monocular channels are colour coded, no aftereffect should be obtainable on viewing an achromatic test pattern, since the group of monocular neurones specific to any of the two orientations have been presented with both the complementary colours for equal periods of time. On the other ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/261039a0
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  • 4
    Digitale Medien
    Digitale Medien
    The fate of the Taj Mahal (1978)
    [s.l.] : Nature Publishing Group
    Nature 276 (1978), S. 208-208 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] SIR,-M. K. Agarwal has made a plea (2 November, page 10) that India should go ahead with the construction of the proposed oil refinery near the Taj Mahal and asks whether a poor nation can afford the luxury of keeping its monuments in their pristine beauty while it cannot provide a minimum for its ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/276208a0
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  • 5
    Digitale Medien
    Digitale Medien
    Possible plasticity in the rat superior colliculus (1978)
    [s.l.] : Nature Publishing Group
    Nature 275 (1978), S. 140-141 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] It has been shown in the mouse3 and the hamster4 that many neurones in the intermediate and deep layers of the optic tectum receive nonvisual sensory inputs. They respond either to somatic stimuli from fur or whiskers on the contralateral half of the body or to complex sounds from the contralateral ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/275140a0
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  • 6
    Digitale Medien
    Digitale Medien
    Release from inhibition reveals the visual past (1999)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 399 (1999), S. 422-422 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Prolonged viewing of a high-contrast repetitive pattern such as a grating leads to adaptation of the corresponding visual-processing channels. We have found that such viewing also leads to the short-term establishment of a subthreshold trace in the brain that can cause a visual illusion of the ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/20836
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  • 7
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): Striate cortex ; Orientation tuning ; Spatial frequency ; Inhibition
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00237851
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  • 8
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): Striate cortex ; Spatial frequency tuning ; Orientation sensitivity ; Intracortical inhibition ; Bicuculline methiodide ; Cat
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00229106
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  • 9
    Digitale Medien
    Digitale Medien
    Geniculate orientation biases seen with moving sine wave gratings: implications for a model of simple cell afferent connectivity (1984)
    Springer
    Experimental brain research 57 (1984), S. 196-200 
    Details
    ISSN: 1432-1106
    Schlagwort(e): Lateral geniculate nucleus ; Striate cortex ; Orientation sensitivity ; Sine wave gratings
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Orientation bias of cat dorsal lateral geniculate (LGN) neurones varied with the spatial frequency of a moving sine wave grating. At low spatial frequencies there was little orientation bias, whereas near the high-frequency limit, the dependence on orientation was marked. It is proposed that, if such cells were to drive the cortical inhibitory interneurones responsible for the orientation sensitivity of striate simple cells, it would explain many distinguishing features of cortical cells besides their orientation sensitivity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00231146
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  • 10
    Digitale Medien
    Digitale Medien
    Contribution of inhibitory mechanisms to the orientation sensitivity of cat dLGN neurones (1984)
    Springer
    Experimental brain research 55 (1984), S. 192-195 
    Details
    ISSN: 1432-1106
    Schlagwort(e): Lateral geniculate nucleus ; Orientation sensitivity ; GABA-mediated inhibition ; Bicuculline methiodide
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The effect of iontophoretically applied bicuculline methiodide, an antagonist of GABA-mediated inhibition, was tested on the responses of cat dLGN neurones to moving lines. Most geniculate neurones normally show an orientation bias when tested with slowly moving long lines. This sensitivity to the orientation of the line stimulus could be markedly reduced during iontophoretic application of bicuculline. It is concluded that the orientation bias shown by geniculate neurones is to a large extent due to intrageniculate GABAergic inhibition.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00240517
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