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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Biological cybernetics 61 (1989), S. 295-302 
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract This paper describes segmentation phenomena of superimposed textures and the Linking phenomena. These phenomena provide us with information about the mechanism of a late stage of segmenting textures. The late stage takes place after the segmentation process forms regions in feature maps such that parameter values in one region are substantially different from those in the neighboring regions. At the stage, the segmentation process merges the regions across the feature maps to determine output regions by integrating information about how the regions occupy two-dimensional space. The segmentation process gets such information both from local areas and from areas far away from the local areas where it determines the output regions and boundaries.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Experimental brain research 22 (1975), S. 281-294 
    ISSN: 1432-1106
    Keywords: Ventrobasal thalamus ; Cutaneous sensation ; Kinesthesia ; Pyramidal tract control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In the thalamic ventrobasal complex (VB) of the cat, effects of electrical stimulation of the pyramidal tract (PT) upon activities of 112 relay cells and 18 internuncial cells were examined. Single PT shocks to the cerebral peduncle elicited short-latency discharges in 31 relay cells (mean latency, 1.4±0.5 msec). When weak PT stimuli were employed as conditioning shocks, facilitatory effects upon responses to medial lemniscal (ML) stimulation were observed. It was revealed that VB relay cells were excited monosynaptically via collaterals of the fast PT fibers. Among 31 PT-excited cells 22 were fired by movements of joints (joint-movement units) and they made up 88% of all the joint-movement units. A majority of the relay cells responding to stimulation of hairs (hair units) did not receive excitatory effects from PT, except some special ones which represented long hairs at the distal or proximal end of the forearm-forepaw. In 44 relay cells repetitive PT shocks suppressed both evoked responses to ML stimulation and spontaneous discharges for 70–100 msec. Of these, 34 were hair units. The PT-induced inhibition in the hair units increased as their receptive fields shifted from the trunk towards the digits. Some intracellular recordings showed that the PT-induced inhibition was due to IPSPs generated disynaptically. Among 18 interneurons presumed to be inhibitory 10 responded with short latencies to PT stimulation. These were mostly the interneurons which presumably subserve the recurrent collateral inhibition in VB.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Experimental brain research 18 (1973), S. 531-547 
    ISSN: 1432-1106
    Keywords: Visual neurones ; Superior colliculus ; Binocular interaction ; Chronic cats
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Effects of monocular and binocular stimulations upon cells of the superficial layer (superficial grey and optic strata) of the superior colliculus (SC) were studied in chronic cats with painless head fixation. They responded vigorously to moving stimuli (a 2° wide black stripe or a light slit of the same width, both moving at 40–100°/sec). Most cells were directionally selective and binocularly driven usually with a contralateral ocular dominance. In a sample of 71 cells the five types of binocular interaction were found. In 36 units (50.7%) the response to binocular stimulation was larger than the sum of the responses to monocular stimulation of both eyes (facilitation) and in 12 units (16.7%) the reverse was true (occlusion). In 7 units (9.9%) the binocular response was equal to the sum of the two monocular responses (summation). In 11 units (15.5%) the binocular response was smaller than the response to dominant eye stimulation (inhibition). In 5 units (7.0%) whose background discharges were suppressed by monocular stimulation of one eye or both suppression became less marked for binocular stimulation (disinhibition). The most common type of binocular interaction was facilitation in the units with a clear ocular dominance and it was summation or occlusion in the units lacking ocular dominance. Facilitatory and inhibitory binocular interactions were more frequently seen in the directionally selective units than in the directionally non-selective ones
    Type of Medium: Electronic Resource
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