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  • 1
    Electronic Resource
    Electronic Resource
    Response properties of neurons in the visual cortex of the rat (1984)
    Springer
    Experimental brain research 53 (1984), S. 374-383 
    Details
    ISSN: 1432-1106
    Keywords: Visual cortex ; Visual field properties ; Rat ; Vision
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Response properties of neurons in the visual cortex, area 17, of Long Evans pigmented rats were investigated quantitatively with computer-controlled stimuli. Ninety percent of the cells recorded (296/327) were responsive to visual stimulation. The majority (95%, 281/296) responded to moving images and were classified as complex (44%), simple (27%), hypercomplex (13%) and non-oriented (16%) according to criteria previously established for cortical cells in the cat and monkey. The remaining 5% of the neurons responded only to stationary stimuli flashed on-off in their receptive field. Results of this study indicate that neurons of the rat visual cortex have properties similar to those of cells in the striate cortex of more ‘visual’ mammals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00238168
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Visual cortical projections to the paraflocculus in the rat (1983)
    Springer
    Experimental brain research 49 (1983), S. 55-67 
    Details
    ISSN: 1432-1106
    Keywords: Visual cortices ; Paraflocculus ; Current stimulation ; Electrophysiology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The visual cortex of the rat was electrically stimulated with monopolar tungsten electrodes to determine the response properties of single neurons in the parafloccular lobule of the cerebellum. Following stimulation of the contralateral visual cortex, mossy fiber (MF)-evoked responses were indicated in 80 of 91 cells (88%) by activation of single or double spike potentials at latencies of 6–16 ms followed by an inhibition in simple spike frequency. MF activations were further identified by the demonstration of graded responses with increasing stimulus intensity and by following stimulus frequencies up to 20 Hz. Fifteen percent (9/61) of identified Purkinje cells in the parafloccular lobule demonstrated activation by climbing fiber excitations, as identified by the characteristic all-or-none burst response, which were evoked at variable latencies between 15–31 ms and 68–115 ms. Experiments involving stimulation of the superior colliculus and lesioning of the cerebral peduncle suggest that the visual cortical projection to the paraflocculus is mediated by the cortico-ponto-parafloccular pathway rather than relayed through midbrain nuclei. The electrophysiologic evidence suggests that the paraflocculus is a major receiving lobule of the cerebellum for inputs from the visual cortices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00235541
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The auditory corticopontocerebellar projection in the rat: inputs to the paraflocculus and midvermis. An anatomical and physiological study (1985)
    Springer
    Experimental brain research 59 (1985), S. 36-49 
    Details
    ISSN: 1432-1106
    Keywords: Auditory cortices ; Paraflocculus ; Cerebellum ; Corticocerebellar pathways
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary This study investigated afferent projections to the cerebellum, in particular those from the auditory cerebral cortex. The parafloccular lobule of the rat cerebellum is shown to be a primary target for the auditory cortical information with the midvermal region being a receiving area from the inferior colliculus. The method of anterograde transport of tritiated amino acids was employed to determine projections of the auditory cortex to the pons. Autoradiography showed that the site of termination of efferents from the auditory cortex corresponds to the location of neurons that project to the paraflocculus. Histogram analysis of neuronal activity in halothane anesthetized rats was employed to determine the response characteristics of neurons in paraflocculus and midvermis following cortical and tectal electrical stimulation. In addition, unit recordings of parafloccular neurons in immobilized, locally anesthetized animals demonstrated general characteristics of the responses of these neurons to auditory field stimulation. Electrical stimulation of the auditory cortex evoked mixed, excitatory-inhibitory and pure inhibitory mossy fiber responses in 33% of neurons in the paraflocculus, with no responses evident in the midvermis. Following inferior collicular stimulation, 12.6% of the neurons in the midvermis elicited a response. Recordings from parafloccular neurons in unanesthetized, immobilized rats showed evidence for excitatory and inhibitory mossy fiber responses, following auditory field stimulation. This spectrum of basic studies establishes the existence of a pathway in which the paraflocculus is revealed as an integrating target for cortical auditory information.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00237663
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Subcortical projections to layer I of the visual cortex, area 17, of the rat (1981)
    Springer
    Experimental brain research 41 (1981), S. 184-187 
    Details
    ISSN: 1432-1106
    Keywords: Visual cortex ; Layer I ; Afferent connections ; HRP ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The afferent connections to layer I of the visual cortex, area 17, of the albino rat were studied using the retrograde transport of horseradish peroxidase (HRP). In all animals examined, the majority of labeled cells were observed in the dorsal lateral geniculate nucleus and in the lateral posterior nucleus. In addition, in one-half of the animals examined labeled cells were also present in the posterior complex of the thalamus and in the ventromedial nucleus. Finally, in three cases a few HRP-positive neurons were observed in the locus coeruleus and in the dorsal raphe nucleus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00236607
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    Paper (German National Licenses)
    Fulltext
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