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  • Monkeys  (2)
  • 23.20.ck  (1)
  • 25.70.Jj  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Cortical responses to light in unanesthetized monkeys and their alteration by visual system lesions (1969)
    Springer
    Experimental brain research 8 (1969), S. 19-36 
    Details
    ISSN: 1432-1106
    Keywords: Evoked responses ; Visual system ; Striate cortex ; Inferotemporal cortex ; Monkeys
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In unanesthetized rhesus monkeys, visual evoked responses were recorded and averaged from epidural electrodes over striate, prestriate, inferotemporal and frontal cortex before and after unilateral striate lesions, unilateral optic tract section and unilateral inferotemporal lesions. The early wavelets seen in the striate and prestriate responses were eliminated only by ipsilateral optic tract section or ipsilateral striate lesions. The slower components of the striate responses were drastically reduced by ipsilateral optic tract section. Contralateral optic tract section and striate ablation also reduced the amplitude of these components, but to a lesser extent. Whereas ipsilateral optic tract section markedly reduced the amplitude of the inferotemporal response, the most striking effect of ipsilateral striate ablation on this response was a reduction in its variability. The inferotemporal lesion had no effect on the striate responses. The results are related to the problems of visual input to cerebral cortex, the functions of the inferotemporal cortex and the effects of occipital damage in man.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00234923
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of foveal prestriate and inferotemporal lesions on visual discrimination by rhesus monkeys (1970)
    Springer
    Experimental brain research 11 (1970), S. 128-144 
    Details
    ISSN: 1432-1106
    Keywords: Monkeys ; Visual discrimination ; Temporal lobe ; Visual cortex
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Ablation of inferotemporal cortex in monkeys impairs visual discrimination learning, and inferotemporal cortex receives visual information from striate cortex by way of the circumstriate belt. Yet most previous studies have failed to find any discrimination impairment after partial ablations of the circumstriate belt. In this experiment severe impairments in post-operative acquisition and retention of visual discrimination problems were found after lesions of “foveal prestriate cortex”, i.e. the portion of the circumstriate belt which receives a projection from the cortical representation of the fovea in striate cortex and which lies, largely buried, in the ventrolateral portion of prestriate cortex. Although foveal prestriate lesions produced a greater impairment on individual pattern discrimination tasks than inferotemporal lesions, the opposite was true of concurrent visual discrimination tasks in which several different pairs of discriminanda are presented in each testing session until the animal learns to discriminate every pair. The results are related to a two-stage model of discrimination learning and it is suggested that foveal prestriate lesions impair visual attention or perception, whereas inferotemporal lesions disturb the associative or mnemonic stage of visual discrimination learning.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00234318
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    High spin states in the transitional nucleus88Mo (1992)
    Springer
    The European physical journal 342 (1992), S. 257-265 
    Details
    ISSN: 1434-601X
    Keywords: 21.60.Cs ; 23.20.Lv ; 25.70.Jj ; 27.50.+e
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The reaction58Ni(36Ar,α qρ)88Mo has been studied at 145 MeV beam energy. A detector array consisting of the OSIRIS spectrometer, four charged-particleΔE detectors and seven NE213 neutron detectors has been used to meaure the gamma radiation inγγ- and particle-γγ-coincidence mode. The level scheme of88Mo has been extended up to 11.6 MeV excitation energy and probable spin 23ħ; some 70 transitions and 40 levels have been identified. Spin assignments have been proposed on the basis of measured DCO ratios. Hartree Fock cranking calculations of the Total Routhians and shell model calculations of the high spin states are presented which imply near-sphericity of the yrast line up to the highest spins found. A classification of the high spin states according to their leading seniority is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01291507
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Heavy-ion in-beam studies of the nucleus87Nb (1991)
    Springer
    The European physical journal 340 (1991), S. 125-139 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.R ; 23.20.ck ; 27.50. + e
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract High spin states in the transitional nucleus87Nb up to 14 MeV excitation have been established for the first time via the reactions40Ca(50Cr, 3p)87Nb and58Ni (32S, 3p)87Nb. The87Nbγ-radiations have been identified throughγ-ray spectra taken in coincidence with the evaporation residues detected in the Daresbury recoil separator or with multiple proton emission. Gamma-gamma coincidences, DCO ratios,γ-ray angular distributions and lifetimes have been measured. A total of some 100 transitions have been placed into a level scheme comprising of sixty states. The one-quasiparticle (1qp) bands of either parity and several other band-like structures have been identified, some containing alignedg 9/2 nucleons. Moderately enhancedE2 in-band transitions of 13–48 W.u. as well as several weakE2 yrast transitions connecting bands with different quasiparticle numbers have been found. Similarities with respect to theN=46 isotones83Rb,84Sr,85Y,86Zr and88Mo are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01303824
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    Paper (German National Licenses)
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