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  • 1
    Digitale Medien
    Digitale Medien
    Effects of repetitive transcranial magnetic stimulation over dorsolateral prefrontal and posterior parietal cortex on memory-guided saccades (1998)
    Springer
    Experimental brain research 118 (1998), S. 197-204 
    Details
    ISSN: 1432-1106
    Schlagwort(e): Key words Transcranial magnetic stimulation ; Prefrontal cortex ; Parietal cortex ; Saccades ; Working memory
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  We investigated the role of the dorsolateral prefrontal cortex (DLPFC) and the posterior parietal cortex (PPC) in a visuospatial delayed-response task in humans. Repetitive transcranial magnetic stimulation (20 Hz, 0.5 s) was used to interfere temporarily with cortical activity in the DLPFC and PPC during the delay period. Omnidirectional memory-guided saccades with a 3-s delay were used as a quantifiable motor response to a visuospatial cue. The question addressed was whether repetitive transcranial magnetic stimulation (rTMS) over the DLPFC or PPC during the sensory of memory phase affects accuracy of memory-guided saccades. Stimulation over the primary motor cortex served as control. Stimulation over the DLPFC significantly impaired accuracy of memory-guided saccades in amplitude and direction. Stimulation over the PPC impaired accuracy of memory-guided saccades only when applied within the sensory phase (50 ms after cue offset), but not during the memory phase (500 ms after cue offset). These results provide further evidence for a parieto-frontal network controlling performance of visuospatial delayed-response tasks in humans. It can be concluded that within this network the DLPFC is mainly concerned with the mnemonic respresentation and the PPC with the sensory representation of spatially defined perceptual information.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002210050272
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  • 2
    Digitale Medien
    Digitale Medien
    Schumpeterian competition in heterogeneous oligopolies (1996)
    Springer
    Journal of evolutionary economics 6 (1996), S. 411-423 
    Details
    ISSN: 1432-1386
    Schlagwort(e): JEL-Classification: L13 ; O31 ; Key words: Evolutionary economics  ;  Schumpeterian competition  ;  Innovation  ; Oligopoly
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Wirtschaftswissenschaften
    Notizen: Abstract. The modeling of Schumpeterian competition as a process of innovation, imitation and selection was first presented by Nelson/Winter (1982) in a simulation study and further analyzed in a similar but general analytical formulation by Iwai (1984a, 1984b). Their results concerning the relations between the combination of the different forces of Schumpeterian competition and market structure respectively the distributions of profits are interesting, but restricted to competitive markets. Comparing rules of thumb and satisficing for the Ramp;D decisions the present study analyzes the process of Schumpeterian competition in a heterogeneous oligopoly. Firstly, the authors find for the Ramp;D-concentration relation results contrary to the traditional interpretation of Schumpeter. Secondly, Iwai’s (1984a, 1984b) qualitative results hold in this less restrictive modeling.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s001910050030
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