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  • 1
    Digitale Medien
    Digitale Medien
    Brain activity related to serial cognitive performance resembles circuitry of higher order motor control (1996)
    Springer
    Experimental brain research 109 (1996), S. 136-140 
    Details
    ISSN: 1432-1106
    Schlagwort(e): Cognitive performance ; Positron emission tomography ; Supplementary motor area ; Parietal cortex ; Human
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Differences between two states of cerebral activation were studied in eight subjects by positron emission tomography (PET) of regional cerebral blood flow (rCBF) and subsequent statistical parameter mapping. Subjects had to respond to a row of numbers presented on tape. In one condition they had to repeat each number. In the other condition the last heard number had to be added to the number presented before. Cerebral activity specifically related to the serial addition task was distributed over supplementary motor area (SMA), left premotor cortex and superior dorsal parietal cortex bilaterally, without significant involvement of prefrontal cortex. This indicated circuitry related to mental performance characterised by a fixed strategy of executing serial manipulation of numbers within “internal space”. The main aim of this communication is to discuss the similarity between circuitry underlying higher order motor control and pure cognitive performance.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00228634
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    A comparison of the sensitivity of PET and NMR for in vivo quantitative metabolic imaging (1985)
    Springer
    European journal of nuclear medicine 11 (1985), S. 73-75 
    Details
    ISSN: 1619-7089
    Schlagwort(e): Metabolic imaging ; PET ; NMR
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Using positron emission tomography (PET) in combination with compounds labelled with positron-emitting radionuclides like 11C, 13N and 15O, it is possible to study metabolism in vivo in a non-invasive way. Nuclear magnetic resonance (NMR) imaging takes advantage of the spin of protons in water molecules to measure both their number and relaxation times in vivo, but is, in principle, not limited to protons and can also be used for other nuclei with a non-zero spin, e.g. 13C and 31P. The use of 13C opens the possibility of studying the metabolism of a large number of compounds. In order to choose the appropriate methodology for metabolic imaging, i.e. PET or NMR, it is important to know the sensitivity of each modality. The present study outlines the sensitivity of both techniques.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00252137
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