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  • 1
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    German Medical Science GMS Publishing House; Düsseldorf
    In:  69. Jahrestagung der Deutschen Gesellschaft für Neurochirurgie (DGNC), Joint Meeting mit der Mexikanischen und Kolumbianischen Gesellschaft für Neurochirurgie; 20180603-20180606; Münster; DOCV245 /20180618/
    Publication Date: 2018-06-19
    Keywords: ddc: 610
    Language: English
    Type: conferenceObject
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  • 2
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    German Medical Science; Düsseldorf, Köln
    In:  57. Jahrestagung der Deutschen Gesellschaft für Neurochirurgie e.V. (DGNC), Joint Meeting mit der Japanischen Gesellschaft für Neurochirurgie; 20060511-20060514; Essen; DOCFR.12.01 /20060508/
    Publication Date: 2006-07-31
    Keywords: ETV ; infant hydrocephalus ; neuroendoscopy ; ETV ; Hydrocephalus ; Neuroendoskopie ; ddc: 610
    Language: English
    Type: conferenceObject
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  • 3
    ISSN: 1432-1106
    Keywords: Bereitschaftsmagnetfeld (BM) ; Readiness potential ; Cerebral motor preparation ; Source detection ; Voluntary foot and toe movements ; Superconducting quantum interference device (SQUID)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Voluntary movements are preceded by a slow electrical potential of the brain (Bereitschaftspotential, BP) or readiness potential. The BP is accompanied by a magnetic field shift of similar time characteristics (Bereitschaftsmagnetfeld, BM). The BM preceding volitional right foot or toe movements was recorded from anterior, posterior, and lateral positions of the scalp using a SQUID (Superconducting Quantum Interference Device) third-order gradiometer. Controls were implemented to reduce head movements, which were simultaneously recorded with a mechanograph. The results showed that movements of the lower extremities are also preceded by a BM. However, contrary to finger movements, BMs with field lines directed into the head were found predominantly for foot movements and exclusively for toe movements. The BM preceding foot movements was maximum over a position 2 cm left of the vertex, i.e., contralateral to the movement. Two centimeters right of the vertex it was smaller, thus exhibiting a normal contralateral preponderance and not sharing the paradoxical side preponderance of the electrical BP preceding foot or toe movements. The BM preceding toe movements was only apparent at the vertex and was smaller than the one preceding foot movement. This may suggest a source that is located still deeper in the brain than with foot movements.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-1106
    Keywords: Bereitschaftspotential ; Finger movements ; Toe movements ; Supplementary motor area ; Movement-related potentials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The cerebral potentials associated with voluntary, self-paced rapid flexions of (1) right fingers, (2) left fingers, (3) right toes, and (4) left toes were compared in the same experiment using 32 right- and left-handed subjects. The Bereitschaftspotential (BP) or readiness potential was, in the first half of the foreperiod, bilaterally symmetrical for both finger and toe movements of either side. In the later foreperiod there were differences: Finger movements showed two maxima, an early one at Cz and a late one, which was lateralized toward the contralateral precentral region. With toe movements, the maximum BP amplitude was always at Cz and not lateralized and was twice as large as with finger movements. The data are compatible with the view that two principal sources of different spatial and temporal characteristics are active in the foreperiod of a voluntary movement. The early generator is probably the supplementary motor area (SMA) on the mesial surface of the hemispheres; the later is the primary motor cortex (MI) which is lateralized for finger but not for toe movements. In lateral leads, rather remote from the mesial source, the BP for toe movements showed a small but significant ipsilateral preponderance, which is obviously due to the fact that dipole sources located on the mesial surface of the hemispheres point to the opposite direction as compared to those on the convexity. Topographic maps of the pre-motion possitivity (PMP) and the motorpotential (MP) reveal the locations of the respective MI generators for toe and finger movements. The MP for toe movements clearly exhibited a similar ipsilateral side preponderance as the BP and hence caused the PMP topography for toe movements to be the reverse of that for finger movements. The potentials after the onset of movement show a longer negativity in Cz and FCz for toe than for finger movements.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0392-6737
    Keywords: Biomagnetism (including magnetocardiography) ; Superconducting devices ; superconducting magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Sono stati registrati i campi magnetici del cervello che precedono i movimenti autonomi delle dita della mano, del piede e della dita del piede stesso, i movimenti delle dita della mano e del piede causati da uno stimolo e la parola. Sono stati trovati lenti spostamenti dei campi magnetici con morfologia simile ai coincidenti potenziali elettrici, ma con distribuzioni molto diverse. Si discutono le deduzioni ottenute dai dati sulla localizzazione dei generatori cerebrali.
    Notes: Summary Magnetic fields of the brain were recorded preceding selfinitiated finger, foot, toe movements, stimulus-triggered finger and toe movements, and speech. Slow magnetic-field shifts were found with morphology similar to coincident electrical potentials, but with very different distributions. Inferences from the data about localization of cerebral generators were discussed.
    Type of Medium: Electronic Resource
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