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  • 1
    Electronic Resource
    Electronic Resource
    Effects of voluntary movements on early auditory brain responses (1996)
    Springer
    Experimental brain research 110 (1996), S. 487-492 
    Details
    ISSN: 1432-1106
    Keywords: EEG ; Voluntary movement ; Auditory ; Steady-state response ; Evoked response ; Human
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract It has not been clear whether or not early information processing in the human auditory cortex is altered by voluntary movements. We report a movementrelated, complex event-related potential consisting of relatively long-lasting amplitude and phase perturbations induced in an ongoing auditory steady-state response (SSR) by brief self-paced finger movements. Our results suggest that processing in the auditory cortex during the first 50–100 ms after stimulus delivery is affected before, during, and after voluntary movements, beginning with a 1- to 2-ms delay in the SSR wave form starting 1–2 s before the movement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00229149
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Visually induced gamma-band responses in human electroencephalographic activity — a link to animal studies (1996)
    Springer
    Experimental brain research 112 (1996), S. 96-102 
    Details
    ISSN: 1432-1106
    Keywords: Viually-induced gamma-band responses ; Coherency ; Evolutionary spectra ; Human
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Visual presentation of an object produces firing patterns in cell assemblies representing the features of the object. Based on theoretical considerations and animal experiments, it has been suggested that the binding of neuronal representations of the various features is achieved through synchronization of the oscillatory firing patterns. The present study demonstrates that stimulus-induced gamma-band responses can be recorded non-invasively from human subjects attending to a single moving bar. This finding indicates the synchronization of oscillatory activity in a large group of cortical neurons. Gamma-band responses were not as apparent in the presence of two independently moving stimuli, suggesting that the neuronal activity patterns of different objects are not synchronized. These results open a new paradigm for investigating the mechanisms of feature binding and association building in relation to subjective perception.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00227182
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Changed perceptions in Braille readers (1998)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 391 (1998), S. 134-135 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The mature mammalian nervous system has a striking capacity for plastic remodelling in response to environmental changes, but little is known about the perceptual and behavioural relevance of this phenomenon. Using magnetic source imaging we show that the cortical somatosensory representation ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/34322
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Modulation of oscillatory brain activity and evoked potentials in a repetition priming task in the human EEG (2004)
    Oxford, UK : Blackwell Science Ltd
    European journal of neuroscience 19 (2004), S. 0 
    Details
    ISSN: 1460-9568
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Cortical object representations seem to require the formation of neural cell assemblies. The physiological correlate of cell assembly activity may be seen in synchronized neural activity in the gamma band range. The improvement in perceiving and identifying an object by experience is commonly referred to as repetition priming. One possible neural mechanism for repetition priming is ‘repetition suppression’ within a cell assembly coding the stimulus. The present electroencephalogram study was designed to investigate oscillatory brain activity when line drawings of concrete objects were repeated either immediately after a first presentation or after intervening a number of different stimuli. Results showed a broad posterior distribution of induced gamma band responses (GBRs) after the initial picture presentation. Repeated presentations of the same picture led to a significant decrease of induced gamma power. Furthermore, repeated presentations of the same object resulted in a decrease in phase synchrony between distant electrode sites. No significant repetition effects were found in the alpha or beta frequency range. The event-related potential (ERP), which was also modulated by priming, showed a different scalp distribution compared with induced GBRs. In addition, ERP repetition effects decayed at larger intervals between initial and repeated presentations, whereas induced GBRs were not modulated as a function of stimulus lag. We concluded that the decrease in amplitude of induced GBRs and the reduction of gamma phase synchrony between pairs of electrodes after repeated picture presentations might be linked to a ‘sharpening’ mechanism within a cell assembly representing an object.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.0953-816X.2004.03176.x
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetoencephalographic recording of steadystate visual evoked cortical activity (1997)
    Springer
    Brain topography 9 (1997), S. 163-168 
    Details
    ISSN: 1573-6792
    Keywords: Magnetoencephalography ; Steady-state visual evoked response ; Visual cortex
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Steady-state visual evoked magnetic fields (SSVEFs) were recorded in response to a flickering light source using a 37-channel magnetometer. The SSVEF had a sinusoidal waveform having the same fundamental frequency as the driving stimulus, which was either 6.0 Hz, 11.9 Hz, or 15.2 Hz. SSVEF topographies at each frequency had a dipoloar form over the posterior head that could well-modelled by single equivalent current dipoles. The best-fit dipoles were localized in posterior occipital cortex for the SSVEFs to 6.0 and 11.9 Hz stimuli and in more anterior and ventromedial occipital cortex for the 15.2 Hz SSVEP.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01190385
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    Paper (German National Licenses)
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