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  The modulation of alpha-wave amplitude in human EEG by the intention to act with a motor response

Kirschfeld, K. (2009). The modulation of alpha-wave amplitude in human EEG by the intention to act with a motor response. Nature Precedings, 2009, 1-23. doi:10.1038/npre.2009.3720.1.

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Kirschfeld, K1, 2, Author              
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1Former Department Comparative Neurobiology, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497800              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              

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 Abstract: The most conspicuous signal in the human EEG is the so-called alpha wave, oscillations in the frequency range of 8 to 12 Hz. Visual stimulation of the retina suppresses the amplitude of alpha waves (Berger effect), and increased attention can reduce them. Here I show that one more parameter significantly affects the amplitudes of alpha waves: the intention to act by a motor response. Together with data from the literature, these results show that alpha waves are not part of the visual processing network but rather part of a long-range neuromodulatory network. The modulation modifies latencies in perception or motor response. The relevant mechanisms are located in early cortical visual areas; their activity may contribute to hemodynamic changes in these areas and thus explain dissociations between Bold signals and spike activities mentioned in the literature.

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 Dates: 2009-09
 Publication Status: Published online
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 Identifiers: DOI: 10.1038/npre.2009.3720.1
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Title: Nature Precedings
Source Genre: Journal
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Pages: - Volume / Issue: 2009 Sequence Number: - Start / End Page: 1 - 23 Identifier: -