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  Endogenously generated gamma-band oscillations in early visual cortex: A neurofeedback study

Merkel, N., Wibral, M., Bland, G., & Singer, W. (2018). Endogenously generated gamma-band oscillations in early visual cortex: A neurofeedback study. Human Brain Mapping, 39(9), 3487-3502. doi:10.1002/hbm.24189.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0002-C715-6 Version Permalink: https://hdl.handle.net/21.11116/0000-000C-74DB-B
Genre: Journal Article

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Merkel_2018_EndogenouslyGenerated.pdf (Publisher version), 2MB
 
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2018
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https://onlinelibrary.wiley.com/doi/10.1002/hbm.24189 (Publisher version)
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 Creators:
Merkel, Nina1, 2, Author
Wibral, Michael, Author
Bland, Gareth1, 2, Author
Singer, Wolf1, 2, Author                 
Affiliations:
1Ernst Strüngmann Institute (ESI) for Neuroscience in Cooperation with Max Planck Society, Max Planck Society, Deutschordenstr. 46, 60528 Frankfurt, DE, ou_2074314              
2Singer Lab, Ernst Strüngmann Institute (ESI) for Neuroscience in Cooperation with Max Planck Society, Max Planck Society, Deutschordenstraße 46, 60528 Frankfurt, DE, ou_3381220              

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Free keywords: human imagery neurofeedback visual cortex visual gamma oscillation
 Abstract: Human subjects were trained with neurofeedback (NFB) to enhance the power of narrow-band gamma oscillations in circumscribed regions of early visual cortex. To select the region and the oscillation frequency for NFB training, gamma oscillations were induced with locally presented drifting gratings. The source and frequency of these induced oscillations were determined using beamforming methods. During NFB training the power of narrow band gamma oscillations was continuously extracted from this source with online beamforming and converted into the pitch of a tone signal. We found that seven out of ten subjects were able to selectively increase the amplitude of gamma oscillations in the absence of visual stimulation. One subject however failed completely and two subjects succeeded to manipulate the feedback signal by contraction of muscles. In all subjects the attempts to enhance visual gamma oscillations were associated with an increase of beta oscillations over precentral/frontal regions. Only successful subjects exhibited an additional marked increase of theta oscillations over precentral/prefrontal and temporal regions whereas unsuccessful subjects showed an increase of alpha band oscillations over occipital regions. We argue that spatially confined networks in early visual cortex can be entrained to engage in narrow band gamma oscillations not only by visual stimuli but also by top down signals. We interpret the concomitant increase in beta oscillations as indication for an engagement of the fronto-parietal attention network and the increase of theta oscillations as a correlate of imagery. Our finding support the application of NFB in disease conditions associated with impaired gamma synchronization.

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 Dates: 2018-04-262018-08-11
 Publication Status: Issued
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 Rev. Type: Peer
 Identifiers: DOI: 10.1002/hbm.24189
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Title: Human Brain Mapping
Source Genre: Journal
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Publ. Info: New York : Wiley-Liss
Pages: - Volume / Issue: 39 (9) Sequence Number: - Start / End Page: 3487 - 3502 Identifier: ISSN: 1065-9471
CoNE: https://pure.mpg.de/cone/journals/resource/954925601686