Prestimulus Network Integration of Auditory Cortex Predisposes Near-Threshold Perception Independently of Local Excitability

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2015
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Ruhnau, Philipp
Frey, Julia
Lithari, Chrysa
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Cerebral Cortex. 2015, 25(12), pp. 4898-4907. ISSN 1047-3211. eISSN 1460-2199. Available under: doi: 10.1093/cercor/bhv212
Zusammenfassung

An ever-increasing number of studies are pointing to the importance of network properties of the brain for understanding behavior such as conscious perception. However, with regards to the influence of prestimulus brain states on perception, this network perspective has rarely been taken. Our recent framework predicts that brain regions crucial for a conscious percept are coupled prior to stimulus arrival, forming pre-established pathways of information flow and influencing perceptual awareness. Using magnetoencephalography (MEG) and graph theoretical measures, we investigated auditory conscious perception in a near-threshold (NT) task and found strong support for this framework. Relevant auditory regions showed an increased prestimulus interhemispheric connectivity. The left auditory cortex was characterized by a hub-like behavior and an enhanced integration into the brain functional network prior to perceptual awareness. Right auditory regions were decoupled from non-auditory regions, presumably forming an integrated information processing unit with the left auditory cortex. In addition, we show for the first time for the auditory modality that local excitability, measured by decreased alpha power in the auditory cortex, increases prior to conscious percepts. Importantly, we were able to show that connectivity states seem to be largely independent from local excitability states in the context of a NT paradigm.

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ISO 690LESKE, Sabine, Philipp RUHNAU, Julia FREY, Chrysa LITHARI, Nadia MÜLLER, Thomas HARTMANN, Nathan WEISZ, 2015. Prestimulus Network Integration of Auditory Cortex Predisposes Near-Threshold Perception Independently of Local Excitability. In: Cerebral Cortex. 2015, 25(12), pp. 4898-4907. ISSN 1047-3211. eISSN 1460-2199. Available under: doi: 10.1093/cercor/bhv212
BibTex
@article{Leske2015Prest-33452,
  year={2015},
  doi={10.1093/cercor/bhv212},
  title={Prestimulus Network Integration of Auditory Cortex Predisposes Near-Threshold Perception Independently of Local Excitability},
  number={12},
  volume={25},
  issn={1047-3211},
  journal={Cerebral Cortex},
  pages={4898--4907},
  author={Leske, Sabine and Ruhnau, Philipp and Frey, Julia and Lithari, Chrysa and Müller, Nadia and Hartmann, Thomas and Weisz, Nathan}
}
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