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  The faces of predictive coding

Brodski, A., Paasch, G.-F., Helbling, S., & Wibral, M. (2015). The faces of predictive coding. The Journal of Neuroscience, 35(24), 8997-9006. doi:10.1523/JNEUROSCI.1529-14.2015.

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 Creators:
Brodski, Alla1, Author
Paasch, Georg-Friedrich1, Author
Helbling, Saskia2, Author              
Wibral, Michael1, Author
Affiliations:
1MEG Unit, Brain Imaging Centre, Goethe University, Frankfurt, Germany, ou_persistent22              
2Institute of Medical Psychology, Goethe University, Frankfurt, Germany, ou_persistent22              

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Free keywords: Gamma-band activity; Mooney faces; Perceptual closure; Prediction error; Predictive coding
 Abstract: Recent neurophysiological accounts of predictive coding hypothesized that a mismatch of prediction and sensory evidence-a prediction error (PE)-should be signaled by increased gamma-band activity (GBA) in the cortical area where prediction and evidence are compared. This hypothesis contrasts with alternative accounts where violated predictions should lead to reduced neural responses. We tested these hypotheses by violating predictions about face orientation and illumination direction in a Mooney face-detection task, while recording magnetoencephalographic responses in a large sample of 48 human subjects. The investigated predictions, acquired via lifelong experience, are known to be processed at different time points and brain regions during face recognition.Behavioral responses confirmed the induction of PEs by our task. Beamformer source analysis revealed an early PE signal for unexpected orientation in visual brain areas followed by a PE signal for unexpected illumination in areas involved in 3D shape from shading and spatial working memory. Both PE signals were reflected by increases in high-frequency (68-140 Hz) GBA. In high-frequency GBA we also observed a late interaction effect in visual brain areas, probably corresponding to a high-level PE signal. In addition, increased high-frequency GBA for expected illumination was observed in brain areas involved in attention to internal representations. Our results strongly support the hypothesis that increased GBA signals PEs. Additionally, GBA may represent attentional effects.

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Language(s): eng - English
 Dates: 2015-03-162014-04-142015-04-152015-06-17
 Publication Status: Published in print
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1523/JNEUROSCI.1529-14.2015
PMID: 26085625
 Degree: -

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Title: The Journal of Neuroscience
  Abbreviation : J. Neurosci.
Source Genre: Journal
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Publ. Info: Washington, DC : Society of Neuroscience
Pages: - Volume / Issue: 35 (24) Sequence Number: - Start / End Page: 8997 - 9006 Identifier: ISSN: 0270-6474
CoNE: https://pure.mpg.de/cone/journals/resource/954925502187_1