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Neural signatures of perceptual inference

Lookup NU author(s): Dr Will Sedley, Dr Sukhbinder Kumar, Professor Tim Griffiths

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Abstract

© Sedley et al. Generative models, such as predictive coding, posit that perception results from a combination of sensory input and prior prediction, each weighted by its precision (inverse variance), with incongruence between these termed prediction error (deviation from prediction) or surprise (negative log probability of the sensory input). However, direct evidence for such a system, and the physiological basis of its computations, is lacking. Using an auditory stimulus whose pitch value changed according to specific rules, we controlled and separated the three key computational variables underlying perception, and discovered, using direct recordings from human auditory cortex, that surprise due to prediction violations is encoded by local field potential oscillations in the gamma band (>30 Hz), changes to predictions in the beta band (12-30 Hz), and that the precision of predictions appears to quantitatively relate to alpha band oscillations (8-12 Hz). These results confirm oscillatory codes for critical aspects of generative models of perception.


Publication metadata

Author(s): Sedley W, Gander PE, Kumar S, Kovach CK, Oya H, Kawasaki H, Howard MA, Griffiths TD

Publication type: Article

Publication status: Published

Journal: eLife

Year: 2016

Volume: 5

Online publication date: 07/03/2016

Acceptance date: 01/01/1900

ISSN (print): 2050-084X

Publisher: eLife Sciences Publications Ltd

URL: http://doi.org/10.7554/eLife.11476

DOI: 10.7554/eLife.11476


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