Document Detail

A precluding but not ensuring role of entrained low-frequency oscillations for auditory perception.
MedLine Citation:
PMID:  22933808     Owner:  NLM     Status:  MEDLINE    
Oscillatory activity in sensory cortices reflects changes in local excitation-inhibition balance, and recent work suggests that phase signatures of ongoing oscillations predict the perceptual detection of subsequent stimuli. Low-frequency oscillations are also entrained by dynamic natural scenes, suggesting that the chance of detecting a brief target depends on the relative timing of this to the entrained rhythm. We tested this hypothesis in humans by implementing a cocktail-party-like scenario requiring subjects to detect a target embedded in a cacophony of background sounds. Using EEG to measure auditory cortical oscillations, we find that the chance of target detection systematically depends on both power and phase of theta-band (2-6 Hz) but not alpha-band (8-12 Hz) oscillations before target. Detection rates were higher and responses faster when oscillatory power was low and both detection rate and response speed were modulated by phase. Intriguingly, the phase dependency was stronger for miss than for hit trials, suggesting that phase has a inhibiting but not ensuring role for detection. Entrainment of theta range oscillations prominently occurs during the processing of attended complex stimuli, such as vocalizations and speech. Our results demonstrate that this entrainment to attended sensory environments may have negative effects on the detection of individual tokens within the environment, and they support the notion that specific phase ranges of cortical oscillations act as gatekeepers for perception.
Benedict Shien Wei Ng; Tim Schroeder; Christoph Kayser
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Publication Detail:
Type:  Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of neuroscience : the official journal of the Society for Neuroscience     Volume:  32     ISSN:  1529-2401     ISO Abbreviation:  J. Neurosci.     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-08-30     Completed Date:  2012-11-05     Revised Date:  2013-01-25    
Medline Journal Info:
Nlm Unique ID:  8102140     Medline TA:  J Neurosci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  12268-76     Citation Subset:  IM    
Max Planck Institute for Biological Cybernetics, D-72076 Tübingen, Germany.
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MeSH Terms
Acoustic Stimulation / methods*
Auditory Cortex / physiology*
Auditory Perception / physiology*
Brain Waves / physiology
Electroencephalography / methods
Reaction Time / physiology*
Comment In:
J Neurosci. 2012 Dec 5;32(49):17525-7   [PMID:  23223276 ]

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