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Phase-locked gamma band responses to semantic violation stimuli

Braeutigam, Sven; Bailey, Anthony J. and Swithenby, Stephen J. (2001). Phase-locked gamma band responses to semantic violation stimuli. Cognitive Brain Research, 10(3) pp. 365–377.

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This paper addresses the role of γ-band activity in semantic networks associated with the processing of words and sentences in humans. Magnetoencephalography (MEG) was used to compare the responses of eleven normal volunteers to semantically congruous and incongruous words at the end of syntactically correct sentences. The averaged low frequency responses evoked by the two word classes were clearly different within the latency range associated with N400 components. The oscillatory characteristics of the evoked responses were analysed using Gabor transform techniques in conjunction with statistical re-sampling. This revealed transient γ-oscillations (35 Hz) that were significantly phase-locked to both types of stimuli but preferentially present at intermediate (300 ms) and long (>500 ms) latencies for incongruous words. This stimulus dependent phase locked γ-activity occurred at latencies that were distinct from the short latency and evoked N400 components. The findings suggest that synchronised oscillations provide independent information about brain dynamics and that some semantic processes may dissociate into distinct functional stages.

Item Type: Journal Item
ISSN: 0926-6410
Keywords: gamma; phase-locking; language; semantic; N400m; magnetoencephalography
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Life, Health and Chemical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 4359
Depositing User: Users 6827 not found.
Date Deposited: 05 Jul 2006
Last Modified: 07 Dec 2018 08:56
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