Gamma- and theta-band synchronization during semantic priming reflect local and long-range lexical-semantic networks.

ABSTRACT: Anterior and posterior brain areas are involved in the storage and retrieval of semantic representations, but it is not known how these areas dynamically interact during semantic processing. We hypothesized that long-range theta-band coherence would reflect coupling of these areas and examined the oscillatory dynamics of lexical-semantic processing using a semantic priming paradigm with a delayed letter-search task while recording subjects' EEG. Time-frequency analysis revealed facilitation of semantic processing for Related compared to Unrelated conditions, which resulted in a reduced N400 and reduced gamma power from 150 to 450ms. Moreover, we observed greater anterior-posterior theta coherence for Unrelated compared to Related conditions over the time windows 150-425ms and 600-900ms. We

SUBMITTER: Mellem MS 

PROVIDER: S-EPMC3864756 | biostudies-literature | 2013 Dec

REPOSITORIES: biostudies-literature