I see what you mean: theta power increases are involved in the retrieval of lexical semantic information.

摘要: An influential hypothesis regarding the neural basis of mental lexicon is that semantic representations are neurally implemented as distributed networks carrying sensory, motor and/or more abstract functional information. This work investigates whether properties words partly determine topography such networks. Subjects performed a visual lexical decision task while their EEG was recorded. We compared responses to nouns with either (VIS, referring colors and shapes) or auditory (AUD, sounds). A time-frequency analysis revealed power increases in theta (4-7Hz) lower-beta (13-18Hz) frequency bands, an early increase subsequent decrease for alpha (8-12Hz) band. In band we observed double dissociation: temporal electrodes showed larger AUD condition, occipital leads VIS condition. The results support notion stored reflects items, provide further evidence oscillatory brain dynamics range functionally related retrieval