This thesis explores alpha- and beta-band oscillations in the language production network, focusing on their spatial distribution, their link to lexical-semantic processing, and frequency dynamics within oscillatory bands beyond traditional power modulation.
The first study demonstrates that alpha- and beta-power decreases overlap in left posterior temporal and inferior parietal regions, key areas associated with conceptual-lexical processing. The second study shows that beta power in these regions is modulated by semantic context, with greater power decreases observed when naming pictures from mixed semantic categories compared to same semantic categories, reflecting their sensitivity to lexical-semantic demands. The third study indicates region-specific frequency dynamics, revealing a shift toward slower alpha frequencies in the posterior superior temporal gyrus, a "hub" region that supports flexible cognitive integration, and faster beta frequencies in the left ventral precentral gyrus, a "modular" region specialized for speech motor execution during articulation.