Fig. 3
Gamma frequency analysis. A1–D1, A2–D2 Power map in response to faces and mosaics in Group O and Group M. Mean gamma power was measured during 0–750 ms in AM, FU and PH and 250–1000 ms in HI after stimulus onset and applied to the linear mixed-effects model. Gamma power was higher for faces than mosaics in AM (A1) and FU (C1) of Group O. A3–D3, A4–D4 Power map showing the response to faces minus mosaics in Group O and Group M. A5–D5 Unthresholded t-statistics comparing the power map for faces minus mosaics in Group O and Group M. Positive t-statistics indicate higher power in Group O and negative t-statistics indicate higher power in Group M. A6–D6 Remaining clusters of t-statistics after voxel-based and cluster-based thresholding at p ≤ 0.05. Large clusters in the gamma frequency range remained in AM and FU, indicating higher gamma power in Group O