Grand mean evoked GBA. (a) mean percent change from baseline in eGBA in the range 30 – 60 Hz, separately for each condition; left column shows activity on object trials, right column on non-object trials. (b) Topographical representation of eGBA, averaged from 30–60 Hz and from 50-150 ms. Oval depicts electrode cluster selected for analysis. (c) bar graph depicting mean percent change from baseline of eGBA. Red bars show eGBA on object trials, blue on non-object trials. Error bars depict 95% confidence intervals.