Figure 5.

Association between high-gamma activities during naming and working memory tasks. (A) Variables correlated to high-gamma activity during naming task sentence listening are presented. Bar graphs at each region of interest show the degree of high-gamma modulation during naming task sentence listening period (left), working memory task maintenance period (center), and working memory task scanning period (right). +0.10 indicates 10% increase compared to the baseline value. Red and blue bars respectively indicate positive and negative correlation between high-gamma activity during sentence listening period and that during working memory task maintenance or scanning period, based on the results of mixed model analysis. We found that iPreCG high-gamma activity during sentence listening was positively correlated to that during working memory task maintenance period as well as patient age. (B) Variables correlated to high-gamma activity during naming task judgement period are presented. We found that high-gamma activity during naming task judgment period was positively correlated to that during working memory task scanning period at multiple regions of interest but not at IFG or ORB. IFG high-gamma activity during naming task judgement period was significantly larger in the left compared to the right. Left middle-temporal high-gamma activity during working memory task scanning period was rather attenuated compared to that during the baseline period; thereby, electrode sites showing larger high-gamma attenuation were associated with smaller high-gamma augmentation during naming task judgement.