Fig.1B)1B) and dorsal ACC (dACC; Fig. Fig.1C).1C). The graphs in Figure Figure11 depict activation change in these clusters over time for +/− 1 standard deviations and the mean of PSWQ. Partial correlations between habituation of activation and anxious apprehension computed separately for negative and neutral words indicated that effects in Broca’s area and right SFG were driven largely by changes in activation to negative stimuli, whereas the effect in dACC was driven largely by changes in activation to neutral stimuli (Table (Table55). Inhibitors,research,lifescience,medical Table 4 Brain regions in which anxiety types moderated habituation
Table 5 Partial correlations between anxiety and habituation in activation for negative and neutral Figure 1 Moderation of habituation to negative stimuli by anxious apprehension. SFG, superior frontal gyrus; IFG, selleck inferior frontal gyrus; dACC, dorsal anterior cingulate; Blue, high PSWQ associated with habituation; Inhibitors,research,lifescience,medical Red, high PSWQ associated with increased activation … In line with hypotheses, MASQ-AA was associated with habituation in right MTG/ITG, shown in Figure Figure2A.2A. As predicted, MASQ-AA was associated with habituation in three additional areas: right SFG (overlapping Inhibitors,research,lifescience,medical the right SFG area associated with PSWQ, despite analysis of unique variance), paracingulate, and right DLPFC (shown in Fig. Fig.2B-D).2B-D). The graphs in Figure Figure22 depict
activation change in these clusters over time for +/− 1 standard deviations and the mean of MASQ-AA. As shown in Table Table5,5, partial correlations indicated that all observed effects were driven largely by changes in activation to negative Inhibitors,research,lifescience,medical stimuli, except in right DLPFC, which appeared to be driven by changes in activation to both negative and neutral stimuli. Figure 2 Moderation of habituation to negative stimuli by anxious arousal. SFG, superior frontal gyrus; MFG, middle frontal gyrus; DLPFC, dorsolateral Inhibitors,research,lifescience,medical prefrontal cortex; MTG, middle temporal gyrus; ITG, inferior temporal gyrus; Blue, high MASQ-AA associated with … Given that PSWQ and MASQ-AA exhibited effects in opposite directions in right SFG, a direct test of these effects was
computed. Two much clusters were observed: one overlapping the right SFG regions observed for both PSWQ and MASQ-AA (center of mass = [14, 21, 59], cluster size = 1792 mm3, mean z = −2.36), and the second overlapping the right DLPFC cluster associated with MASQ-AA (center of mass = [43, 33, 27], cluster size = 1,448 mm3, mean z = −2.33). These findings indicate that the two anxiety types were associated with different responses to negatively valenced stimuli over time, with anxious arousal showing habituation and anxious apprehension showing either an increase (SFG) or no change (DLPFC) over time. Psychophysiological interaction analyses As predicted, a cluster emerged in right SFG (listed in Table Table66 and visualized in Fig. Fig.