Figure 3. Region of interest (ROI) analyses.

(A) Surface renderings and repetition suppression of the signals in the independently defined extrastriate body area (EBA) and caudal middle temporal gyrus(cMTG). The patterns of activity within the confines of these regions was quite different (as shown by the significant ROI by context interaction). Significant repetition suppression exclusive to the same symbolic gestures was found only in EBA. Although there was also substantial decrease of activity associated with the second video showing a different gesture, it was not significant. (B) Detailed analyses of the signal decreases associated with watching intransitive gestures. As shown by a priori t-tests, the signal decrease associated with watching intransitive gestures with the same meaning was significantly greater from the two other conditions (C). Repetition enhancement in the dorso-caudal precuneus (dcPreCun), as defined elsewhere²⁵. Significant increases of activity for any of the second movies showing the two gesture categories (i.e., regardless of whether the same or different) were found. Given that the gesture by context interaction was not significant, the substantial difference between activity associated with watching the same transitive and intransitive gestures was not considered here. Red indicates networks of regions with significant signal increases vs. baseline during gesture watching, regardless of the movie context (1^st, second same, second different). Blue shows areas with stronger adaptation for intransitive gestures outside of these networks. Violet magentas indicate the area where the adaptation for intransitive gestures was found within a network for gesture watching. Except for a priori t-tests, asterisks indicate all the significant differences with the Bonferroni-corrected P values of at least 0.05 (*) or 0.001 (***); ‘NS’ indicates not significant differences.