Figure 3.

Comparison of lexical affiliates in sentences when preceded by iconic co-speech gestures that visually described those words (blue) and when not preceded by those gestures (red). (a) Example frames from ‘I type the poem’ for the no-gesture (top/red) and gesture video clips (bottom/blue). The latter was constructed to show hand and arm motion from the start of the sentence to the end of the lexical affiliate visually described by the gesture (‘type’). (b) Beginning 148 ms after the onset of the lexical affiliate and progressing in 4 ms steps to 184 ms, brain images show significant no-gesture > iconic gesture activity. The inset at 164 ms magnifies the primary AC and PST regions (figure 1a). Brain images at 180 ms are not shown because there were no significant differences. All p's ≤ 0.05 FDR corrected for multiple comparisons with a cluster size of 20 voxels. (c) Brain images show the mean of activity from the onset of the lexical affiliates to 184 ms illustrating more overall activity for the no-gesture condition. Time series below those images are the averaged bilateral primary AC (TTG) response for that time period and the horizontal lines are the means of those time series.