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. 2013 Aug 30;8(8):e72693. doi: 10.1371/journal.pone.0072693

Figure 4. Bilateral CBFV changes during cued word generation and Acheulean tool-making.

Figure 4

Bilateral CBFV changes were recorded simultaneously in the left (black trace) and right (red) MCAs for the language (A) and knapping (B) tasks. During the language task, blood flow in the left hemisphere increases more strongly than on the right, while the flint knapping task causes blood flow in the right artery to increase more than on the left. Blood flow changes are measured relative to a baseline, marked by a black bar (B-line), covering the mean CBFV over the final 5 seconds before task onset.