Figure 2. Head extension in relation to start position (baseline) and in relation to mandibular movement cycles (A). Mean head extension for the group (n = 12), at the start of chewing cycles nos. 1, 2, 5, 10, 15, and 20 for the different boluses (B). Wilcoxon matched-pairs test for differences in head extension between these time points: * p < 0.05; ** p < 0.01. Note differences in head extension between start of cycle 1 and start of cycle 2 for all boluses. Definitions of preparatory head extension and head movements (C).