Mean cerebral and cerebellar perfusion (in millilitres per 100 grams of tissue per minute) for each condition as determined by arterial spin labelling technique
| Cerebrum and cerebellum regions of interest (mL/100 g/min), mean (95% CI) | Neutral | Manipulation | Maximum rotation | F | P value |
| Uvula | 79.2 (68.2 to 90.2) | 80.1 (68.4 to 91.8) | 79.1 (67.8 to 90.3) | 0.0064 | 0.9364 |
| Cerebellar tonsils | 69.2 (60.6 to 77.8) | 66.8 (59.6 to 74.1) | 68.2 (60.6 to 75.8) | 0.0632 | 0.8035 |
| L fusiform gyrus/L middle temporal gyrus | 80.7 (68.6 to 92.8) | 78.0 (66.7 to 89.3) | 79.0 (68.8 to 89.3) | 0.0395 | 0.8440 |
| R middle temporal gyrus | 37.4 (31.8 to 43.0) | 35.7 (30.5 to 40.9) | 36.1 (30.1 to 42.1) | 0.0673 | 0.7974 |
| R middle occipital gyrus | 58.2 (53.1 to 79.9) | 52.8 (44.8 to 60.9) | 53.2 (44.7 to 61.7) | 0.323 | 0.5747 |
| Right and left cuneus | 66.5 (53.1 to 79.9) | 62.3 (60.0 to 73.6) | 61.0 (48.4 to 73.3) | 0.1455 | 0.7060 |
| Left precuneus | 75.7 (61.9 to 89.4) | 74.9 (62.9 to 86.8) | 64.1 (53.9 to 74.3) | 0.7736 | 0.3872 |
| Left cuneus, left middle occipital gyrus | 49.4 (41.6 to 57. 1) | 47.6 (40.2 to 55.1) | 46.9 (38.8 to 55.0) | 0.0742 | 0.7875 |