Interactions among three axes of head rotation
| Variable head axis plotted against PN activity . | Range of constant increments for variable head angles (deg.) . | N . | Mean constant head angle (deg.) . | Slope (act/°/°) . | P value . | r2 value . |
|---|---|---|---|---|---|---|
| Roll | Pitch: 1.0 to 28.2 | 31 | Yaw: 0.7 | 0.0002 | 0.0001 | 0.42 |
| Yaw: −9.2 to 3.0 | 6 | Pitch: −3.0 | −0.0001 | 0.0212 | 0.77 | |
| Pitch | Roll: −10.5 to 14.3 | 45 | Yaw: 1.5 | −0.0002 | 0.0022 | 0.20 |
| Yaw: −4.0 to 3.1 | 14 | Roll: 3.0 | 0.0008 | 0.0012 | 0.80 |
| Variable head axis plotted against PN activity . | Range of constant increments for variable head angles (deg.) . | N . | Mean constant head angle (deg.) . | Slope (act/°/°) . | P value . | r2 value . |
|---|---|---|---|---|---|---|
| Roll | Pitch: 1.0 to 28.2 | 31 | Yaw: 0.7 | 0.0002 | 0.0001 | 0.42 |
| Yaw: −9.2 to 3.0 | 6 | Pitch: −3.0 | −0.0001 | 0.0212 | 0.77 | |
| Pitch | Roll: −10.5 to 14.3 | 45 | Yaw: 1.5 | −0.0002 | 0.0022 | 0.20 |
| Yaw: −4.0 to 3.1 | 14 | Roll: 3.0 | 0.0008 | 0.0012 | 0.80 |
Rows indicate that the relationship of roll or pitch versusprosternal nerve (PN) activity is affected by the head position around a second axis while the head is held constant around the third axis. The relationship of the first row is partially illustrated in Fig. 6 to make the method of analysis clear, but see the text for further details.