Table 4A.
Orienting angles for optimal alignment of a human subject's head for (A) rotary chair testing about an Earth-vertical axis, (B) caloric stimulation, and (C) head-on-body “head impulses” with the subject seated upright, for each SCC separately and for functional canal pairs
| Rotary chair testing | Explanation of orienting rotations | Semicircular canal to align | First orienting rotation | Second orienting rotation | |||||
|---|---|---|---|---|---|---|---|---|---|
| Angle | Axis | Direction | Angle | Axis | Direction | ||||
| Orient head to align axis of SCC being tested with chair rotation axis parallel to ZEarth axis. | Starting in Reid-Earth Aligned Starting Orientation (REASO, in which +XREID, +YREID, +ZREID axes align with +XEarth, +YEarth, +ZEarth, respectively), first rotation is a nose-up (NU) or nose-down (ND) pitch about YEarth axis. Second rotation is a left-ear-down (LED) or right-ear-down (RED) roll about XEarth | Left | Horizontal | 18.8° | YEarth | ND | 2.2° | XEarth | LED |
| Anterior | 73.3° | YEarth | NU | 52.0° | XEarth | LED | |||
| Posterior | 68.7° | YEarth | NU | 41.8° | XEarth | RED | |||
| Right | Horizontal | 18.8° | YEarth | ND | 2.2° | XEarth | RED | ||
| Anterior | 73.3° | YEarth | NU | 52.0° | XEarth | RED | |||
| Posterior | 68.7° | YEarth | NU | 41.8° | XEarth | LED | |||
| Best Fit Canal Pair | LH RH | 18.8° | YEarth | ND | n/a | n/a | n/a | ||
| LA RP | 70.8° | YEarth | NU | 47.0° | XEarth | LED | |||
| RA LP | 70.8° | YEarth | NU | 47.0° | XEarth | RED | |||