TABLE 2.
Parabolic variable- and fixed-radius centrifugation
| Time to 0.63 × peak, s | Gain | PT Decay, % | Aftereffect, % | n | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| A. Variable-radius | ||||||||||
| Monkey H | ||||||||||
| CW, back (+) | 12.9 ± 0.9 | 0.94 ± 0.02 | 41.5 ± 4.1 | 27.7 ± 1.5 | 8 | |||||
| CCW, face (+) | 11.3 ± 1.1 | 0.90 ± 0.02 | 52.2 ± 4.5 | 23.3 ± 3.6 | 6 | |||||
| CW, face (−) | 12.0 ± 1.5 | 0.68 ± 0.03 | 35.3 ± 6.03 | 42.6 ± 6.6 | 6 | |||||
| CCW, back (−) | 14.4 ± 2.1 | 0.74 ± 0.03 | 41.9 ± 8.1 | 36.5 ± 4.3 | 5 | |||||
| Monkey A | ||||||||||
| CW, back (+) | 14.4 ± 2.5 | 0.93 ± 0.03 | 51.6 ± 5.3 | 34.4 ± 4.8 | 5 | |||||
| CCW, face (+) | 9.2 ± 0.6 | 0.90 ± 0.07 | 67.8 ± 4.4 | 37.8 ± 1.6 | 4 | |||||
| CW, face (−) | 11.7 ± 1.1 | 0.65 ± 0.01 | 32.3 ± 2.3 | 55.4 ± 3.1 | 4 | |||||
| CCW, back (−) | 12.1 ± 1.1 | 0.69 ± 0.05 | 60.0 ± 2.9 | 52.2 ± 10.8 | 4 | |||||
| B. Fixed-radius | ||||||||||
| Monkey H | ||||||||||
| CW, back (+) | 46 ± 2.3 | 0.87 ± 0.03 | 0 | 1.1 ± 3.4 | 6 | |||||
| CCW, face (+) | 33 ± 2.9 | 0.73 ± 0.03 | 0 | 0 | 10 | |||||
| CW, face (−) | 36 ± 4.3 | 0.71 ± 0.05 | 0 | 7.0 ± 5.1 | 5 | |||||
| CCW, back (−) | 34 ± 3.9 | 0.76 ± 0.04 | 9.2 ± 6.5 | 3.9 ± 2.4 | 5 | |||||
| Monkey A | ||||||||||
| CW, back (+) | 37.4 ± 2.5 | 0.79 ± 0.04 | 7.6 ± 2.8 | 2.5 ± 1.7 | 5 | |||||
| CCW, face (+) | 42.7 ± 2.1 | 0.81 ± 0.04 | 11.1 ± 1.2 | 7.4 ± 2.4 | 4 | |||||
| CW, face (−) | 38.8 ± 2.7 | 0.77 ± 0.15 | 0 | 0 | 4 | |||||
| CCW, back (−) | 34.5 ± 3.0 | 0.76 ± 0.04 | 6.6 ± 5.9 | 5.3 ± 3.0 | 5 | |||||
Values are means ± SE. Time to 0.63 × peak is the time in seconds required for the SVV response to reach 0.63 of its maximum value, measured from the onset of the centrifugal force application (t = 15 s). Gain is the peak SVV deviation divided by the peak tilt of the GIF (30°). Perceived head tilt (PT) decay is defined as the magnitude of the decline in perceived tilt (maximum PT − minimum PT) during sustained centrifugal force expressed as a percentage of the maximum PT. Aftereffect is the magnitude of the reversal in PT that occurred after the centrifugal force was removed expressed as a percentage of the maximum PT. Centrifugation trials that rotate the GIF toward the right ear are indicated by plus (+) signs and trials that rotate it toward the left ear by minus (−) signs (see Fig. 1, inset).