TABLE 1.

Velocity thresholds for yaw rotation, y-translation, and roll tilt (mean ± SD)

	Treatment	Units	Mean velocity	Upper SD	Lower SD
Yaw rotation (1 Hz)	Placebo	°/s	0.87	0.27	0.21
	Promethazine	°/s	0.96	0.26	0.21
Y-translation (1 Hz)	Placebo	cm/s	0.67	0.23	0.17
	Promethazine	cm/s	0.79	0.29	0.21
Roll tilt (0.2 Hz)	Placebo	°/s	0.30	0.15	0.10
	Promethazine	°/s	0.39	0.17	0.12

Statistics computed using results from all ten subjects. Note that standard deviations are not symmetric with respect to the mean when expressed in velocity units. This is because the mean thresholds and standard deviations were calculated in logarithmic units and transformed back to velocities