Table 2.

Perturbation conditions

Perturbation	No. of Experiments	θ, °	α	No. of Cells	Subject
(100%, 30°, V)	11	30	1	278	A
(50%, 30°, I)	5	15	0.97	279	A
(50%, 45°, I)	5	22.5	0.92	107	W
(50%, 60°, I)	13	30	0.87	363	W (2), A (11)
(50%, 60°, V)	20	30	0.87	544	A
(50%, 75°, I)	12	37.5	0.79	313	A
(50%, 90°, I)	10	45	0.71	460	W
(25%, 90°, I)	43	18.4	0.79	1109	A
(25%, 90°, V)	5	18.4	0.79	115	A

Values for each of the different perturbation conditions tested include the number of experiments run in each perturbation condition, the expected rotational error (θ) and speed gain (α) in each experimental condition, the total number of units (cells) studied under each perturbation condition, and the subject that performed the experiments. Notation for perturbation conditions is in the form (%, °, V/I), giving the percentage of cells rotated, the extent of the perturbation in degrees, and whether there was an invisible zone (I) or no invisible zone (V) used in the experiment.