Table 1. Frequency and duration of movement illusions and silent periods.

	Extension		Flexion		No movement
	n	Total duration (sec)	n	Total duration (sec)	n	Total duration (sec)
Onset between 1–30 sec	19	472	2	28	14	84
Onset between 120–150 sec	19	146	6	42	22	175
Onset between 240–270 sec	14	147	4	32	15	223

Frequency and total duration of movement illusions and silent periods in Run 1 is shown as a function of the time of the onset of the event. ‘Onset’ indicates the time of onset of the event relative to the moment when vibration started (the whole duration of the event was measured, regardless of whether it finished within the 30 sec period or not). Note that extension responses initially dominated but were later replaced by the increasingly longer ‘no movement’ periods and, to a lesser extent, flexion responses.