Table 2.

Definitions of the types of response on the bar trajectory curve and variables used in the analysis.

Response type name	Response type definition
Not tagged movement	Movements that are not labeled, in the following cases:  • One of the parts of the movement (start, peak, or end) could not be identified  • No reaction was produced by the participant in response to tightrope walker's movement
Ego-centered response	The participant reacted to the TW's tilts by leaning to his own left when the TW leans to his right (or to his right when the TW leans to his left), indicating that he kept an ego-centered perspective and an embodied self-location
Hetero-centered response	The participant reacted to the TW's tilts by leaning to his own right when the TW leans to his right (or to his left when the TW leans to his left), indicating that he adopted an hetero-centered perspective and a disembodied self-location
Ambiguous movement	The participant reacted to the TW's tilts with an ego-centered or hetero-centered response before changing his response by leaning to the other side
Movement's characteristics	Definition
Amplitude of the participant's movement	The amplitude of the movement is the difference between the peek and the beginning of the movement
Length of the participant's movement	The length of the movement is the difference between the end and the beginning of movement
Latency of the annotated participant's movement	The latency of the movement is calculated on the difference between the TW movement start and the participant movement start
Overshoot	The overshoot corresponds to the delta between the amplitude of the movement and the amplitude of the TW's movement
Overlength	The overlength corresponds to the delta between the length of the movement, and the length of the TW's tilt or movement