Table 3.

Preferences matrix for user interface schemes by participant group (G1–G4)

			User characteristics	Preference for one or two vibration actuator(s)
G	Blind/VIP		Regular cane user	Age < 24	First preference		Second preference
1	Blind		Yes	Yes	Two		One
1	Blind		Yes	No	Two		One
1	Blind		No	Yes	Two		One
2	Blind		No	No	One		Two
3	VIP		Yes	Yes	One		Two
3	VIP		Yes	No	One		Two
3	VIP		No	No	One		Two
4	VIP		No	Yes	Two		One