Table 1.

Cost of obstacle detection on accuracy of phone message (text and audio) report
DTC to ARM
Phone message modality	Obstacle	DTC in %	DTC in %
	approach	Young adults	Older adults
	Left	0.0	8.7 ± 16*
Text messages	Center	0.0	3.0 ± 8.0*
	Right	0.0	8.9 ± 14*
	Left	0.0	0.0
Audio messages	Center	0.0	0.0
	Right	0.0	0.0
Cost of deciphering phone messages (text and audio) on obstacle detection time
DTC to ODT
Phone message modality	Obstacle	DTC in %	DTC in %
	approach	Young adults	Older adults
	Left	1.2 ± 5.6	2.2 ± 10
Text messages	Center	1.9 ± 8.0*	4.1 ± 8.9*
	Right	4.8 ± 8.5*	9.7 ± 16.2*
	Left	-1.3 ± 7.2	1.0 ± 7.5
Audio messages	Center	-3.9 ± 8.2	-2.1 ± 8.7
	Right	-0.6 ± 6.4	0.1 ± 8.8

Dual task costs (DTC) for accuracy of message response (AMR) and obstacle detection time (ODT) in the young and older adults. Dual-task cost (DTC) incurred by the detection of obstacles on the accuracy of message reports (AMR) and phone messages deciphering on the obstacle detection time (ODT). DTC represented as positive and negative values indicate, respectively, an increased and a reduced cost compared to the single task conditions. Symbols indicate *p < 0.01, **p < 0.01 compared to left approach.