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Figure 8.12. Completion time (average, standard deviation) per task (T1 to T6), on average
(T1-T6), for the conditions C1 (“Earcons”) C2 (“TTS”) and C3 (“No sound”)
However, no significant effect of the hierarchical library (LIB1/LIB2) was
observed on the perception of driving comfort: this was felt to be similar between
hierarchical library versus minimal library [p=0.2], and hierarchical library is
perceived as less comfortable than vocal library [p=0.002] conditions (see
Figure 8.13, for the graphic representation of data).
Figure 8.13. Perceived comfort (average, standard deviation) per task (T1 to T6), on average
(T1-T6), for conditions C1 (“Earcons”), C2 (“TTS”) and C3 (“No sound”)
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