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thought they would continue to use auditory guidance in the vehicle for the long-
term. In addition, an identical proportion (71%) prefered to continue to use the same
auditory library rather than changing it in order to conserve the benefit of learning
(“to benefit from the automatic mechanism”, or “to change would be a handicap”).
In terms of use strategy, a few participants would use the vocal library (LIB3)
during the discovery phase of the system - a more explicit library, requiring no
learning - and would then use one of the hierarchical libraries for the long term
(LIB1/LIB2) that are less tedious, shorter, more pleasant and personalized. After
appropriation of the system, hierarchical libraries would thus be used by 35% of
participants, the vocal library by 30% of participants and another 30% would opt for
a mixed library (hierarchical plus vocal), vocal being used to replace the non-explicit
sounds of the last menu level. Only one person (5%) preferred the non-sonified
condition.
8.6.6.
Conclusions
In summary, with regards to the starting hypotheses (H1 to H4) and in the
current state of the evaluation process of the approach, the partial conclusions that
can be drawn are as follows:
- the idea that sonification enables us to carry out navigation tasks more rapidly
is not yet validated; indeed, the duration of tasks is identical with or without one of
the hierarchical libraries (LIB1/LIB2) and longer with the vocal library (LIB3);
- the idea that sonification enables better attention to driving is partially
validated but could be consolidated with more objective measures (like eye tracking,
for example);
- the idea that hierarchical libraries support long-term use better than vocal
libraries is
in theory
validated only for the first levels of the hierarchical structure;
the idea the museme library (LIB2) supports long-term use better than the hybrid
library (LIB1) is
in
theory
not validated, even if the museme library globally has a
better continuity for the auditory theme; the evocative aspect of sonification used in
the hybrid library seems to be preferred by users.
8.7. Discussion and perspectives
8.7.1.
Discussion
The domain of auditory HMIs is meeting increasingly common auditory
contexts: we have gone from a visual “civilization” to an audio-visual one. This
transition can be explained by an accumulation of visual information in HMIs, thus
