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Figure 6. Four prosody categories out of nine are seen in up to 80% of turn-transitions
before the agent takes turn.
6). In the case of interviewee four, the agent needs to learn that Up_At
is a turn giving signal (used in 37.5% of 4's turns), but in the case
of participant eight it is not as obvious. While examining overlaps,
it can be seen that a lot of overlaps occurr in interview eight and at
the beginning of interview nine, indicating that the agent is making
mistakes (see Figure 8).
6.4 Turn overlaps
The final evaluation of success is to view the overlapped turns in each
condition. In the first condition when interviewing self (Artificial),
the overlaps are mostly in the first half of the evaluation. After that,
overlaps drop considerably and stay low throughout the remainder
of the sessions. This is due to the consistency of the interlocutor, the
system learns how to interact with the interlocutor, and makes very few
mistakes towards the end of the evaluation. In the second condition
(Single person) when interviewing a single person for 10 sessions,
overlaps are around 10% or below for all interviews except at the
beginning of third and fifth interviews. In the last scenario where the
system interviews 10 different people, overlaps occur more randomly
due to differences in participants.
It is not surprising that most overlaps are perceived in the last
condition, when the system interviews 10 different people (17%).
It is, however, surprising that fewer overlaps are perceived when
interviewing a single person over an open microphone than when
interviewing an artificial interlocutor in a closed (sound card to sound
card) setting (see Table 7). The artificial interlocutor always selects
one to three sentence fragments and inserts artificial “think pauses”
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