Human-Computer Interaction and Presence in Virtual Reality

Chapter 3
3.5.5 Identifying sequence
To reduce the impact of simulator sickness, therapy sessions were divided into two segments
of approximately 20 minutes. The video recordings of an arbitrary number (13) of such
segments, including all five different therapists and seven different patients, were observed
for our TA by the author of this dissertation. In all, 1420 events were classified using the
categories mentioned above.
1.Regulative: Look 242
2.Regulative: Move 50 50
3.Regulative: Posture 35 35
4.Regulative: Report 306
5.Imperative: Control VE 161
6.Constative: Rationale 14 14
7.Constative: VE 18 18
8.Constative: Move
Patient
109
9.Regulative: Question 17 17
11:Expressive: Fear 374
Silence 92
Figure 3.14: Histogram of the speech acts that occurred during therapy.
92
Only a small fraction of the recorded events occurred simultaneously. A small number of
events overlapped, for instance the therapist sometimes asked a patient to look over the
railing while still moving towards that railing. In such cases, the start of the event was used
to determine the sequence.
47
Silence
92
80
57
109
T. regulative:
report fear
P.expressive:
fear
28
300
94
306
161
62
242
T.constative:
movement
374 109
101
T. imperative:
Control VE
83
T. regulative:
look
Figure 3.15: Graph showing the same transitions between events as shown in table 3.4.
However, only the 10 most prevalent transition types are shown to reduce visual complexity.
The numbers near the arrows indicate the absolute number of transitions, the numbers in the
boxes indicate the absolute number of times the event occurred.
38
161
242
306
117
374