Results

See Table 4.3 for a data summary. The test-retest correlation across all three conditions is .81.

  

Table 4.3: Reported Presence Data for Experiment AIE1

Id	16 (1)	16 (2)	32 (1)	32 (2)	48 (1)	48 (2)
1	3	5	5	5	6	6
2	3	2	3	3	4	4
3	2	2	4	5	6	4
4	1	1	1	1	4	1
5	2	2	3	4	5	5
6	5	6	5	6	3	6
7	4	4	3	5	5	5
8	5	5	3	3	4	4
9	1	1	3	3	7	7
10	5	5	5	5	5	5
11	6	6	3	4	5	5
12	5	5	5	5	3	5
13	3	2	5	5	6	6
14	7	7	4	5	3	4
15	1	2	2	3	6	6
16	3	5	5	5	5	6
17	5	5	4	5	6	6
18	2	4	1	2	3	3
19	2	4	3	3	6	6
20	1.5	1	2	1.5	3.5	1.5
	3.3(1.8)	3.7(1.9)	3.5(1.3)	3.9(1.4)	4.8(1.3)	4.8(1.6)

Id is the participant number. The last 6 columns give the first and second reported presence rating (1--7 scale) for the 16, 32, and 48 FOV conditions, respectively. The final row gives the mean and (in parentheses) standard deviation for each column.

Data from Table 4.3 were analyzed using an ANOVA procedure. The ANOVA Table is given in Table 4.4. A main effect was found for FOV (F(2,38) = 6.2; p < .01). On Tukey's procedure, the difference between the 48 and 16 FOV conditions was significant (p < .01) as was the difference between the 48 and 32 conditions (p < .01). The difference between the 32 and 16 FOV conditions was not significant. There was a trend for increasing reported presence over time (F(1,19) = 3.4; p <.10).

While there is a main effect for highest reported presence in the widest FOV condition, about a third of the participants did not follow this pattern. Five participants (6, 8, 11, 12, 14) reported highest presence not at the widest FOV. An additional two participants (10,18) reported that the widest FOV produced the same presence as at least one of the narrower two FOV's. For all of these seven, the narrowest FOV resulted in the same or greater reported presence as the other two conditions.