Summary

**Table 4.5:** Experiment AIE2: Meaningful/Random (Nulling Measure)
Background	Investigated the effect of a meaningful/random manipulation on the reported presence and nulling measures.
Hypothesis	Both measures will record higher values for the meaningful condition.
Methods	A meaningful and random scene were compared, both at 48 $^{\circ}$ FOV. There were two exposures to each condition for each measure. A +90 $^{\circ}$ vection-inertial phase angle was used on all nulling measure trials.
Results	The test-retest correlation for both measures was about .80. The nulling measure found the predicted effect (p < .05). There was a trend for reported presence in the predicted direction (p < .10).
Conclusions	For the meaningful/random conditions, the nulling measure is self-consistent and agrees with prediction and a trend in the reported presence data.