## 4 Experimental Results and Discussion
### Methodology  
A subject experiment was conducted with 7 subjects in their twenties to thirties [27] to examine the effectiveness of the proposed method. For consistency of the experiment, all subjects were recruited as right-handed people. The subjects were informed of the experimental location and time before the experiment and were asked to participate in the experiment after sufficient rest. The subjects were also sufficiently informed about the contents of the experiment in advance, and informed consent was obtained from all subjects involved in the study before the start of the experiment. The information measured in the experimental procedure was as follows: demographic questionnaire, subject's body information (arm length), pre-questionnaire, post-questionnaire, and the task information of the subjects. First, before the experiment, a demographic questionnaire consisting of questions regarding the age, gender, and contact information of the subject was completed. Next, a pre-questionnaire consisting of previous MR experiences and the motion sickness condition of the subject was completed. The simulator sickness questionnaire (SSQ), which has been widely used in existing studies, was used to measure motion sickness including the visual fatigue of the test subjects [28]. The SSQ included 16 symptoms that were associated with being indicative of simulator disease. After the demographic questionnaire and pre-questionnaire, the subject's body information was measured. The measured body information was arm length, which was used to set a virtual object generation space suitable for each subjects' body in an application. After body information measurements were completed, the subjects wore a Hololens2 [20] for the experiment. In the experiment, the task to interact with a target virtual object was given to each subject. Grab and pinch gestures were used for interactions with a target virtual object. Figure 8: The experimental environment allows a user to see and interact with virtual objects in the virtual object generation space (the dotted circle). A task made a user interact 27 times with virtual objects in the virtual object generation space. Subjects were instructed to perform the given task four times by gesture so that each subject totally interacted 108 times for gesture interaction. The task information of the subjects was measured during the experiment as follows: interaction starting moment, interaction prediction moment, interaction completion moment, predicted interaction, and prediction result (success or failure). Among the above information, time-related information was measured as shown in Figure 9.  
The small red circles in Figure 9 indicate the interaction starting, interaction prediction, and interaction completion moments, respectively. The interaction starting moment was measured at the moment the target object appeared in the virtual object generation space. The interaction prediction moment was measured at the moment when the gesture of the subject was classified as a specific gesture by consecutive frame input. Finally, the interaction completion moment was measured at the moment when the interaction of the subject with the virtual object was completed. Two interaction latencies were calculated using the interaction starting moment, the interaction prediction moment, and the interaction completion moment for the purpose of comparison: one with the proposed method and the other without the proposed method. While the subject repeated the action shown in Figure 9, the prediction result was also measured, as was the time-related information. If the interaction prediction was correct, the task was recorded as a success and counted. However, if the interaction prediction was incorrect (e.g., a pinch is classified as a grab) or the prediction was not made at all, the prediction was recorded as a failure and not counted. The prediction success rate was calculated from the number of successes counted in this way.