Sensory data such as visual and sound images are now being processed as integral digital signals.Brain wave (EEG) behavior analysis was conducted to evaluate the synergistic effect of visual image accompanied with sound by comparing with the unaccompanied case, to obtain the following result. 1. Visual images used in simulations and those used for amusement purposes were tested. Result of EEG behabior analysis of the viewers suggested that BGM helped to prevent the viewers from declining the mental activities to the simulation images, and that the sound effect synchronized with the amusement images could radically stimulate the mental activities of the viewer. 2. It was suggested that EEG behavior analysis enables objective evaluation of the effect as well as adequacy of combining visual and sound images in space presentations.

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The landscape simulation system applied virtual reality technology is extremely effective compared to a former system. The theoretical analysis concerned to a presentation method and its computer simulation have been executed. And, the visibility and recognized distance error are examined by human experiment. Finally, results of both computer simulation and experiment are considered, and those are fairly coincident in an inclination.

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