Movement of objects that would normally be expected to be visual triggers of building vibrations perception, are not necessarily seen in actual building environments. It is therefore necessary to examine the influence of visual cues on vibration perception, taking into account the length of the times to see visual cues. For this purpose, those data necessary to estimate the probability of vibration perception from seeing of visual cues (for instance, length of time to see visual cues and distance between people and the seen visual cues) have been measured in actual buildings. In addition, statistical analysis of the data has been carried out. It has been found that the time to see visual cues is about 7.0 seconds on average, regardless of a person's age and sex, and the type of building. The distance between people and seen visual cues is about 2.4 meters on average.
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