Subjective methods and qualitative investigation are frequently used, and quantitative analysis is limited since objective stimuli that can be used in specific space environment are few...

• 采用主观观察及定性实验方法和手段更多一些,定量的观察方法由于刺激手段受到空间特殊环境的限制,样本量较少,很难将问题精确定位。