What is Situation Model: Propositional Symbol or Perceptual Symbol?
情境模型的实质：命题符号与知觉符号之争

How to construct situation model is the hotspot in comprehension study. The prevailing propositional symbol theory proposes situation models are amodal system composed of a bunch of relative propositions. With the development of knowledge representing theory, perceptual symbol theory conceptualizes situation models as modal system containing perceptual symbol. This paper compared the different explanations of situation model based on different theories, introduced the experiments to verify their reasonableness and prospected the way to validate two theories.