The current research is an attempt to construe reflexive constructions in Slavic in terms of cognitive prototypicality. This includes comparison of SE reflexes in modern Slavic languages. This allows us to understand the semantic relationship and the system of the modern reflexes of Late Common Slavic SE. A number of renowned researchers have already commented about the SJA and reflexive constructions, but only in terms of change in participant structure(Švedova et al. 1982, Vinogradov 1947, Isačenko 1960, Janko-Trinickaja 1962, Gerritsen 1990, Janda 1993, Kemmer 1993, Israeli 1997). However, the real language data from Russian National Corpus show that there are examples which do not fit in the classifications by scholars above. There is one of the approaches of Cognitive linguistics, called Construction Grammar, which can explain these kinds of constructional polysemy or multifinctionality. In the first part of the research is shown a set of examples, which has relationship among themselves and the relationship can be explained via cognitive prototypicality. Although the examples do not share any common semantic feature, they are considered as semantically related. The second part of the research includes the modern reflexes from Slavic languages. These reflexes share their etymological origin, but they serve various semantic functions in their languages. The comparison gives an insight to understand the current linguistic situation regarding SE reflexes.