The purpose of this article is to describe a semantic category of perceptiveness and its indicators. The author analyses the relationship between perception processes with such fundamental notions as: time, space and existence. Also, the notion of the perceiving experiencer has been discussed. This category can be shown in the text by means of various terminology so it can be the picture of the author, the speaker’s point of view, the observer, private sphere or subject’s sphere. The notion of the perceiving experiencer is very widely understood. This term also comprises the notion of the speaker and the observer. In some cases (e.g. in nominative sentences) these figures can overlap. The notion of observer is also analysed in terms of its relationships with categories of aspect, time and spatial deixis. Using specific lexis characteristic of particular perception modalities is typical of a perceptual situation. Structural and semantic types of sentences are one of the differentiation means of text types. The examined type of sentences is found in texts which are referred to as perceptive.