The article aims to draw attention to bistable perception which turns out to be a very interesting subject of experimental and theoretical discussion. This term is understood as visual perception which involves at least two interpretations of what is perceived. Research into this phenomenon provides new facts and knowledge in the field of visual perception. It Indicates that volitional influence on the perception of ambiguous figures is possible, through the influence of top-down cognitive modulation in which mainly parietal and frontal areas of the brain are involved. The results of the study constitute an important argument in the ongoing discussion on the role of sensory data and knowledge in the process of visual perception.