ИСТИНА

We investigated the strength of visual illusions in 2D–3D configurations. The Müller-Lyer illusion (MLI), simultaneous lightness contrast (SLC), and the Vasarely illusion (VI) were used. Stereo pairs of original illusions were presented in 2D (disparity=0) and 3D (4 values of disparity) configurations using HMD technique. In MLI the positions of wings were changed: their ends were moved in/out of the background forming convex/concave corners in 3D images. In SLC three configurations were formed: test patches were (A) moved out of the background being coplanar with it; (B) located at the same vertical angle to the background; (C) located at different angles to it. In VI nested squares were moved in/out forming tunnel/pyramid configurations. 25 naive subjects were tested. For the estimation of the illusory effect the method of constant stimuli was used. Our results showed that the strength of MLI decreased for 3D configurations asymmetrically (stronger for concave corners). SLC weakly depended on A, B variants of 3D configuration and changed for C variant. The strength of VI increased for the pyramid form. So, the strength of the illusory effect changed in different ways for the 3D configurations of studied illusions.