Estimation of Line Orientation Depends on the Set of Additional Images

Abstract

The orientation of the lines, to which additional inclined lines could adjoin, was estimated. We have found a distortion in estimation of lines orientation by 1—2° (tilt illusion) when additional lines were presented, depending on a set of additional lines. For different observers, in the case of the presence of additional lines with a difference in orientation between the lines of up to 12°, both the effect of attraction (the lines seemed to be turned towards the additional) and the effect of repulsion could be detected. With a larger difference, only the repulsive effect is revealed. The discrepancy in the dependences can be explained by the difference in the visual acuity of observers associated with the size of the smallest receptive fields of striatal cortex neurons