Picture-word interference (PWI) paradigm is widely used in cognitive science for studying selective attention and speech production. This experimental paradigm is a modification of the classical Stroop task. In PWI task participants perform speeded naming of pictures (targets) while ignoring superimposed word distractors. Pictures are usually named more quickly when the distractor is a word than a control stimulus - the interference effect is observed. The effect size depends on many factors including the target's subjective complexity. Leading theories of Stroop interference give mutually exclusive predictions concerning the influence of this factor on the magnitude of interference. According to the theories of competition, which consider the interference effect as a consequence of automatic processes, the complication of target images should lead to an increase in interference. The opposite prediction follows from the framework of control theories, which consider Stroop interference as a consequence of volu