Interaction of information levels of perception can influence the effectiveness of solving many practical problems, including politics, economy, medicine, etc. Therefore, this is a problem, or the problem situation, which includes episodes of human activity occurring with both optimal and unjustified costs. The purpose of this article is the identification and analysis of the practical effects and associated phenomena which arise from the problem. To achieve this, in accordance with the individual capacity of information channels to produce consciousness responses of different intensity their hierarchy was built: taste, touch, smell, hearing, sight, natural human language, graphic language, the language of numbers, the language of concepts and the language of empty words (sight and natural human language are border channels connecting the semiotic and sensory types of perception). The interaction between the levels of the hierarchy may initiate the increasing and interference effects as well as their attendant phenomena. The increasing effect is accompanied by improvement of professional skills, emergence of excess skill, mistaken assessment of the process. The phenomenon of improving professional skills detects itself in examples of people who manage complex processes because of the semiotic and sensory contact with the object of perception. In these cases, sensory perception enhances the effects of the semiotic one. The phenomenon of excess skills arises with the faster growth of professional skills in comparison with the increasing complexity of tasks. Being closely associated with the improvement of skills, this phenomenon may cover both humans and animals. Excess skill often becomes a source of negative stress, which can be eliminated by irrational complex tasks, which imply getting the desired result at highest, not smallest, costs. Associated with the two phenomena mistaken assessment of the process covers a wide range of professionals who do not perceive their tasks as complex ones and invite untrained people to solve them, thus provoking by adverse situations. The interference effect arises from the competition between the levels. It removes the " unclear'' features of objects from the analysis and lowers the intellectual characteristics of the person. In the first case, the person may underestimate the factors or phenomena s/ he deals with by the lower levels of the hierarchy (language of empty words) unfairly focusing their attention on the events perceived by the upper levels. Errors caused by this phenomenon can be quite substantial and manifest in both economy and politics. Reduction of the intellectual characteristics of the person occurs because of the prolonged interference effect and can be observed on the example of psychiatrists who have worked with the mentally ill for decades and acquired similar features.