Sensorial thresholds as measured in a conventional psychophysical experimental set-up have been compared to those measured under conditions when discrimination becomes a part of a more complex thinking task. It is shown that in the first situation the process fully corresponds to predictions based on the present-day psychophysical theory, while in the second one there oc-cures a re-organization of the structure of mental processes in such a way that senses become directly connected with higher cognitive levels.