When psychological functions and processes first became the object of concrete-scientific study (particularly experimental studies), investigators saw their main objective to be to determine the laws and characteristics of these processes in their pure form. Experimental methods were aimed at isolating a given function (perceptual, mnemonic, intellectual, etc.) as completely as possible from the system of other psychological phenomena and reducing to a minimum the influence of these other phenomena on the function under study, which was then investigated as a kind of unique natural property of the individual.