The problem of creative search motivation is discussed. The structure and dynamics of problem situation formation are investigated. The author considers it important to separate the stage of problem adoption from the decision proper. Such separation permits to differentiate corresponding motives. Mathematic-symbolic models of .motivational states mirroring dynamics and interaction of search motives are presented. Structural-functional model of the problem situation is substantiated. Factors influencing the energetics of intellectual activity motives and motivational causes for search cessation are analysed. The conclusion is made that it is expedient to view the problem situation as personal psychic state involving the person into creative search. This notion is preferable to traditional definition of the problem situation only as the result of cognitive difficulties. Some practical advices are presented.