 Because sometimes the same anatomical brain regions are involved in different ways in neural activity associated with the four categories of needs, implicated brain regions will be distinguished based on their dominance in related processes, and based on the chronological maturation of the dominant regions.Because according to the SPQL theory an individual's motivations ensue from the idiosyncratic cluster of the four categories of needs, these four categories are proposed to compound an individual's motivational framework (MF).In the following discussion, disparate preferences and needs will be referred to as motivational units (MU).