Final answer:
The description matches the principles of humanistic psychology, which values self-growth and self-determination as its core ideas and is represented by key figures like Abraham Maslow and Carl Rogers.
Step-by-step explanation:
The tendency toward subjective functioning, where the self is of the greatest importance, aligns with the principles of humanistic psychology. Humanistic psychology emerged as a response to the reductionist and deterministic views of behaviorism and psychoanalysis. Proponents such as Abraham Maslow and Carl Rogers emphasized personal growth, free will, and self-determination. Maslow is famous for his hierarchy of needs and the concept of self-actualization, which represents the ultimate human motivation to achieve one's full potential. Similarly, Rogers highlighted the importance of the self-concept, which can be viewed through the lens of his notions of the ideal self and the real self. Both Maslow and Rogers contributed significantly to our understanding of the self, underpinning the essence of humanistic psychology, which celebrates the innate potential for good in all humans.