The psychological perspective that emerged in the 1950s and stressed free will, self-actualization, and human nature as naturally positive and growth seeking was the perspective.

humanistic              

Explanation:

Humanistic perspective: The humanistic perspective is being established with the work of Abraham Maslow, Otto Rank, Rollo May, and Carl Rogers. The humanistic perspective focuses on the empathy, personal worth of an individual, self-efficacy, free will, self-actualization, active and creative human nature, the centrality of human values, self-image, etc.

Instead of focusing on an individual's dysfunction, the humanistic perspective focuses on helping the person to fulfill his or her full potential and maximize his or her well-being.

In the question above, the given statement signifies the humanistic perspective.