Final answer:
Behavioristic psychologists believe that environmental factors and learned behaviors are the key drivers of human motivation, which stands in contrast to the humanistic perspective that emphasizes personal choice and innate potential for good.
Step-by-step explanation:
Behavioristic psychologists, such as B.F. Skinner, view the environment, rather than the personal subjective world, as the most powerful source of human motivation. They consider personality to be shaped significantly by external reinforcements and consequences, rather than by inborn characteristics or biological determinism. This perspective is deterministic, seeing behavior as a result of environmental influences and prior learning. In contrast, humanistic psychologists like Abraham Maslow and Carl Rogers argue for the role of personal choice, intentionality, and the inherent potential for good in human motivation.
They promote the ideas of free will, self-determination, self-actualization, and the importance of personal growth and fulfillment. Therefore, the statement that behavioristic psychologists believe that the personal subjective world is the most powerful source of human motivation is false.