Final answer:
The Behaviorist learning perspective focuses on the environment as the primary source of learning, rather than internal cognitive processes.
Step-by-step explanation:
The perspective of learning that emphasizes the environment rather than human thought as the source of all learning is the Behaviorist learning perspective. Behaviorists, like B.F. Skinner, proposed that personality and behavior are shaped by external stimuli and that our actions are a result of the reinforcements and consequences we encounter in our environment. This approach contrasts with cognitive and other perspectives that consider internal thought processes as central to learning.