Whatever the theory is it is supported by subjects. Different, even competing, theories, get supporting data. Structuralism s failure continued to make it hard to distinguish good psychology from bad ideas. This led to the emergence of Gestalt psychology in Europe. Rejects the notion that sub-thoughts matter.
Total experience is what matters.
So, if you see green, that is what matters . The individual total experience of seeing green, not how it is combined in the head. Behaviorism denied the importance of the mind. The emphasis was on objective stimuli and responses . We can t get at what s in the head.