The Case for Observable, Environmental Approaches
I would also add that mentalistic approaches to Psychology have often led to the assertion of ambiguous hypotheses (e.g. https://onlinelibrary.wiley.com/doi/pdf/10.1002/icd.2295).
When you are studying unobservable faculties that you don’t understand and can barely describe, it is much harder to use precise language when designing experiments.
I would also add that mentalistic approaches to Psychology have often led to the assertion of ambiguous hypotheses (e.g. https://onlinelibrary.wiley.com/doi/pdf/10.1002/icd.2295).
When you are studying unobservable faculties that you don’t understand and can barely describe, it is much harder to use precise language when designing experiments.