Question

Your uncle john always argued, “stop studying mental events that cannot be directly observed!” which school of thought would most likely agree with your uncle john?

Answer 1

The school of thought that would most likely agree with uncle John is behaviorism.
Behaviorists believed that every type of action and behavior should be observed so as to be researched. If it cannot be directly observed, it doesn't require particular attention because it is not as relevant. Some famous behaviorists are Skinner, Watson, Pavlov, etc.