Read “The Six Stages of a Failed Psychological Theory” at the link below.
It is the reason that the vast majority of us with real science degrees consider that profession to be a low level collection of hacks.
It is not even close to science.
Left/Right Brain is a prime example of a debunked theory that lives on. So is the Brain Chemical Imbalance theory. In fact just about everything they claim is hogwash. It’s all pseudoscience.