Thanks for sharing that left-brain myth especially from a former psychology student! Now I know why psychologists I’ve talked to are so opposed to that idea since this paper came out in 2013. It doesn’t say that it’s a myth, but simply says that it’s not defining our personality but more about tendency, precisely like what you explained about “working harder”. Quoted from the scientific paper: “left-dominant connections associated with language and perception of internal stimuli, and right-dominant connections associated with attention to external stimuli.” It’s the reason why left-brain-stroke patients lost language ability (e.g. Dr. Jill Bolte Taylor’s TED talk, or more from a neuroscientist’s website).

Similarly, they are opposed of MBTI tests derived from Jung’s tendencies not personality types. What’s been criticized about its scientific value is what Myers-Briggs did to validate it as a personality typing test, but psychologists warned “lay people” that it’s bogus, etc. I’ve yet advised friends to keep using such tests to understand our tendencies and embrace the fact that repeat tests resulting in different results are actually more inspiring than invalidating.

Those over-reliance on “what is scientific” is in fact what makes me promote more unscientific stuff (because oftentimes they’re not unscientific but simply unexplainable by science yet). I’m with you in our collective need to make conscious effort to stay rooted in the myths that make us human.