Seasonality and Personality
If you had read
"Babies' biological clocks dramatically affected by birth light cycle" where it says
"Seasonality and Personality
The new study raises an intriguing but highly speculative possibility: Seasonal variations in the day/night cycle that individuals experience as their brains are developing may affect their personality."
I had read the brief communication "Perinatal photoperiod imprints the circadian clock" and the word "personality" is not mentioned there.
I had also contacted Dr. McMahon to ask him if he could quantify / estimate the % of the contribution of "Seasonality" to personality development in humans.
He had answered: "In answer to your inquiry - It is not possible to quantify any possible effect in humans. This is an idea that still must be tested."