It is an interesting angle.
Of course we have the story of Samson losing his strength when his hair is cut.
Chinese Royal guards apparently grew their hair long for these reasons.
Many believe hair catches the spiritual power coming out of the crown chakra (Wizard hats and Yiddish skull caps have the same theory behind
them, along with Turbans and dunce caps etc...).
Strange though that Buddhist and Christian and Eygptian monks shaved their heads for the connectedness idea.
It may be physiological or psychological though. Good post, I wish there were a more definative answer.