Yes. I am not referring to Psychogenic crap.
A small demonstration:
Take a handful of Orgahs and place them in a chain, cuff them and have them run in a straight line blindfolded.
Some run faster, some stumble, some are left-footed, others are right-footed.
But you'll witness a motion.

Double the number of Orgahs and the movement will be smoother.Get all Orgahs in a massive chain and they'll produce no deviation.
All individual qualities will be obliterated by social dynamics encouraged by certain stimulus that affect not the boy/girl, but the group itself.
Such subconscious factors are unaccounted for by normal psychiatry and psychology and you cannot understand them by individual observation, but by mathematical equations and statistical deviations.
The tree helps you understand a tree, but you cannot grasp a forest by cataloging individual trees.
Such is the story with Psychohistory vs. Psychology.
You can't apply Psychology to masses because of chaos theory which ruins your conclusions, like you cannot apply Psychohistory to an individual because the variables are too few.