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A great deal peer reveived scientific evidence exists concerning imprinting in chickens.  Most is in German. That interaction with the momma hen and only her is a function of imprinting.  We have been raising chickens too much like pet rocks ignoring the complexities of their social repetoire.
I am also a zoologist trained in animal behavior so having a level of expertise.
Yes I do agree that the Momma hen and the chicks to imprint, the hen is much more involved in the rearing of the chicks, finding food and water, providing a safe and warm enviroment under wing, foraging and fight & flight instincts no question there.
I am questioning the human imprint element, it's just not happening as much as the dotting OCDer's like to think it does. I have raised chickens that are happier/healthier without people always jacking with them and handling trying to make them into a lap pet.
Now I see where you are coming from.  The brooder reared with occasional and disruptive handling does dominate the backyard scene.  Birds are frightened and avoid handling.  I was speaking in terms of capacities for imprinting (on humans) which is a reality for  much of my efforts but likely rarely realized with most rearing efforts.  In those instances, the bonding is with the brooder unit itself and between chicks.  I use that to direct changes in roost location from on ground in chicken tractor to elevated roost in pasture.  They treat box like hen.
Although I have read numerous threads where imprinting to yeild lap chickens was realized.