Your definition of imprinting is too specific and to a degree inaccurate.
Even waterfowl do not bond on first thing they see. Bonding process starts pre-hatch and is via auditory signals. Chickens have a broader window for induction of bonding. Visual appearance developes later as bonding signal and in most bird species it is not as important as sound.
The birds come to consider me as a conspecific and as a particular individual to be bonded with. They associate with me in preference to all others, human or fowl, whether food award is present or not.
Imprinting can also be directed towards inanimate objects as indicated previously.
Training is where specific behaviors can be elicited without some sort of bond existing between subject animal and stimuli source. I use that later to get desired performances under a broader range of conditions.
Yes my question IS specific...I certainly MEANT it to be speccific toward humans by chickens. Geese are known "imprinters" and will imprint i believe the first living animal as their leader if the mother is not present. At least this is what i've always been told, read, and have seen. My fathers emus always imprinted him and the one dog, would be with them no matter where. Whereas the adults would not go near him until they had been exposed to him for a long time, I have read both that chickens do imprint and then of course i've read that they dont as they are not a social animal. I disagree to them not being social as almost everyone on this forum knows, but the imprinting, I tend to believe that they do not imprint at hatching.
Imprint learning occurs in animals that have a genetic predisposition for certain cues to initiate learning and instinctual behaviors. A classic example is a hatchling bird that identifies the first organism it sees as its mother. It will observe, follow and mimic the behaviors of its perceived "mother" whether the adopted mentor is its actual mother or not.