Lorenz studied about imprinting and its importance on the later development of dogs. Imprinting is different than conditioning. Imprinting occurs early in life, takes place very rapidly, and has lifelong results. The last phase is enrichment. Unlike the first two, it has no limited window of opportunity.
Enrichment means the positive sum of experiences that have a cumulative effect upon the individual.
Enrichment is why one person can track a dog everyday, but do it improperly, not knowing where they layed their track, unmarked corners, inconsistentcy overall. While another person might track twice a week, but do it all correctly, take their time and make every step deliberate. The dog tracking twice a week will build up a positive sum of experiences, while the first dog will have too many grey areas and his percentage of positive experiences will get lost in the whole mess. Studies of John Paul Scott and John L. Fuller showed pups that received less stimulation would typically be fearful of unfamiliar objects and generally preferred to withdraw rather than investigate. Even well-bred pups of superior pedigrees would not explore or leave their kennels, and were difficult to train as adults.