The dog [in Pavlov's experiments] does not continue to salivate whenever it hears a bell unless sometimes at least an edible offering accompanies the bell. But there are innumerable instances in human life where a single association, never reinforced, results in the establishment of a life-long dynamic system. An experience associated only once with a bereavement, an accident, or a battle, may become the center of a permanent phobia or complex, not in the least dependent on a recurrence of the original shock.
"A Psychological Interpretation". Book by Gordon Allport, p. 199, 1938.
![The dog [in Pavlov's experiments] does not continue to salivate whenever it hears a bell unless sometimes at least an edible offering accompanies the bell. But there are innumerable instances in human life where a](http://cdn.quoteddaily.com/images/gordon-allport/the-dog-in-pavlovs-experiments-does-not-continue-to-salivate-whenever-it-hears-a-bell-unless-sometimes-at-least-an.jpg)