"New situations requiring closer contact with the rabbit had been gradually introduced and the degree to which these situations were avoided, tolerated, or welcomed, at each experimental session, gave the measure of improvement."

"Peter was 2 years and 10 months old when we began to study him. He was afraid of a white rat, and this fear extended to a rabbit, a fur coat, a feather, cotton wool, etc., but not to wooden blocks and similar toys."

"From the test situations which were used to reveal fears, it was found that Peter showed even more marked fear responses to the rabbit than to the rat."

"Peter's fear of the animals which were shown him was probably not a directly conditioned fear."