In the beginning of the 70s, the benefits of animal presence for patients were discovered, which resulted in further research concerning the psychological aspects of contact between patients and all kinds of animals. Dolphins came into consideration, when Dr. Betsy Smith started a scientific research with dolphins and autistic children in Florida called “the dolphin project”. In 1978 the neuropsychologist and behavioral scientist Dr. David E. Nathanson started to examine the effects of Dolphins for handicapped children at “Ocean World”, Ft. Lauderdale ( Florida).
He developed a series of carefully controlled language experiments, using dolphins as teachers for children with Down syndrome. As it turned out, the presence of dolphins offered different benefits for the children in terms of processing information (for learning occurs more rapidly by an increase of sensory attention, especially for the mentally impaired). In 1988, Dr. Nathanson started a therapy program at the “ Dolphin Research Center” in Grassy Key, Florida, which he called “Dolphin Human Therapy” (DHT). Between 1989 and 1994 more than 500 children with special needs had the opportunity to join Dr. Nathansons program, that was later moved to Key Largo, Florida.