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The experiment was conducted at the Yerkes National primate Research center in 1930. A female chimpanzee named Gua was born and later removed from her mother for the experiment and was raised by researchers, Luella and Winthrop kellogg while also raising their son. Winthrop devised if he could raise a chimp with Donald their son, like siblings, he could then see the nature differences.

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The chimpanzee wouldn't be a pet but treated in the same way as the human child. They would be fed by bottle, bathed, clothed, and handled together. It would be induced to walk upright the same as a child and would be corrected in its mistakes like a human as well. The chimpanzee would also be taught and encouraged to eat with a spoon and to play like a child with children's toys. The primate would not be allowed to learn in any other way than the human way, thus allowing the experiment a chance to succeed in creating a human acting chimp.

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The chimp was showing a much quicker level of development as Donald for the age. She had mastered opening doors, especially swinging door, a month before Donald. At the age of one year, she had figured out that light switches controlled the electric light bulbs.

Another test was devised where reward was placed behind a wire mesh attached to a door frame. The only way to get the reward is via the use of a hoe to drag it under a small gap under the mesh. Both figured out out the solution at around 100 attempts, Gua proved to be more consistent in her success rate.

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Kellogg Experiment, was a well-known study conducted in the early 1930s where a chimpanzee named Gua was raised alongside the Winthrop's son, Donald. The experiment aimed to understand the impact of environmental factors on the development of behaviour of a chimpanzee and a human child in the same household.

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Discovery Institute’s Center for Science and Culture

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When a Child and a Chimp Were Raised Together | Evolution News and Science Today

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When their son was ten months old, a psychologist couple decided to raise him alongside a baby female chimpanzee, for research purposes.

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From the results of the experiments, Gua showed surprising intelligence and learning abilities, often exceeding Donald in certain areas like using utensils or responding to commands and only lagged behind Donald in language development.

The chimp's ability to learn and develop in human environment showed that apes are capable of a surprising amount of learning and adaptation. However, the experiment also revealed that inherent physical and cognitive differences between humans and apes prevent them from fully replicating human behavior.

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The Dark side of Science: The Horror of the Ape and The Child Experiment 1932 (Short Documentary)

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Donald's apparent social and vocal issues has caused concerns and the experiment was aprubtly brought to an end after 9 months.

Winthrop's results showed that he was disappointed that Gua had hit a wall of development. He hoped that immersing the ape into the human household would have created the reverse of a wild raised by wolves child. It's undeniable that Gua did developed many human like behaviours such as walking more upright, being relatively potty trained, understanding a multitude of commands and even showing off her problem solving skills.

Ultimately Gua was limited by the fact that she was a chimpanzee, and that her heredity limited her ultimate ability of language.

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Gua language development differed to that of a human child, in a sense that she would communicate her wants physically like pointing her mouth for food. The vocal communication Gua achieved was limited to grunts. This is where Donald exceeded as almost from the start of the experiment he was attempting to vocalise his emotions and needs. This would develope into vocalising actual words, a feat Gua failed to reach.

He was only in possession of around 6 words, but he did show signs of vocal imitation, although not from his human carers, but instead from his chimpanzee sister. The child would screech and scream like an ape.

Gua although not learning to speak words herself, did learn the words spoken to her and began to show signs of being able to differentiate between different commands, Her word reaction vocabulary eventually expanded to around 95 words.