String Test (01:45)
Black and white footage shows a baby next to a chimpanzee with a man, and they all walk holding hands. The video shows the results of the baby and the chimpanzee through various tests involving a string. The baby and chimpanzee successfully take the string off their wrists and ankles.
Sound Test (03:10)
Researchers put a cloth bag over the baby’s head and see if the baby walks toward the sound of a woman’s voice. The man and woman tie the hands of the chimpanzee together and put a bag over its head to see if the chimpanzee walks toward the sound of the man’s voice. The baby walks toward the woman’s voice, and the chimpanzee walks toward the sound of the man’s voice.
Chair and Cookie Test (02:10)
Researchers put a cookie on a string above the height of the baby and the chimpanzee, and place a chair in the room. The baby and chimpanzee pull and push the chair, place it under the cookie, grab the cookie, and eat it. It takes the chimpanzee more attempts because it underestimates the distance to the cookie.
Tool and Treat Test (03:02)
A researcher places a hoe on the floor, and throws a treat under a door directly in front of the hoe to see if the baby and chimpanzee will use the tool to obtain the treat. Then the man throws the treat to the side of the hoe to see if the baby or chimpanzee will retrieve the treat, but neither can do it until after 300 trials.
Credits: Comparative Tests on a Human and a Chimpanzee Infant of Approximately the Same Age (00:14)
Credits: Comparative Tests on a Human and a Chimpanzee Infant of Approximately the Same Age
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