from Subpart II.1 - Infancy: The Roots of Human Thinking
Published online by Cambridge University Press: 24 February 2022
The comparative psychology of human and nonhuman primates’ cognition, communication, language and morality is a prime area of study for understanding not only the roots of these abilities in our cousins, but also their place in human evolution. The groundbreaking work in this area was undertaken by Yerkes (1916) and Koehler (1925). Both scientists studied the mental life of apes. Using ingenious apparatus and procedures, such as the multiple-choice experiment, Yerkes investigated what Piaget was later to call object permanence. He also invented the stacking experiment (a suspended banana can only be reached if two or more boxes are stacked one on top of another), which was subsequently popularized by Koehler’s famous studies of problem-solving abilities in chimpanzees.
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