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Object sorting into a two-dimensional array in humans and chimpanzees.

Misato Hayashi1,2, Hideko Takeshita3

  • 1Section of Language and Intelligence, Primate Research Institute, Kyoto University, 41 Kanrin, Inuyama, Aichi, 484-8506, Japan. misato.hayashi@j-monkey.jp.

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Summary
This summary is machine-generated.

Cognitive development in young children and chimpanzees shows similarities in object sorting tasks. Both species utilize basic categorical sorting rules, with humans demonstrating a shift to more complex strategies with age.

Keywords:
CategorizationChimpanzeesComparative cognitive developmentObject sorting

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Area of Science:

  • Comparative psychology
  • Developmental psychology
  • Cognitive science

Background:

  • Object-sorting tasks are established measures for assessing human cognitive development.
  • Comparative studies are crucial for understanding the evolutionary basis of cognition.

Purpose of the Study:

  • To investigate cognitive development comparatively using an object-sorting task.
  • To compare the object-sorting strategies of juvenile/adolescent chimpanzees and young children.

Main Methods:

  • A longitudinal, face-to-face object-sorting task was administered.
  • Participants included three juvenile/adolescent chimpanzees (7-9 years) and 17 children (2-5 years).
  • Subjects sorted nine blocks varying in color and shape into a 3x3 grid.

Main Results:

  • Chimpanzees exhibited categorical sorting in 24-43% of trials.
  • Children under 2 struggled to complete trials; older children established one-to-one correspondence but initially with random patterns.
  • Categorical sorting increased in children, peaking at age 4, after which they adopted more complex configurations (Latin squares).
  • Both chimpanzees and older children used color and shape cues, while younger children favored shape.

Conclusions:

  • Fundamental similarities exist in basic categorical sorting between humans and chimpanzees.
  • Autonomous rules appear to govern object manipulation and sorting in both species.
  • Human cognitive development involves a progression from basic categorical sorting to more complex strategies.