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Case Study

Explain how combining single-subject animal studies and group infant studies supports the conclusion that innate number sense is an evolutionary foundation for advanced mathematical abilities, rather than a recently acquired human trait.

Case context: A developmental psychologist is examining how integrating different methodological approaches can clarify the origins of cognitive abilities. They review research on 'innate number sense' that combines findings from single-subject research with rats and birds and group research with human infants, both of which show strikingly similar abilities to discriminate small numbers of objects and events.

Question: Explain how combining single-subject animal studies and group infant studies supports the conclusion that innate number sense is an evolutionary foundation for advanced mathematical abilities, rather than a recently acquired human trait.

Sample answer: Integrating single-subject studies of animals (rats and birds) with group studies of human infants shows that strikingly similar number discrimination abilities exist across different species and developmental stages before formal education. Because these similar abilities are shared between humans and non-human animals, it suggests that this number sense evolved long before humans did, thereby serving as an evolutionary, biological foundation upon which advanced human mathematical skills are built.

Key points:

  • Similar number discrimination abilities are demonstrated in both animals and human infants.
  • The cross-species evidence indicates that the ability evolved long before humans.
  • This shared evolutionary trait is hypothesized to be the foundation for advanced mathematical skills.

Rubric: The explanation must convey that demonstrating similar quantity discrimination in both animals and human infants indicates the trait is shared across species and is pre-verbal/pre-educational. This cross-species commonality supports the idea that the trait has deep evolutionary roots (evolving long before humans) and acts as the foundation for later advanced math skills.

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Updated 2026-05-27

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Research Methods in Psychology - 4th American Edition @ KPU

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