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Gestalt principles influence how students interpret evolutionary relationships in trees. Visual grouping, not just common ancestry, affects student understanding of cladograms.

Keywords:
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Area of Science:

  • Evolutionary biology
  • Cognitive psychology
  • Science education

Background:

  • Evolutionary relationships are depicted in trees based on common ancestry.
  • Perceptual/cognitive psychology suggests visual grouping principles may influence interpretation.

Purpose of the Study:

  • To investigate if Gestalt principles affect students' interpretation of evolutionary relationships in cladograms.
  • To determine how visual grouping impacts understanding of phylogenetic trees.

Main Methods:

  • Three experiments were conducted with undergraduate biology students (N=93, 310, 99).
  • Participants interpreted evolutionary trees, and their segmentation and inference patterns were analyzed.
  • The study examined the influence of the Gestalt principle of connectedness and visual grouping on interpretation.

Main Results:

  • Students segmented trees based on the Gestalt principle of connectedness.
  • A majority of students incorrectly believed differing visual groupings implied different evolutionary relationships.
  • Students' inferences aligned with depicted relationships when Gestalt grouping was supportive.

Conclusions:

  • Gestalt principles significantly impact students' interpretation of evolutionary relationships in cladograms.
  • Visual grouping can override accurate interpretation based on common ancestry.
  • Implications for improving science education and cladogram comprehension are discussed.