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Mutual influences between numerical and non-numerical quantities in comparison tasks.

Charlotte Hendryckx1,2, Mathieu Guillaume1, Anthony Beuel1

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Adults flexibly use visual cues like area and shape to judge quantities, demonstrating deliberate choices in numerical comparison tasks rather than automatic processing.

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Area of Science:

  • Cognitive Psychology
  • Numerical Cognition
  • Visual Perception

Background:

  • Humans have an innate ability to estimate large, non-symbolic quantities.
  • Performance in numerical comparison tasks is influenced by non-numerical features, but the exact mechanisms are unclear.

Purpose of the Study:

  • To investigate the interaction between numerical and non-numerical quantity judgments.
  • To determine how non-numerical dimensions influence performance in comparison tasks.

Main Methods:

  • Adult participants completed five distinct comparison tasks targeting numerosity, total area, dot size, convex hull, and mean occupancy.
  • The relationship between target and non-target dimensions was manipulated to assess their influence on task performance.

Main Results:

  • Total area and convex hull significantly impacted numerosity comparisons.
  • The number of dots served as a key cue for decisions based on total area or convex hull.
  • Adults demonstrated flexible use of non-target dimensions as visual cues.

Conclusions:

  • The influence of non-numerical features in numerical comparison tasks is explicit and deliberate.
  • This suggests conscious strategy use rather than automatic visual integration.