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Topology-defined units in numerosity perception.

Lixia He1, Ke Zhou2, Tiangang Zhou1

  • 1State Key Laboratory of Brain and Cognitive Science, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China.

Proceedings of the National Academy of Sciences of the United States of America
|September 30, 2015
PubMed
Summary
This summary is machine-generated.

Numerosity perception is influenced by how items are visually grouped. Connected or enclosed items lead to underestimation of quantity, suggesting topology impacts number sense.

Keywords:
functional MRI adaptationglobal-first topological perceptionnumbernumerosity perceptiontopological invariants

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Area of Science:

  • Cognitive Science
  • Neuroscience
  • Visual Perception

Background:

  • The number sense hypothesis posits numerosity as a fundamental visual property.
  • The precise visual attributes defining numerosity perception remain unclear.
  • Investigating invariant features of numerosity perception is crucial.

Purpose of the Study:

  • To determine if topological features influence numerosity perception.
  • To examine the role of connectivity and enclosure in quantity judgments.
  • To explore the neural basis of topology-influenced numerosity.

Main Methods:

  • Behavioral experiments involving discrimination, estimation, and equality judgments.
  • Manipulation of item connectivity and enclosure while controlling for low-level visual features.
  • Functional Magnetic Resonance Imaging (fMRI) adaptation to measure neural tuning curves.

Main Results:

  • Connecting or enclosing items caused significant numerosity underestimation.
  • The degree of underestimation increased with the number of connected/enclosed items.
  • Grouping by color similarity did not affect numerosity judgments.
  • Neural representations of numerosity in the intraparietal sulcus were modulated by topological properties.

Conclusions:

  • Topological invariants like connectivity and inside/outside relationships influence numerosity perception.
  • Primitive units in numerosity are not solely based on low-level features.
  • The intraparietal sulcus encodes quantity in a manner sensitive to topological structure.