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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Visual Perception

Background:

  • Humans can perceive and process numerical information across a wide range.
  • Existing models propose subitizing (up to four items) and estimation (larger quantities) for numerosity processing.

Purpose of the Study:

  • To provide further evidence for a third mechanism in numerosity processing.
  • To investigate the role of item density and segregability in number perception.

Main Methods:

  • Reaction time measurements were used to analyze numerosity perception.
  • Stimuli included varying numerosities and display densities.

Main Results:

  • Reaction times were fastest in the subitizing range (up to four items).
  • Reaction times increased for numerosities greater than four.
  • For very high numerosities in tightly packed displays, reaction times decreased, suggesting a 'texture' mechanism.

Conclusions:

  • Evidence supports three distinct regimes for numerosity processing: subitizing, estimation, and texture.
  • The 'texture' mechanism is engaged when items are densely packed and less segregable.
  • This expands our understanding of the human capacity for number encoding.